View Compilation Error

0_0_31825675_17440.cpp: In function 'int main()':
0_0_31825675_17440.cpp:4:27: error: 'scanf' was not declared in this scope
  while(scanf("%d %d",&m,&n)!=EOF)
                           ^
0_0_31825675_17440.cpp:4:30: error: 'EOF' was not declared in this scope
  while(scanf("%d %d",&m,&n)!=EOF)
                              ^
0_0_31825675_17440.cpp:10:11: error: 'su' was not declared in this scope
    if(su(i))
           ^
0_0_31825675_17440.cpp:15:15: error: 'printf' was not declared in this scope
     printf(" ");
               ^
0_0_31825675_17440.cpp:17:18: error: 'printf' was not declared in this scope
     printf("%d",i);
                  ^
0_0_31825675_17440.cpp:23:15: error: 'printf' was not declared in this scope
    printf("no");
               ^
0_0_31825675_17440.cpp:25:14: error: 'printf' was not declared in this scope
   printf("\n");
              ^