Thread: 5-9.c:8: warning: format ‘%f’ expects type ‘float *’, but argument 2 has type ‘double

Originally Posted by poyaochuang

dont know the problem?? why is there error?

Code:

#include <stdio.h>
float calculateCharge (float x);
int main (void)
{
   float hour1,hour2,hour3,totalhour;
   float cost1,cost2,cost3,totalcost;
   printf("Enter hours parked for the three vehicle: ");
   scanf("%f%f%f",&hour1,&hour2,&hour3);
   totalhour=hour1+hour2+hour3;
   cost1=calculateCharge(hour1);
   cost2=calculateCharge(hour2);
   cost3=calculateCharge(hour3);
   printf("Car\tHours\tCharge\n");
   printf("1\t%.2f\t%.2f\n", hour1, cost1);
   printf("2\t%.2f\t%.2f\n", hour2, cost2);
   printf("3\t%.2f\t%.2f\n", hour3, cost3);
   printf("Total\t%.2f\t%.2f\n", totalhour, totalcost);
   return 0;
}
float calculateCharge (float x)
{
   float charge;
   if (x>3){
      charge=((x-3)*.50)+2;
      if (charge>10){
         charge=10;}}
   else {
      charge=2;}
}

Also there should be a return charge; statement in the calculate() function.

You need %lf for scanning doubles.


Quzah.