[Dev-C++] Newbie

[Randy H. <ran...@rc...>]

Hi..I'm just getting started and I understand that when you want to halt
the screen in order to read the result in DOS you must enter
system("PAUSE");
Why does this work sometimes and other times I get a compilation error
  " 18: implicit declaration of function `int system(...)' "

Here is a sample no-brainer program I coded that produces just that
error...
Thanks!

#include <stdio.h>

 main()
{
float perCent,result,num;

printf("Enter the number you want a percentage of :\n");
scanf("%f",&num);

printf("Enter the percentage of that number you want calculated :\n");
scanf("%f", &perCent);

  result = (num * perCent)/100;

     printf("%f  percent of  %f  =  %f", perCent,num,result);

             system("PAUSE");

            return 0;

  }