Basic calculator Help

[aceiswild]

Hey guys. I have coded a simple calculator and it all works perfectly. My only issue is when i type in a number, say for example i push number 7, it will show as 7.000000 instead of just 7. How can i remove these .000000's? And if there is a way to add percent to it.

Here's my .M code:

.M

// -- CALCULATOR CODE START --

-(IBAction)buttonDigitPressed:(id)sender {
	currentNumber = currentNumber*10 + (float)[sender tag];
	calculatorScreen.text = [NSString stringWithFormat:@"%2f",currentNumber];
}
-(IBAction)buttonOperationPressed:(id)sender {
	if (currentOperation == 0) result = currentNumber;
	else {
		switch (currentOperation) {
			case 1:
				result = result + currentNumber;
				break;
			case 2:
				result = result - currentNumber;
				break;
			case 3:
				result = result * currentNumber;
				break;
			case 4:
				result = result / currentNumber;
				break;
			case 5:
				currentOperation = 0;
				break;
		}
	}
	currentNumber = 0;
	calculatorScreen.text = [NSString stringWithFormat:@"%2f",result];
	if ([sender tag] == 0) result = 0;
	currentOperation = [sender tag];
}
-(IBAction)cancelInput {
	currentNumber = 0;
	calculatorScreen.text = @"0";
}
-(IBAction)cancelOperation {
	currentNumber = 0;
	calculatorScreen.text = @"0";
	currentOperation = 0;
}

// -- CALCULATOR CODE END --

Any help much appreciated!