// Calc.h file:

#import <Foundation/Foundation.h>
#import <Foundation/NSString.h>
#import <Cocoa/Cocoa.h>

int tGlobalVar = 0;
int xGlobalVar = 0;
int gGlobalVar = 0;

@interface Calc : NSObject
{
	IBOutlet NSTextField *answer;
	IBOutlet NSTextField *a;
	IBOutlet NSTextField *b;
	IBOutlet NSTextField *c;
	IBOutlet NSTextField *percent;
	IBOutlet NSTextField *x;
	IBOutlet NSTextField *g;
}
-(IBAction) answer: (id) sender;
//-(IBAction) right: (id) sender;
-(IBAction) wrong: (id) sender;
-(IBAction) clearAll: (id) sender;
-(IBAction) multiply: (id) sender;
@end


// Calc.m file:

#import "Calc.h"
@implementation Calc
-(IBAction) multiply: (id) sender
{
	NSInteger buttonTitle = [sender tag];
	[answer setIntegerValue: buttonTitle];
}
-(IBAction) answer: (id) sender
{
	int aAnswer, bAnswer, cAnswer, result;
	aAnswer = [a intValue];
	bAnswer = [b intValue];
	cAnswer = [c intValue];

	result = aAnswer * bAnswer;

	if (cAnswer != result)
	{
		++tGlobalVar;
		++xGlobalVar;
		[x setIntValue: xGlobalVar];
	}
	else if ((cAnswer == result) && (cAnswer != 0))
	{
		++tGlobalVar;
		++gGlobalVar;
		[g setIntValue: gGlobalVar];
	}
}
-(IBAction) clearAll: (id) sender
{
	[a setIntValue: 0];
	[b setIntValue: 0];
	[c setIntValue: 0];
	[answer setIntValue: 0];
	gGlobalVar = gGlobalVar - gGlobalVar;
	[x setIntValue: gGlobalVar];
	xGlobalVar = xGlobalVar - xGlobalVar;
	[g setIntValue: gGlobalVar];
	NSString *wrongValue = @"Please enter a value to begin";
	[percent setStringValue: wrongValue];
}
-(IBAction) wrong: (id) sender
{
	float num, denum, result;

	num = [x floatValue];
	denum = (float) tGlobalVar;
	result = (num/denum)*100.0;

	if (xGlobalVar == 0 && gGlobalVar == 0)
	{
		NSString *wrongValue = @"You must first compute to begin.";
		[percent setStringValue: wrongValue];
	}
	else if (xGlobalVar == 0 && gGlobalVar != 0)
	{
		NSString *wrongValue = @"You have 100% correct.";
		[percent setStringValue: wrongValue];
	}
	else if (xGlobalVar != 0 && gGlobalVar == 0)
	{
		NSString *wrongValue = @"You have 100% incorrect.";
		[percent setStringValue: wrongValue];
	}
	else if (xGlobalVar != 0 && gGlobalVar != 0)
	{
		NSString *wrongValue = [NSString stringWithFormat: @"The amount you have wrong is %.1f%%", result];
		[percent setStringValue: wrongValue];
	}
}
@end