Something wrong with my for statement

[Extropian]

I'm getting three or four errors in thi sone statement...?? I can't for the life of me see what they could be.

	int 	stay;
	int 	car = 0;
    float 	charge;



    printf("How long did the vehicle stay in the garage?");
    scanf("%d" , &stay);

    for (stay <= 24; car++) {

Any help would be appreciated.
Regards,
extro

[Dave_Sinkula]

for ( /* initialization? */; stay <= 24; car++ ) {

[Extropian]

I wanted it to be car <=3 but it says operator has no effect(on the stay argument too):

int 	stay;
	int 	car = 0;
    float 	charge;



    printf("How long did the vehicle stay in the garage?");
    scanf("%d" , &stay);

    for(car <= 3; stay <= 24; car++) {

[Dave_Sinkula]

I wanted it to be car <=3 but it says operator has no effect(on the stay argument too)

Could you describe in your own words what you think an initialization of car <=3 should do?

[Lionmane]

When you say 'car <= 3', you're actually making a comparison. However, the computer is expecting you to assign a value (ie: 'car = 3').

Also, when you say 'stay <= 24' you're using a variable that is input from the user:

1) If the user enters anything over 24, then the for loop will not execute
2) If the 'stay' variable is not changed inside of the for loop, it will execute infinitely

[Extropian]

I got some working code but I'm getting a syntax error right at the end, any thoughts onw aht could be wrong would be a big help
Thanks,
Extro

include<stdio.h>
 float    calculateCharges (float charge);
 int main()
{
   
	int 	stay;
	int 	car = 0;
    float 	charge;



    printf("How long did the vehicle stay in the garage?");
    scanf("%d" , &stay);

    for(car <= 3; stay <= 24; car++) {

	    if(stay <= 3){
	       charge = 2.00;
           printf("%s%13s%13s\n", "Car", "Hours", "Charge");
           printf("%13d%13d%13f\n" ,car, stay, charge);
}
        if(stay > 3){
           printf("%d%13%13\n," , car, stay , calculateCharges(charge) );
}
        if(stay == 24){
	       charge = 10;
           printf("%13d%13d%13f\n" , car, stay, calculateCharges(charge));
}
}
return 0;
}

float calculateCharges (float charge);
{
return stay * 1 / 2;
}

[Dave_Sinkula]

Errant semicolon.

float calculateCharges (float charge);
{
return stay * 1 / 2;
}

[Lionmane]

Your 'for' loop still seems to be incorrect.

Also, when you pass 'charge' to your function 'calculateCharges' you don't use it for anything.

You don't need the semicolon after 'float calculateCharges (float charge);' near the bottom.

[Extropian]

Ok I foxed that but now 'stay' is undeclared. Can I carry it over into the function somehow?

[Lionmane]

Sure. Just declare it as an argument in your prototype (at the top of your program):

float calculateCharges (float charge, int stay);

Once you do that, you can pass 'stay' to the function.

mw

[Extropian]

Thanks, that ssemed to work but now I have the error:
too few arguments to function 'calculateCharges'

 printf("%13d%13%13f\n," , car, stay , calculateCharges(charge) );

Thank for all the help.
extro

[Dave_Sinkula]

Thanks, that ssemed to work but now I have the error:
too few arguments to function 'calculateCharges'

Put a little more effort into reading the diagnostic messages. If you change your function from receiving one parameter to receiving two parameters, do you think you should call it with one argument or two?