View Compilation Error

0_0_34613817_9655.cpp: In function 'int main()':
0_0_34613817_9655.cpp:4:23: error: 'scanf' was not declared in this scope
     scanf("%d\n%d",i,j);
                       ^
0_0_34613817_9655.cpp:7:16: error: 'printf' was not declared in this scope
     printf("\n");
                ^
0_0_34613817_9655.cpp:16:25: error: 'printf' was not declared in this scope
  printf("\n%d\n%d",m,ret);
                         ^