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

This is a discussion on 5-9.c:8: warning: format ‘%f’ expects type ‘float *’, but argument 2 has type ‘double within the C Programming forums, part of the General Programming Boards category; dont know the problem?? why is there error? Code: #include <stdio.h> float calculateCharge (float x); int main (void) { float ...

  1. #1
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    5-9.c:8: warning: format ‘%f’ expects type ‘float *’, but argument 2 has type ‘double

    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;}
    }

  2. #2
    DESTINY BEN10's Avatar
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    Quote Originally Posted by poyaochuang View Post
    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.
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  3. #3
    ATH0 quzah's Avatar
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    14,826
    You need %lf for scanning doubles.


    Quzah.
    Hope is the first step on the road to disappointment.

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