View Compilation Error

0_0_26973741_11433.cpp: In function 'int main(int, char**)':
0_0_26973741_11433.cpp:9:19: error: 'scanf' was not declared in this scope
     scanf("%d", &T);
                   ^
0_0_26973741_11433.cpp:22:27: error: 'printf' was not declared in this scope
         printf("%d\n", ans);
                           ^