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Help in C

post #1 of 10
Thread Starter 
Sooo, I am starting C and I have no idea what I am doing lol.

I have to make a program to convert miles to kilometers in C. This is what I have so far, but I can not get past inputting the value for miles. It just crashes after I input the # and hit enter. -___-

What do you think it is?
Code:
/*----------------------------------------------------------*/
/* Assignment 2 */
/* This program converts miles to kilometers */

#include <stdio.h>
#include <math.h>
#define KM_PER_MILE 1.6093440

int main()
{
        /* Declare and initialize variables */
        double miles, kilometers;

        /* Get distance in miles */
        printf("Enter distance in miles: \n");
        scanf("%lf", &miles);

        /* Convert miles to kilometers */
        kilometers = miles * KM_PER_MILE;

        /* Display distance in kilometers */
        printf("That equals %lf kilometers. \n", kilometers);

        /* Exit program */
        getchar();
        return 0;
}
/*----------------------------------------------------------*/
post #2 of 10
Define "crash"?
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post #3 of 10
Thread Starter 
Keeps crashing still. frown.gif
post #4 of 10
Quote:
Originally Posted by Sean Webster View Post

Keeps crashing still. frown.gif

See my edit (You got it right actually, I was thinking something different).
I just dumped your code in my IDE and it runs fine...
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post #5 of 10
Thread Starter 
Wow, I am thinking it is the virtual machine from my school then. Look at this:

61207108f06c4177a0126a6.png

Thanks, I am installing Visual studio 2010 Ultimate now to verify myself. (love free software from school. biggrin.gif)
post #6 of 10
scanf has a flaw. It has problems with flushing the input buffer.
Your program isn't crashing, getchar() is just seeing the input from the previous scanf call- and returns instead of waiting - so the program exits.

If you add a call to flushall() before getchar() it will work properly - but I'd advise against using scanf,
Code:
/*----------------------------------------------------------*/
/* Assignment 2 */
/* This program converts miles to kilometers */
#include <stdio.h>
#include <math.h>

#define KM_PER_MILE 1.6093440

int _tmain()
{
        /* Declare and initialize variables */
        double miles, kilometers;

        /* Get distance in miles */
        printf("Enter distance in miles: \n");
        scanf("%lf", &miles);

        /* Convert miles to kilometers */
        kilometers = miles * KM_PER_MILE;

        /* Display distance in kilometers */
        printf("That equals %lf kilometers. \n", kilometers);

        /* Exit program */
        flushall();
        getchar();
        return 0;
}
/*----------------------------------------------------------*/

Edit: See here for more info: http://stackoverflow.com/questions/1716013/why-is-scanf-causing-infinite-loop-in-this-code
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post #7 of 10
Thread Starter 
Wow, it worked! Thanks. biggrin.gif



What can I use instead of scanf? I have only learned of it so far. redface.gif
post #8 of 10
Quote:
Originally Posted by Sean Webster View Post

Wow, it worked! Thanks. biggrin.gif

What can I use instead of scanf? I have only learned of it so far. redface.gif

You can use sscanf or scanf_s. Check out the link in my edit smile.gif
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post #9 of 10
Thread Starter 
Neither sscanf, nor scanf_s worked lol.
post #10 of 10
Quote:
Originally Posted by Sean Webster View Post

Neither sscanf, nor scanf_s worked lol.

They aren't as easy as scanf smile.gif
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