Thread: Program Shuts Down

Hi All,

I am writting a Currency Converter for a class and for some reason when I add my first value and hit enter the program fails... Any Thoughts? Thank You in advance.

Code:

#include <stdio.h>

main()

{

int iOperand1 = 0;
int iOperand2 = 0;
int iResult = 0;


/* Currency Rates*/
printf("\n-=Currency Conversions=-\n"); 
printf("\nSouth Korean Won = 922.403\n"); 
printf("\nKuwait Dinar = 0.281700\n"); 
printf("\nItalian Lire = 1418.51\n"); 
printf("\nJamaica Dollar = 68.7264\n"); 
printf("\nAustralian Dollar = 1.18906\n"); 

/* Currency Converter*/
printf("\nEnter US Dollar Amount");
scanf("\n&#37;d", iOperand1);
printf("\nEnter Currency to Exchange Rate");
scanf("\n%.2d", &iOperand2);

iResult = iOperand1 * iOperand2;

printf("The Exchange Rate is %.2d\n", iResult);

}

No, don't want to make the user type an extra enter every time they want your program to stop.

Better to run the program from a command-prompt. I suspect you're running from an IDE of sorts, and the command window is closing before you can see the output. Open a terminal.

EDIT: Ah, I didn't read the question very well. Still might apply though. Anyways here's one way to read user input.

Code:

char buffer[BUFSIZ];
double money; /* Use double for floating-point values like money */
fgets(buffer, BUFSIZ, stdin); /* safe way to read input from a user */
fscanf(buffer, "%f", &money); /* this can be modified for different inputs */

I see what is happening, it does not like (.) decimals in the values... for example 1.00 or 5.22 Anyway to rectify that?

> Do I need to add a getch(); at the end of each scanf?
No, and nor do you need all those "\n" in there either. Whitespace (including newlines) is automatically skipped.

Which compiler are you using?
> scanf("\n%d", iOperand1);

Code:

$ gcc -Wall foo.c
foo.c:5: warning: return type defaults to `int'
foo.c: In function `main':
foo.c:22: warning: format argument is not a pointer (arg 2)
foo.c:24: warning: unknown conversion type character `.' in format
foo.c:24: warning: too many arguments for format
foo.c:30: warning: control reaches end of non-void function

Gcc can catch a lot of minor mistakes which often trip up newbies.

> I am using Dev-C++
Which is a port of the gcc compiler, so you can use that flag I suggested.

Locate the project or compiler settings and add that flag, then recompile your program. Pay close attention to all the extra information which is printed.

True, but in a choice between specific diagnostics at compile time vs. random crash at run-time I know which I'd prefer.

The confusion is there anyway. At least the compiler will explain to him when he makes these mistakes so he doesn't have to spend countless hours looking over code that has hidden bugs. To argue against raising the level of warnings/errors that the compiler will spit out in this case is ridiculous.

No, he can eliminate cryptic compiler errors by simply fixing a few function calls which use the wrong format, and he can do that by searching google. If he has any further "random crashes" or likewise bugs, I care not to correct those.

Of course I do not argue against raising of levels of warnings and the like. I use:

Code:

GCC -Wall -pedantic -std=c99

for my code, and I recommend the same for u rest, and I make sure I get NO feedback upon compile.

You think this is cryptic?

Code:

syntaxprintf.c: In function `main':
syntaxprintf.c:7: warning: double format, different type arg (arg 2)

Code:

Code:

#include <stdio.h>

int main(void)
{
	int x = 5;
	
	printf("&#37;f", x);
	
	return 0;
}

I disagree. It tells you exactly where the error occurred, that it's a printf() format issue, and which argument it can't swallow.

Someone that can't figure out what the compiler is telling them with this error probably can't figure it out with google.