warning: implicit declaration of function 'system'

Question

I am getting an error in my compiler:

Warning: implicit declaration of function 'system'

I added:

system("cls");

To be able to clear the screen, and now I get the error. I am using this code to test:

#include <stdio.h>

int nothing; //random name

int main()
{
printf("this is a msg");
scanf("%d",&nothing);
system("cls");
printf("hello");
getchar();

return 0;
}

This is just a test code, so it's very sloppy. I am new to coding so any help would be appreciated.

Answer 1

For C++: #include <cstdlib>, for C: #include <stdlib.h>.

Or, you can do as follows:

#ifdef __cplusplus__
  #include <cstdlib>
#else
  #include <stdlib.h>
#endif

if (system("CLS")) system("clear");

You can also see a full article w.r.t Clear the screen.