View Compilation Error

0_0_24599961_31118.cpp: In function 'int main()':
0_0_24599961_31118.cpp:12:29: error: 'scanf' was not declared in this scope
     while(scanf("%d%d",&n,&m),n!=0){
                             ^
0_0_24599961_31118.cpp:27:26: error: 'printf' was not declared in this scope
             printf("NO\n");
                          ^
0_0_24599961_31118.cpp:70:27: error: 'printf' was not declared in this scope
             printf("YES\n");
                           ^
0_0_24599961_31118.cpp:72:26: error: 'printf' was not declared in this scope
             printf("NO\n");
                          ^