View Compilation Error

0_0_17511328_1924.cpp: In function 'int main()':
0_0_17511328_1924.cpp:12:17: error: 'scanf' was not declared in this scope
    scanf("%d",&i);
                 ^
0_0_17511328_1924.cpp:20:28: error: 'printf' was not declared in this scope
              printf("YES\n");
                            ^
0_0_17511328_1924.cpp:23:30: error: 'printf' was not declared in this scope
                 printf("NO\n");
                              ^