/in/foo.cc:5:0: warning: ignoring #pragma warning  [-Wunknown-pragmas]
 #pragma warning(disable:4996)
 
/in/foo.cc: In function 'int main()':
/in/foo.cc:12:17: error: 'itoa' was not declared in this scope
   itoa(sum,s1,10);
                 ^
/in/foo.cc:13:16: error: 'strlen' was not declared in this scope
   k = strlen(s1);
                ^
/in/foo.cc:21:11: warning: statement has no effect [-Wunused-value]
     for (t; s1[t+1]!='\0'; t++) 
           ^