View Compilation Error

0_0_20763893_2441.cpp: In function 'int main()':
0_0_20763893_2441.cpp:9:18: error: 'scanf' was not declared in this scope
     scanf("%d",&t);
                  ^
0_0_20763893_2441.cpp:19:38: error: 'printf' was not declared in this scope
         printf("%ld\n",sum%1000000007);
                                      ^