View Compilation Error

0_0_18148553_15110.cpp: In function 'int main()':
0_0_18148553_15110.cpp:6:23: error: 'scanf' was not declared in this scope
  while(~scanf("%s",str))
                       ^
0_0_18148553_15110.cpp:10:21: error: 'printf' was not declared in this scope
       printf("TAT\n");
                     ^
0_0_18148553_15110.cpp:17:22: error: 'printf' was not declared in this scope
        printf("TAT\n");
                      ^
0_0_18148553_15110.cpp:26:20: error: 'printf' was not declared in this scope
     printf("%d\n",t);
                    ^