How to use For loop with char?

Question

By using a for loop. I want to let the user input the amount of lemonade that they want to order. Then my program will calculate the tax, subtotal, and total. After it should let them continue by either entering 'y' or 'n'.
When I compile these codes. All I get are blanks. What is wrong with my codes?

So I made some changes. But I don't know how to have it stop the program if I enter 'n' if they ask to continue.

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>

void main()
{
    int NumCups;
    float SubTot, Tot = 0, Tax;
    char more;

    printf("Enter the number of cups:");
    scanf("%d", &NumCups);
    SubTot = NumCups*1.29;
    Tax = SubTot*0.0825;
    Tot = SubTot + Tax;

    printf("Subtotal:%0.2f\nTax:%0.2f\nTotal:%0.2f\n", SubTot, Tax, Tot);
    fflush(stdin);
    printf("Thank you.\nWould you like to order more lemonade?\n");

    for (; scanf("%c", &more);)
    {
        printf("Enter the number of cups:");
        scanf("%d", &NumCups);

        SubTot = NumCups*1.29;
        Tax = SubTot*0.0825;
        Tot += SubTot + Tax;
        fflush(stdin);
        printf("Subtotal:%0.2f\nTax:%0.2f\nTotal:%0.2f\n", SubTot, Tax, Tot);
        printf("Thank you.\nWould you like to order more lemonade?\n");
    }
    system("pause");
}

you're expecting that some symbol should be entered first only then you will ask for number of cups — Iłya Bursov
– Iłya Bursov, Commented Apr 25, 2015 at 0:06
Not related to your problem, but note that you should use int main() instead of void main(). Also, fflush(stdin) is undefined behaviour. (This might be related to your problem.) Also, please post a compilable example, stating the expected output and actual output explicitly. — user12205
– user12205, Commented Apr 25, 2015 at 0:09
What's the point of count? I don't see it used anywhere other than being incremented (for no apparent reason?). Why not just use a while loop? I think it would be more appropriate for your program. — DigitalNinja
– DigitalNinja, Commented Apr 25, 2015 at 0:23

Francisco Collado Arocha · Accepted Answer · 2015-04-25 00:42:47Z

1

Try this:

 for (; scanf("%c", &more)&&more=='y';)

This change will let you continue only when you use the y character.

answered Apr 25, 2015 at 0:42

Francisco Collado Arocha

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BLUEPIXY · Accepted Answer · 2015-04-25 09:44:26Z

0

do {
    printf("Enter the number of cups:");
    scanf("%d", &NumCups);

    SubTot = NumCups*1.29;
    Tax = SubTot*0.0825;
    Tot += SubTot + Tax;
    fflush(stdin);
    printf("Subtotal:%0.2f\nTax:%0.2f\nTotal:%0.2f\n", SubTot, Tax, Tot);
    printf("Thank you.\nWould you like to order more lemonade?\n");
} while(1 == scanf(" %c", &more) && 'y' == more);

answered Apr 25, 2015 at 9:44

BLUEPIXY

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