View Compilation Error

0_0_23709606_5830.cpp: In function 'int main()':
0_0_23709606_5830.cpp:4:25: error: 'scanf' was not declared in this scope
     while(~scanf("%d",&t))  
                         ^
0_0_23709606_5830.cpp:8:27: error: 'printf' was not declared in this scope
             printf("NO!\n");  
                           ^
0_0_23709606_5830.cpp:21:28: error: 'printf' was not declared in this scope
             printf("YES!\n");  
                            ^
0_0_23709606_5830.cpp:23:27: error: 'printf' was not declared in this scope
             printf("NO!\n");  
                           ^