View Compilation Error

0_0_19109760_11768.cpp: In function 'int main()':
0_0_19109760_11768.cpp:8:18: error: 'scanf' was not declared in this scope
     scanf("%d",&t);  
                  ^
0_0_19109760_11768.cpp:12:27: error: 'printf' was not declared in this scope
         printf("%d\n",a[n]);  
                           ^