Code:

-(IBAction)calculate:(id)sender {

float m = ([variableM.text floatValue]);

float x = ([variableX.text floatValue]);

float y = ([variableY.text floatValue]);

float a = m*x;

float b = a+y;

//////////ERROR BEGINS HERE//////////

if (float b > 0) {

positive.hidden = YES;

}

else {

positive.hidden = NO;

}

//////////ERROR ENDS HERE//////////

answerB.text = [[NSString alloc] initWithFormat:@"%2.f", b];

answerM.text = [[NSString alloc] initWithFormat:@"%2.f", a];

}

I have no idea what's wrong with the code. 10 points for best answer!