help with input and scanf

Hi, I've been having a little trouble debugging my friends code here. At the last scanf while executing the program, it seems to just skip it with a enter stroke or something, and doesn't allow me to enter y or n. Any help would be greatly appreciated.

ok quick fix but far from perfect you shouldn't really use scanf.... better would be fgets() and use atof() and atoi() to convert string input to numbers.

anyway:-

Code:

---

#include <stdio.h>

/* change values */
#define HALFDOLLARS .50
#define QUARTERS    .25
#define DIMES      .10
#define NICKLES    .05
#define PENNIES    .01

int main(void)
{
        char response[10]={0};

        while (response[0] != 'n') {
                int halfdollars_num = 0,
                quarters_num = 0,
                dimes_num = 0,
                nickles_num = 0,
                pennies_num = 0;

                double total_change = 0.0;

                /* ask and enter the number of coins */
                printf("\nEnter the number of Half-Dollars in the drawer: ");
                scanf("%d", &halfdollars_num);

                printf("\nEnter the number of quarters in the drawer: ");
                scanf("%d", &quarters_num);

                printf("\nEnter the number of dimes in the drawer: ");
                scanf("%d", &dimes_num);

                printf("\nEnter the number of nickles in the drawer: ");
                scanf("%d", &nickles_num);

                printf("\nEnter the number of pennies in the drawer: ");
                scanf("%d", &pennies_num);

                /* calculate */
                total_change += (double)(quarters_num * QUARTERS);
                total_change += (double)(halfdollars_num * HALFDOLLARS);
                total_change += (double)(dimes_num * DIMES);
                total_change += (double)(nickles_num * NICKLES);
                total_change += (double)(pennies_num * PENNIES);

                /* print total change */
                printf("\nTotal change = %2.2f\n", total_change);               

                /* ask if the user wants to do it again */
                printf("\nDo you want to process another drawer? ");
                scanf("%s", &response);
        }
        return 0;
}

---

Unfortunetly we havent learned that in my class and professor will not accept that. I think he wasnt scanf or getchar() this stinks. I know some other people in my class got it to work.

If you're looking for a quick fix, put;

fflush(stdin);

right before you ask about whether or not to do another drawer. This isn't portable, but it works on Dev-C++ (and I assume MSVC++)

Professor wont accept that either. It has to be either scanf ot getchar(). Do you think my look structure is wrong? or I have to do another type of a loop?

Nope, your loop looks fine...

If you can only use getchar() and scanf, then just put

getchar();

before you ask about the drawer....

i only used scanf() in fixing your code...... why is it no good for you?

Well, s_c, pure speculation, but this sounds like a really early assignment in a beginning class - maybe they can't use arrays or strings yet... Speculation, tho...

ok without the array code fixed!

Code:

---

#include <stdio.h>

/* change values */
#define HALFDOLLARS .50
#define QUARTERS    .25
#define DIMES      .10
#define NICKLES    .05
#define PENNIES    .01

int main(void)
{
        char response=0;

        while (response != 'n') {
                int halfdollars_num = 0,
                quarters_num = 0,
                dimes_num = 0,
                nickles_num = 0,
                pennies_num = 0;

                double total_change = 0.0;

                /* ask and enter the number of coins */
                printf("\nEnter the number of Half-Dollars in the drawer: ");
                scanf("%d", &halfdollars_num);

                printf("\nEnter the number of quarters in the drawer: ");
                scanf("%d", &quarters_num);

                printf("\nEnter the number of dimes in the drawer: ");
                scanf("%d", &dimes_num);

                printf("\nEnter the number of nickles in the drawer: ");
                scanf("%d", &nickles_num);

                printf("\nEnter the number of pennies in the drawer: ");
                scanf("%d", &pennies_num);

                /* calculate */
                total_change += (double)(quarters_num * QUARTERS);
                total_change += (double)(halfdollars_num * HALFDOLLARS);
                total_change += (double)(dimes_num * DIMES);
                total_change += (double)(nickles_num * NICKLES);
                total_change += (double)(pennies_num * PENNIES);

                /* print total change */
                printf("\nTotal change = %2.2f\n", total_change);               

                /* ask if the user wants to do it again */
                printf("\nDo you want to process another drawer? ");
                while (getchar() != '\n');
                response=getchar();
        }
        return 0;
}

---

I'm new but here's my 2 cents worth.
try one space between" and %s", and take the & out .
TRY IT ONE TIME then call me any name that comes to mind.
good luck.