Program in C to open, read and write to a file

Write a program in C to open, read and write to a file

#include <stdio.h>

int main()

{

            float sales , commission;

            FILE *fin, *fout;

            fin = fopen("c:\\pop.dat","r");

            fout = fopen("c:\\pop2.dat","w");

            while (fscanf(fin,"%f",&sales) != EOF)

            {

                        fprintf(fout,"Your sales for the year were %8.2f \n",sales);

                        if(sales < 30000)

                                    commission = sales / 100 * 5;

                        else

                                    commission = sales / 100 * 10;

                        fprintf(fout,"Your commission is %8.2f",commission);

            }

            return 0;

}