View Compilation Error

0_0_23243904_3515.cpp: In function 'int main()':
0_0_23243904_3515.cpp:5:18: error: 'scanf' was not declared in this scope
     scanf("%d",&n);
                  ^
0_0_23243904_3515.cpp:7:13: error: 'getchar' was not declared in this scope
     getchar();
             ^
0_0_23243904_3515.cpp:11:17: error: 'gets' was not declared in this scope
         gets(str);
                 ^
0_0_23243904_3515.cpp:14:26: error: 'printf' was not declared in this scope
             printf("no\n");
                          ^
0_0_23243904_3515.cpp:21:31: error: 'printf' was not declared in this scope
                 printf("yes\n");
                               ^
0_0_23243904_3515.cpp:23:30: error: 'printf' was not declared in this scope
                 printf("no\n");
                              ^