Scanner X25570

Statement

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INTRODUCCIÓ:

En aquest exercici considerarem un llenguatge de programació amb expressións i instruccions. Les expressions són sobre els operadors +,-,*, i sobre operands naturals i variables enteres. Hi ha dos tipus d’instruccions:

Instrucció d’assignació x = e, on x és una variable i e és una expressió. Per exemple x=3+4*y.
Instrucció d’escriure per la sortida estandard Print(e), on e és una expressió. Per exemple Print(3+4*y).

Cada instrucció apareix en una nova línia. Aquí tenim un exemple de programa:

x = 3
y=3+x
z=2 * (x+y)
Print(z - y+x)

El nostre objectiu serà escanejar cada línia, identificar els elements bàsics que hi apareixen i retornar una llista amb aquests elements. Per exemple, donat l’string "z=2 * (x+y)", haurem de produïr la llista de parelles d’strings:

<"variable","z">, <"operator","=">, <"number", "2">, <"operator","*">, <"marker","(">,
<"variable","x">, <"operator","+">, <"variable","y">, <"marker",")">

EXERCICI:

Implementeu una funció que, donat un string line amb una instrucció en el nostre llenguatge de programació, retorna un list<pair<string,string> > que representa la seqüència d’elements atòmics del llenguatge que hi apareixen. Aquesta és la capcelera:

// Pre:  "line" conté una instrucció correcta del llenguatge.
// Post: retorna la llista d'elements atòmics del llenguatge que apareixen a "line".
list<pair<string,string> > scanner(string line);

Fixeu-vos que l’enunciat d’aquest exercici ja ofereix uns fitxers que haureu d’utilitzar per a compilar: Makefile, program.cpp, scanner.hpp, utils.hpp, utils.cpp. Us falta crear el fitxer scanner.cpp amb els corresponents includes i implementar-hi la funció scanner que hem explicat. Valdrà la pena que utilitzeu algunes de les funcions oferides a utils.hpp. Quan pugeu la vostra solució al jutge, només cal que pugeu un tar construït així:

tar cf solution.tar scanner.cpp

Entrada

L’entrada té una seqüència de linies, on cadascuna és una instrucció del llenguatge. Fixeu-vos en que el programa que us oferim ja s’encarrega de llegir aquesta entrada. Només cal que implementeu la funció abans esmentada.

Sortida

El programa dona com a sortida, per a cada linia, la llista d’elements atòmics que hi apareixen. Fixeu-vos en que el programa que us oferim ja s’encarrega d’escriure aquesta sortida. Només cal que implementeu la funció abans esmentada.

Public test cases

Input

a=3*2+1
Print(a-(7-a)-(2*a))
a=a+6-3
Print(a-(3*a))
b=a*a-(a*2)
Print(4*a)
Print(b-(2-4))
Print(3*b)
b=7-4-(a*4)
Print(a+3-b+(7-3))

Output

<"variable","a"> <"operator","="> <"number","3"> <"operator","*"> <"number","2"> <"operator","+"> <"number","1">
<"function","Print"> <"marker","("> <"variable","a"> <"operator","-"> <"marker","("> <"number","7"> <"operator","-"> <"variable","a"> <"marker",")"> <"operator","-"> <"marker","("> <"number","2"> <"operator","*"> <"variable","a"> <"marker",")"> <"marker",")">
<"variable","a"> <"operator","="> <"variable","a"> <"operator","+"> <"number","6"> <"operator","-"> <"number","3">
<"function","Print"> <"marker","("> <"variable","a"> <"operator","-"> <"marker","("> <"number","3"> <"operator","*"> <"variable","a"> <"marker",")"> <"marker",")">
<"variable","b"> <"operator","="> <"variable","a"> <"operator","*"> <"variable","a"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","*"> <"number","2"> <"marker",")">
<"function","Print"> <"marker","("> <"number","4"> <"operator","*"> <"variable","a"> <"marker",")">
<"function","Print"> <"marker","("> <"variable","b"> <"operator","-"> <"marker","("> <"number","2"> <"operator","-"> <"number","4"> <"marker",")"> <"marker",")">
<"function","Print"> <"marker","("> <"number","3"> <"operator","*"> <"variable","b"> <"marker",")">
<"variable","b"> <"operator","="> <"number","7"> <"operator","-"> <"number","4"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","*"> <"number","4"> <"marker",")">
<"function","Print"> <"marker","("> <"variable","a"> <"operator","+"> <"number","3"> <"operator","-"> <"variable","b"> <"operator","+"> <"marker","("> <"number","7"> <"operator","-"> <"number","3"> <"marker",")"> <"marker",")">

Input

a=3*2+1
Print(a-(7-a)-(2*a))
a=a+6-3
Print(a-(3*a))
b=a*a-(a*2)
Print(4*a)
Print(b-(2-4))
Print(3*b)
b=7-4-(a*4)
Print(a+3-b+(7-3))

Output

<"variable","a"> <"operator","="> <"number","3"> <"operator","*"> <"number","2"> <"operator","+"> <"number","1">
<"function","Print"> <"marker","("> <"variable","a"> <"operator","-"> <"marker","("> <"number","7"> <"operator","-"> <"variable","a"> <"marker",")"> <"operator","-"> <"marker","("> <"number","2"> <"operator","*"> <"variable","a"> <"marker",")"> <"marker",")">
<"variable","a"> <"operator","="> <"variable","a"> <"operator","+"> <"number","6"> <"operator","-"> <"number","3">
<"function","Print"> <"marker","("> <"variable","a"> <"operator","-"> <"marker","("> <"number","3"> <"operator","*"> <"variable","a"> <"marker",")"> <"marker",")">
<"variable","b"> <"operator","="> <"variable","a"> <"operator","*"> <"variable","a"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","*"> <"number","2"> <"marker",")">
<"function","Print"> <"marker","("> <"number","4"> <"operator","*"> <"variable","a"> <"marker",")">
<"function","Print"> <"marker","("> <"variable","b"> <"operator","-"> <"marker","("> <"number","2"> <"operator","-"> <"number","4"> <"marker",")"> <"marker",")">
<"function","Print"> <"marker","("> <"number","3"> <"operator","*"> <"variable","b"> <"marker",")">
<"variable","b"> <"operator","="> <"number","7"> <"operator","-"> <"number","4"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","*"> <"number","4"> <"marker",")">
<"function","Print"> <"marker","("> <"variable","a"> <"operator","+"> <"number","3"> <"operator","-"> <"variable","b"> <"operator","+"> <"marker","("> <"number","7"> <"operator","-"> <"number","3"> <"marker",")"> <"marker",")">

Input

Print(   4+7+(  6-8)-(8-2))
a=1-   1
Print((a-7*    a)*(a*1))
b=a+1
b=3
Print(8+(7-  2))
b=b-3
Print((b-2-b)*(6-(5-a)+ (a-3-(4+9))))
Print (  9)
Print((3* 9+4-9*(5-  a))    *(b-a*7))

Output

<"function","Print"> <"marker","("> <"number","4"> <"operator","+"> <"number","7"> <"operator","+"> <"marker","("> <"number","6"> <"operator","-"> <"number","8"> <"marker",")"> <"operator","-"> <"marker","("> <"number","8"> <"operator","-"> <"number","2"> <"marker",")"> <"marker",")">
<"variable","a"> <"operator","="> <"number","1"> <"operator","-"> <"number","1">
<"function","Print"> <"marker","("> <"marker","("> <"variable","a"> <"operator","-"> <"number","7"> <"operator","*"> <"variable","a"> <"marker",")"> <"operator","*"> <"marker","("> <"variable","a"> <"operator","*"> <"number","1"> <"marker",")"> <"marker",")">
<"variable","b"> <"operator","="> <"variable","a"> <"operator","+"> <"number","1">
<"variable","b"> <"operator","="> <"number","3">
<"function","Print"> <"marker","("> <"number","8"> <"operator","+"> <"marker","("> <"number","7"> <"operator","-"> <"number","2"> <"marker",")"> <"marker",")">
<"variable","b"> <"operator","="> <"variable","b"> <"operator","-"> <"number","3">
<"function","Print"> <"marker","("> <"marker","("> <"variable","b"> <"operator","-"> <"number","2"> <"operator","-"> <"variable","b"> <"marker",")"> <"operator","*"> <"marker","("> <"number","6"> <"operator","-"> <"marker","("> <"number","5"> <"operator","-"> <"variable","a"> <"marker",")"> <"operator","+"> <"marker","("> <"variable","a"> <"operator","-"> <"number","3"> <"operator","-"> <"marker","("> <"number","4"> <"operator","+"> <"number","9"> <"marker",")"> <"marker",")"> <"marker",")"> <"marker",")">
<"function","Print"> <"marker","("> <"number","9"> <"marker",")">
<"function","Print"> <"marker","("> <"marker","("> <"number","3"> <"operator","*"> <"number","9"> <"operator","+"> <"number","4"> <"operator","-"> <"number","9"> <"operator","*"> <"marker","("> <"number","5"> <"operator","-"> <"variable","a"> <"marker",")"> <"marker",")"> <"operator","*"> <"marker","("> <"variable","b"> <"operator","-"> <"variable","a"> <"operator","*"> <"number","7"> <"marker",")"> <"marker",")">

Input

Print(   4+7+(  6-8)-(8-2))
a=1-   1
Print((a-7*    a)*(a*1))
b=a+1
b=3
Print(8+(7-  2))
b=b-3
Print((b-2-b)*(6-(5-a)+ (a-3-(4+9))))
Print (  9)
Print((3* 9+4-9*(5-  a))    *(b-a*7))

Output

<"function","Print"> <"marker","("> <"number","4"> <"operator","+"> <"number","7"> <"operator","+"> <"marker","("> <"number","6"> <"operator","-"> <"number","8"> <"marker",")"> <"operator","-"> <"marker","("> <"number","8"> <"operator","-"> <"number","2"> <"marker",")"> <"marker",")">
<"variable","a"> <"operator","="> <"number","1"> <"operator","-"> <"number","1">
<"function","Print"> <"marker","("> <"marker","("> <"variable","a"> <"operator","-"> <"number","7"> <"operator","*"> <"variable","a"> <"marker",")"> <"operator","*"> <"marker","("> <"variable","a"> <"operator","*"> <"number","1"> <"marker",")"> <"marker",")">
<"variable","b"> <"operator","="> <"variable","a"> <"operator","+"> <"number","1">
<"variable","b"> <"operator","="> <"number","3">
<"function","Print"> <"marker","("> <"number","8"> <"operator","+"> <"marker","("> <"number","7"> <"operator","-"> <"number","2"> <"marker",")"> <"marker",")">
<"variable","b"> <"operator","="> <"variable","b"> <"operator","-"> <"number","3">
<"function","Print"> <"marker","("> <"marker","("> <"variable","b"> <"operator","-"> <"number","2"> <"operator","-"> <"variable","b"> <"marker",")"> <"operator","*"> <"marker","("> <"number","6"> <"operator","-"> <"marker","("> <"number","5"> <"operator","-"> <"variable","a"> <"marker",")"> <"operator","+"> <"marker","("> <"variable","a"> <"operator","-"> <"number","3"> <"operator","-"> <"marker","("> <"number","4"> <"operator","+"> <"number","9"> <"marker",")"> <"marker",")"> <"marker",")"> <"marker",")">
<"function","Print"> <"marker","("> <"number","9"> <"marker",")">
<"function","Print"> <"marker","("> <"marker","("> <"number","3"> <"operator","*"> <"number","9"> <"operator","+"> <"number","4"> <"operator","-"> <"number","9"> <"operator","*"> <"marker","("> <"number","5"> <"operator","-"> <"variable","a"> <"marker",")"> <"marker",")"> <"operator","*"> <"marker","("> <"variable","b"> <"operator","-"> <"variable","a"> <"operator","*"> <"number","7"> <"marker",")"> <"marker",")">

Input

    a=36*87+   50
b=63-  (a-a-(   43-a))-99-   (   27-81)
a=9+   (85-(100-a))
Print(2+   (41+b+    (b-b)-(  84+   25+4*71)))
  a=38-(75+59)-19*44-(44- (5*29-97*44))
a=a-21-27-83*25-(   a+(74+34*61-(b+    a+41*85)))
  a=(21-23)*   82-(a-(a-41)    )   
Print(a-85*43+    (a-a)   -  (b-a+(b+91)  -(b+97)*  (a-a))-   51+(98+(82+   39-40*16-   (b+44))))
Print(52+b) 
Print  (42*    34+39-85)    
Print( 8+b-b)
Print  (40+64-(32-83))
Print(82-(32+a)+(a- (a+ b+(b-51)  -(35-76-(94+    6)   -18)))   )
 b=b-   b
bb=b-a-a-80*(  73+35)    +(a+15+(a-55-87))
bb=21-b*(bb-bb-(10+a)   )
a=  bb*82-    (bb+26)*93
 bb=   b+86-a-(93-26*bb)- (26* 71-  9-(a-72-(a+89)))+(78+  58-18)
bb=63-  ( a-    16)-(92-38)
Print  (55*76-13+( 61-  15)*(84+b)    )

Output

<"variable","a"> <"operator","="> <"number","36"> <"operator","*"> <"number","87"> <"operator","+"> <"number","50">
<"variable","b"> <"operator","="> <"number","63"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","-"> <"variable","a"> <"operator","-"> <"marker","("> <"number","43"> <"operator","-"> <"variable","a"> <"marker",")"> <"marker",")"> <"operator","-"> <"number","99"> <"operator","-"> <"marker","("> <"number","27"> <"operator","-"> <"number","81"> <"marker",")">
<"variable","a"> <"operator","="> <"number","9"> <"operator","+"> <"marker","("> <"number","85"> <"operator","-"> <"marker","("> <"number","100"> <"operator","-"> <"variable","a"> <"marker",")"> <"marker",")">
<"function","Print"> <"marker","("> <"number","2"> <"operator","+"> <"marker","("> <"number","41"> <"operator","+"> <"variable","b"> <"operator","+"> <"marker","("> <"variable","b"> <"operator","-"> <"variable","b"> <"marker",")"> <"operator","-"> <"marker","("> <"number","84"> <"operator","+"> <"number","25"> <"operator","+"> <"number","4"> <"operator","*"> <"number","71"> <"marker",")"> <"marker",")"> <"marker",")">
<"variable","a"> <"operator","="> <"number","38"> <"operator","-"> <"marker","("> <"number","75"> <"operator","+"> <"number","59"> <"marker",")"> <"operator","-"> <"number","19"> <"operator","*"> <"number","44"> <"operator","-"> <"marker","("> <"number","44"> <"operator","-"> <"marker","("> <"number","5"> <"operator","*"> <"number","29"> <"operator","-"> <"number","97"> <"operator","*"> <"number","44"> <"marker",")"> <"marker",")">
<"variable","a"> <"operator","="> <"variable","a"> <"operator","-"> <"number","21"> <"operator","-"> <"number","27"> <"operator","-"> <"number","83"> <"operator","*"> <"number","25"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","+"> <"marker","("> <"number","74"> <"operator","+"> <"number","34"> <"operator","*"> <"number","61"> <"operator","-"> <"marker","("> <"variable","b"> <"operator","+"> <"variable","a"> <"operator","+"> <"number","41"> <"operator","*"> <"number","85"> <"marker",")"> <"marker",")"> <"marker",")">
<"variable","a"> <"operator","="> <"marker","("> <"number","21"> <"operator","-"> <"number","23"> <"marker",")"> <"operator","*"> <"number","82"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","-"> <"number","41"> <"marker",")"> <"marker",")">
<"function","Print"> <"marker","("> <"variable","a"> <"operator","-"> <"number","85"> <"operator","*"> <"number","43"> <"operator","+"> <"marker","("> <"variable","a"> <"operator","-"> <"variable","a"> <"marker",")"> <"operator","-"> <"marker","("> <"variable","b"> <"operator","-"> <"variable","a"> <"operator","+"> <"marker","("> <"variable","b"> <"operator","+"> <"number","91"> <"marker",")"> <"operator","-"> <"marker","("> <"variable","b"> <"operator","+"> <"number","97"> <"marker",")"> <"operator","*"> <"marker","("> <"variable","a"> <"operator","-"> <"variable","a"> <"marker",")"> <"marker",")"> <"operator","-"> <"number","51"> <"operator","+"> <"marker","("> <"number","98"> <"operator","+"> <"marker","("> <"number","82"> <"operator","+"> <"number","39"> <"operator","-"> <"number","40"> <"operator","*"> <"number","16"> <"operator","-"> <"marker","("> <"variable","b"> <"operator","+"> <"number","44"> <"marker",")"> <"marker",")"> <"marker",")"> <"marker",")">
<"function","Print"> <"marker","("> <"number","52"> <"operator","+"> <"variable","b"> <"marker",")">
<"function","Print"> <"marker","("> <"number","42"> <"operator","*"> <"number","34"> <"operator","+"> <"number","39"> <"operator","-"> <"number","85"> <"marker",")">
<"function","Print"> <"marker","("> <"number","8"> <"operator","+"> <"variable","b"> <"operator","-"> <"variable","b"> <"marker",")">
<"function","Print"> <"marker","("> <"number","40"> <"operator","+"> <"number","64"> <"operator","-"> <"marker","("> <"number","32"> <"operator","-"> <"number","83"> <"marker",")"> <"marker",")">
<"function","Print"> <"marker","("> <"number","82"> <"operator","-"> <"marker","("> <"number","32"> <"operator","+"> <"variable","a"> <"marker",")"> <"operator","+"> <"marker","("> <"variable","a"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","+"> <"variable","b"> <"operator","+"> <"marker","("> <"variable","b"> <"operator","-"> <"number","51"> <"marker",")"> <"operator","-"> <"marker","("> <"number","35"> <"operator","-"> <"number","76"> <"operator","-"> <"marker","("> <"number","94"> <"operator","+"> <"number","6"> <"marker",")"> <"operator","-"> <"number","18"> <"marker",")"> <"marker",")"> <"marker",")"> <"marker",")">
<"variable","b"> <"operator","="> <"variable","b"> <"operator","-"> <"variable","b">
<"variable","bb"> <"operator","="> <"variable","b"> <"operator","-"> <"variable","a"> <"operator","-"> <"variable","a"> <"operator","-"> <"number","80"> <"operator","*"> <"marker","("> <"number","73"> <"operator","+"> <"number","35"> <"marker",")"> <"operator","+"> <"marker","("> <"variable","a"> <"operator","+"> <"number","15"> <"operator","+"> <"marker","("> <"variable","a"> <"operator","-"> <"number","55"> <"operator","-"> <"number","87"> <"marker",")"> <"marker",")">
<"variable","bb"> <"operator","="> <"number","21"> <"operator","-"> <"variable","b"> <"operator","*"> <"marker","("> <"variable","bb"> <"operator","-"> <"variable","bb"> <"operator","-"> <"marker","("> <"number","10"> <"operator","+"> <"variable","a"> <"marker",")"> <"marker",")">
<"variable","a"> <"operator","="> <"variable","bb"> <"operator","*"> <"number","82"> <"operator","-"> <"marker","("> <"variable","bb"> <"operator","+"> <"number","26"> <"marker",")"> <"operator","*"> <"number","93">
<"variable","bb"> <"operator","="> <"variable","b"> <"operator","+"> <"number","86"> <"operator","-"> <"variable","a"> <"operator","-"> <"marker","("> <"number","93"> <"operator","-"> <"number","26"> <"operator","*"> <"variable","bb"> <"marker",")"> <"operator","-"> <"marker","("> <"number","26"> <"operator","*"> <"number","71"> <"operator","-"> <"number","9"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","-"> <"number","72"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","+"> <"number","89"> <"marker",")"> <"marker",")"> <"marker",")"> <"operator","+"> <"marker","("> <"number","78"> <"operator","+"> <"number","58"> <"operator","-"> <"number","18"> <"marker",")">
<"variable","bb"> <"operator","="> <"number","63"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","-"> <"number","16"> <"marker",")"> <"operator","-"> <"marker","("> <"number","92"> <"operator","-"> <"number","38"> <"marker",")">
<"function","Print"> <"marker","("> <"number","55"> <"operator","*"> <"number","76"> <"operator","-"> <"number","13"> <"operator","+"> <"marker","("> <"number","61"> <"operator","-"> <"number","15"> <"marker",")"> <"operator","*"> <"marker","("> <"number","84"> <"operator","+"> <"variable","b"> <"marker",")"> <"marker",")">

Input

    a=36*87+   50
b=63-  (a-a-(   43-a))-99-   (   27-81)
a=9+   (85-(100-a))
Print(2+   (41+b+    (b-b)-(  84+   25+4*71)))
  a=38-(75+59)-19*44-(44- (5*29-97*44))
a=a-21-27-83*25-(   a+(74+34*61-(b+    a+41*85)))
  a=(21-23)*   82-(a-(a-41)    )   
Print(a-85*43+    (a-a)   -  (b-a+(b+91)  -(b+97)*  (a-a))-   51+(98+(82+   39-40*16-   (b+44))))
Print(52+b) 
Print  (42*    34+39-85)    
Print( 8+b-b)
Print  (40+64-(32-83))
Print(82-(32+a)+(a- (a+ b+(b-51)  -(35-76-(94+    6)   -18)))   )
 b=b-   b
bb=b-a-a-80*(  73+35)    +(a+15+(a-55-87))
bb=21-b*(bb-bb-(10+a)   )
a=  bb*82-    (bb+26)*93
 bb=   b+86-a-(93-26*bb)- (26* 71-  9-(a-72-(a+89)))+(78+  58-18)
bb=63-  ( a-    16)-(92-38)
Print  (55*76-13+( 61-  15)*(84+b)    )

Output

<"variable","a"> <"operator","="> <"number","36"> <"operator","*"> <"number","87"> <"operator","+"> <"number","50">
<"variable","b"> <"operator","="> <"number","63"> <"operator","-"> <"marker","("> <"variable","a"> <"operator","-"> <"variable","a"> <"operator","-"> <"marker","("> <"number","43"> <"operator","-"> <"variable","a"> <"marker",")"> <"marker",")"> <"operator","-"> <"number","99"> <"operator","-"> <"marker","("> <"number","27"> <"operator","-"> <"number","81"> <"marker",")">
<"variable","a"> <"operator","="> <"number","9"> <"operator","+"> <"marker","("> <"number","85"> <"operator","-"> <"marker","("> <"number","100"> <"operator","-"> <"variable","a"> <"marker",")"> <"marker",")">
<"function","Print"> <"marker","("> <"number","2"> <"operator","+"> <"marker","("> <"number","41"> <"operator","+"> <"variable","b"> <"operator","+"> <"marker","("> <"variable","b"> <"operator","-"> <"variable","b"> <"marker",")"> <"operator","-"> <"marker","("> <"number","84"> <"operator","+"> <"number","25"> <"operator","+"> <"number","4"> <"operator","*"> <"number","71"> <"marker",")"> <"marker",")"> <"marker",")">
<"variable","a"> <"operator","="> <"number","38"> <"operator","-"> <"marker","("> <"number","75"> <"operator","+"> <"number","59"> <"marker",")"> <"operator","-"> <"number","19"> <"operator","*"> <"number","44"> <"operator","-"> <"marker","("> <"number","44"> <"operator","-"> <"marker","("> <"number","5"> <"operator","*"> <"number","29"> <"operator","-"> <"number","97"> <"operator","*"> <"number","44"> <"marker",")"> <"marker",")">
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Information

Author: PRO1
Language: Catalan
Official solutions: Make
User solutions: Make