C Program ended even with getchar()

Asked Aug 29 '17 at 08:46

Active Aug 29 '17 at 09:04

Viewed 61 times

I made this very very simple program on xcode:

#include <stdio.h>
int main(void)
{
   float fix;
   float var;
   float price;
   int res;

   printf("This BEP calculator uses this formula:");
   printf("\nFixed Costs ÷ (Price - Variable Costs per unit) = Breakeven Point in Units\n\n");

   printf("Input product costs: ");
   scanf("%f",&price);
   fflush(stdin);

   printf("Input fixed costs: ");
   scanf("%f",&fix);
   fflush(stdin);

   printf("Input variable costs per unit: ");
   scanf("%f",&var);
   fflush(stdin);

   res = fix / (price - var);
   printf("The break even point is roughly %d units\n",res);
   printf("Thank you from using this program\n");
   getchar();
   return 0;
}

But every time it gets to the result the program automatically closes, ignoring getchar().

What's the problem?

edited Aug 29 '17 at 08:52

Andre Kampling

5,476
2
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asked Aug 29 '17 at 08:46

agikarasugi

3

Welcome to Stack Overflow! [`fflush(stdin);` is undefined behaviour, don't do it.](https://stackoverflow.com/a/38325926/2173917) – Sourav Ghosh Aug 29 '17 at 08:47
1

@agikarasugi Use two calls of getchar:) – Vlad from Moscow Aug 29 '17 at 08:48
1

Regard the remaining `\n` in buffer. – Sourav Ghosh Aug 29 '17 at 08:48
1

Instead of `fflush(stdin)` do this: http://c-faq.com/stdio/stdinflush2.html. – Andre Kampling Aug 29 '17 at 08:48
There are already some thousand questions on SO regarding trailing new line in stdin. – Lundin Aug 29 '17 at 09:47

C Program ended even with getchar()

0 Answers0