View Compilation Error

0_0_28717308_15097.cpp: In function 'int main()':
0_0_28717308_15097.cpp:7:15: error: 'scanf' was not declared in this scope
  scanf("%d",&t);
               ^
0_0_28717308_15097.cpp:44:19: error: 'printf' was not declared in this scope
      printf("%d",b);
                   ^
0_0_28717308_15097.cpp:45:24: error: 'printf' was not declared in this scope
     else printf(" %d",b);
                        ^
0_0_28717308_15097.cpp:47:20: error: 'printf' was not declared in this scope
         printf("\n");
                    ^