% cat  payroll.c

/* payroll - calculate pay given time and a half for overtime

*  Written by: C. Severance - Tue Dec  7 22:18:41 EST 1993

*/

main() {

  float rate,hours,pay;

/* Prompt the user for hours and the rate */

  printf("enter the hours worked - \n");
  scanf("%f",&hours);
  printf("enter the pay per hour -\n");
  scanf("%f",&rate);

/* Calculate the pay compensating for overtime */

  if ( hours > 40.0 ) {
    pay = rate * 40.0 + ( rate * 1.5 * (hours - 40.0));
  } else {
    pay = rate * hours;
  }

/* Print out the pay */

  printf("pay is -  %f\n",pay);
}
% cc  payroll.c
% a.out 
enter the hours worked - 
42
enter the pay per hour -
8.00
pay is -  344.000000
%