floating point exception occurs...Why??? I'm using integers

KinAz · March 2010

Hi, all

Instead of posting my entire code, I'll just post the snippet where the error pops up. I appreciate your responses.

Here is my main code:

#import

int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
GasMileage *myGas = [[GasMileage alloc]init];
int miles = 0;

//grabbing the value stored at the address of miles variable
int *milepointer= &miles;

//Obtaining user input
NSLog(@"How many miles did you drive?");
scanf ("%i", &miles);

//setting user input values
[myGas setmilesdriven: *milepointer];

//calculate mpg
[myGas calcmpg];

[pool drain];
return 0;
}

Here's the snippet of code where the error pops up:

@implementation GasMileage

-(void) calcmpg
{

//calculating mpg
int gallons = 0;
int *gallonpointer = &gallons;
*gallonpointer = gallonsused;
NSLog(@"How many gallons did you use?");
scanf ("%i", &gallons);

int total;
total = milesdriven/gallonsused;
NSLog(@"Your mpg: %i", total);

//I did not paste remaining code for this method call

Here's my output from Terminal:

Last login: Fri Mar 19 11:48:54 on ttys001
karen-haqs-imac:~ karenhaq$ /Users/karenhaq/Objective-C/GasMileage/build/Debug/GasMileage ; exit;
2010-03-19 11:52:10.895 GasMileage[55145:10b] How many miles did you drive?
40
2010-03-19 11:52:21.721 GasMileage[55145:10b] How many gallons did you use?
10
Floating point exception
logout

[Process completed]

KinAz · March 2010

I figured out my error. How embarrassing, it was a simple dereferencing pointer issue.

Mr Jack · March 2010

int gallons = 0;
int *gallonpointer = &gallons;
*gallonpointer = gallonsused;

Why not just do int gallons = gallonsused;? Faster, less code, and less error prone.

KinAz · March 2010

I need to focus at cleaning up the code before the final release. :)

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floating point exception occurs...Why??? I'm using integers

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