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#include <stdio.h>
 
int main(void) 
{n,m,acarreo,c;
  scanf("%i %i", &n &m);
 if(a==0 && b==0)
  printf("");
 else 
  if
   while(0<a || 0<b)
     {l1 = a % 10;
      l2 = b % 10;
      suma = l1 + l2 + c;
 
      if(suma>=10)
      {acarreo++;
       c = 1;}
      else(acarreo==0)
      {printf("No carry operation.")}
      }
     n = n/10;
     m = m/10;
     }
 if(acarreo==0)
 {printf("No carry operation.");
 }
 if(acarreo>1)
 {printf("%i carry operations.");
 if(acarreo==1)
 {printf("1 carry operation.");
 
 
	return 0;
}

prog.c: In function ‘main’:
prog.c:4:2: error: ‘n’ undeclared (first use in this function)
 {n,m,acarreo,c;
  ^
prog.c:4:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c:4:4: error: ‘m’ undeclared (first use in this function)
 {n,m,acarreo,c;
    ^
prog.c:4:3: warning: left-hand operand of comma expression has no effect [-Wunused-value]
 {n,m,acarreo,c;
   ^
prog.c:4:6: error: ‘acarreo’ undeclared (first use in this function)
 {n,m,acarreo,c;
      ^~~~~~~
prog.c:4:5: warning: left-hand operand of comma expression has no effect [-Wunused-value]
 {n,m,acarreo,c;
     ^
prog.c:4:14: error: ‘c’ undeclared (first use in this function)
 {n,m,acarreo,c;
              ^
prog.c:4:13: warning: left-hand operand of comma expression has no effect [-Wunused-value]
 {n,m,acarreo,c;
             ^
prog.c:6:5: error: ‘a’ undeclared (first use in this function)
  if(a==0 && b==0)
     ^
prog.c:6:13: error: ‘b’ undeclared (first use in this function)
  if(a==0 && b==0)
             ^
prog.c:7:10: warning: zero-length gnu_printf format string [-Wformat-zero-length]
   printf("");
          ^~
prog.c:10:4: error: expected ‘(’ before ‘while’
    while(0<a || 0<b)
    ^~~~~
prog.c:11:7: error: ‘l1’ undeclared (first use in this function)
      {l1 = a % 10;
       ^~
prog.c:12:7: error: ‘l2’ undeclared (first use in this function)
       l2 = b % 10;
       ^~
prog.c:13:7: error: ‘suma’ undeclared (first use in this function)
       suma = l1 + l2 + c;
       ^~~~
prog.c:19:7: error: expected ‘;’ before ‘{’ token
       {printf("No carry operation.")}
       ^
prog.c: At top level:
prog.c:24:2: error: expected identifier or ‘(’ before ‘if’
  if(acarreo==0)
  ^~
prog.c:27:2: error: expected identifier or ‘(’ before ‘if’
  if(acarreo>1)
  ^~

Standard output is empty