Thread: help with input and scanf

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;
}

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++)

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;
}