View Compilation Error

0_0_22429361_13828.cpp: In function 'int main()':
0_0_22429361_13828.cpp:3:18: error: 'scanf' was not declared in this scope
     scanf("%d",&t);
                  ^
0_0_22429361_13828.cpp:13:26: error: 'printf' was not declared in this scope
         printf("%d\n",sum);
                          ^