View Compilation Error

0_0_33136953_23036.cpp: In function 'int main()':
0_0_33136953_23036.cpp:11:21: error: 'scanf' was not declared in this scope
     scanf("%d",&Case);
                     ^
0_0_33136953_23036.cpp:15:31: error: 'printf' was not declared in this scope
         printf("Case #%d: ",ii);
                               ^
0_0_33136953_23036.cpp:17:29: error: 'memset' was not declared in this scope
         memset(a,0,sizeof(a));
                             ^