[课堂实践与项目]IOS优先级的计算器

这个计算器主要是使用数组进行实现的.虽然没有使用前缀后缀表达式,但是是一种方法o.

.h文件

//
//  LCViewController.h
//  具有优先级的calculator
//
//  Created by lichan on 13-12-4.
//  Copyright (c) 2013年 com.lichan. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface LCViewController : UIViewController
@property (retain, nonatomic) IBOutlet UITextField *textField;
@property (retain, nonatomic) IBOutlet UITextField *longTextField;

@property (strong,nonatomic)NSMutableArray *numbersArray;

@property (strong,nonatomic)NSMutableArray *operateArray;

@property (copy,nonatomic)NSString *numberTempString;

- (IBAction)longTextField:(id)sender;

- (IBAction)numberPressed:(id)sender;
- (IBAction)clearScreen:(id)sender;

- (IBAction)operatePressed:(UIButton *)sender;
- (IBAction)equalOperate:(id)sender;
@end

.m文件

//
//  LCViewController.m
//  具有优先级的calculator
//
//  Created by lichan on 13-12-4.
//  Copyright (c) 2013年 com.lichan. All rights reserved.
//

#import "LCViewController.h"

@interface LCViewController ()

@end

@implementation LCViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    _numberTempString = [[NSMutableString alloc]init];
    _numbersArray = [[NSMutableArray alloc]init];
    _operateArray = [[NSMutableArray alloc]init];
	// Do any additional setup after loading the view, typically from a nib.
}

-(void)dealloc
{
    [_numberTempString release];
    [_textField release];
    [_numbersArray release];
    [_operateArray release];
    [_longTextField release];
    [super dealloc];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)numberPressed:(id)sender {

    UIButton *tempButton = (UIButton *)sender;

    NSString *tempNumber = [tempButton titleLabel].text;//得到button的title值,以便于在textField显示

    [_textField setText:[NSString stringWithFormat:@"%@%@",_textField.text,tempNumber]];  //textfield 上字符串的连接,以便于形成字符串

     [_longTextField setText:[NSString stringWithFormat:@"%@%@",_longTextField.text,tempNumber]];

    _numberTempString = _textField.text;

}

- (IBAction)clearScreen:(id)sender {

    [_numbersArray removeAllObjects];
    [_operateArray removeAllObjects];
    _numberTempString = nil;
    [_textField setText:@""];
    [_longTextField setText:@""];
}

- (IBAction)operatePressed:(UIButton *)sender {

    UIButton *tempButton = (UIButton *)sender;

    NSString *temp = [tempButton titleLabel].text;//得到button的title值,以便于在textField显示

    [_longTextField setText:[NSString stringWithFormat:@"%@%@",_longTextField.text,temp]];

    if (_textField.text != nil) {

        [_numbersArray addObject:_numberTempString];

        NSLog(@"---_numbersArray%@",_numbersArray);

        [_textField setText:@""];

        [_operateArray addObject:sender.currentTitle];
        NSLog(@"_operateArray %@",_operateArray);
    }
    else if (_textField.text == nil)
    {
        [_operateArray removeLastObject];
    [_operateArray addObject:sender.currentTitle];
    NSLog(@"_operateArray %@",_operateArray);
    }

}

- (IBAction)equalOperate:(id)sender {

    UIButton *tempButton = (UIButton *)sender;

    NSString *temp = [tempButton titleLabel].text;//得到button的title值,以便于在textField显示

    [_longTextField setText:[NSString stringWithFormat:@"%@%@",_longTextField.text,temp]];

    if (_textField.text != nil) {

        [_numbersArray addObject:_numberTempString];

        NSLog(@"---_numbersArray%@",_numbersArray);

    }

    //----------------
NSString *result = [[NSString alloc]init];

while (_numbersArray.count >= 3 )
{

    NSString *firstOperate = [_operateArray objectAtIndex:0];
    NSString *sencondOperate = [_operateArray objectAtIndex:1];

    NSString *firstNumber = [_numbersArray objectAtIndex:0];
    NSString *sencondNumber = [_numbersArray objectAtIndex:1];
    NSString *thirdNumber = [_numbersArray objectAtIndex:2];

    if ([firstOperate isEqualToString:@"+"] ||[firstOperate isEqualToString:@"-"])
    {
       if ([sencondOperate isEqualToString:@"*"] ||[sencondOperate isEqualToString:@"/"])
       {

           if ([sencondOperate isEqualToString:@"*"]) {
               result = [self multiOperatorSymbolByOne:sencondNumber Two:thirdNumber];

           }
           if ([sencondOperate isEqualToString:@"/"]) {
               result = [self divOperatorSymbolByOne:sencondNumber Two:thirdNumber];

           }
           [_operateArray removeObjectAtIndex:1];

           [_numbersArray removeObjectAtIndex:2];
           [_numbersArray replaceObjectAtIndex:1 withObject:result];
           NSLog(@"num:%@",_numbersArray);

       }
        else
        {
            NSString *result = [[NSString alloc]init];
            if ([firstOperate isEqualToString:@"+"]) {
            result = [self plusOperatorSymbolByOne:firstNumber Two:sencondNumber];

            }
            if ([firstOperate isEqualToString:@"-"]) {
            result = [self subOperatorSymbolByOne:firstNumber Two:sencondNumber];

            }

            [_operateArray removeObjectAtIndex:0];

             [_numbersArray replaceObjectAtIndex:0 withObject:result];
            [_numbersArray removeObjectAtIndex:1];

            NSLog(@"%@",_numbersArray);

        }

    }
    else
    {
        NSString *firstOperate = [_operateArray objectAtIndex:0];

        NSString *firstNumber = [_numbersArray objectAtIndex:0];
        NSString *sencondNumber = [_numbersArray objectAtIndex:1];

        if ([firstOperate isEqualToString:@"*"]) {
            result = [self multiOperatorSymbolByOne:firstNumber Two:sencondNumber];

        }

        if ([firstOperate isEqualToString:@"/"]) {
            result = [self divOperatorSymbolByOne:firstNumber Two:sencondNumber];

        }

        [_operateArray removeObjectAtIndex:0];

        [_numbersArray removeObjectAtIndex:1];
        [_numbersArray replaceObjectAtIndex:0 withObject:result];
           NSLog(@"%@",_numbersArray);

    }

}

    NSString *firstOperate = [_operateArray objectAtIndex:0];

    NSString *firstNumber = [_numbersArray objectAtIndex:0];
    NSString *sencondNumber = [_numbersArray objectAtIndex:1];
       NSLog(@"%@",_numbersArray);

        if ([firstOperate isEqualToString:@"*"]) {
            result = [self multiOperatorSymbolByOne:firstNumber Two:sencondNumber];

        }
        if ([firstOperate isEqualToString:@"/"]) {
            result = [self divOperatorSymbolByOne:firstNumber Two:sencondNumber];

        }

        if ([firstOperate isEqualToString:@"+"]) {
            result = [self plusOperatorSymbolByOne:firstNumber Two:sencondNumber];

        }
        if ([firstOperate isEqualToString:@"-"]) {
            result = [self subOperatorSymbolByOne:firstNumber Two:sencondNumber];

        }

   NSLog(@"result : %@",result);

[_longTextField setText:[NSString stringWithFormat:@"%@%@",_longTextField.text,result]];

}

#pragma mark 操作符号 method

- (NSString *)plusOperatorSymbolByOne:(NSString *)str1 Two:(NSString *)str2
{
    float num1 = [str1 floatValue];
    float num2 = [str2 floatValue];

    float resultNum = num1 + num2;

    return [NSString stringWithFormat:@"%f",resultNum];

}

- (NSString *)subOperatorSymbolByOne:(NSString *)str1 Two:(NSString *)str2
{
    float num1 = [str1 floatValue];
    float num2 = [str2 floatValue];

    float resultNum = num1 - num2;

    return [NSString stringWithFormat:@"%f",resultNum];

}

- (NSString *)multiOperatorSymbolByOne:(NSString *)str1 Two:(NSString *)str2
{
    float num1 = [str1 floatValue];
    float num2 = [str2 floatValue];

    float resultNum = num1 * num2;

    return [NSString stringWithFormat:@"%f",resultNum];

}

- (NSString *)divOperatorSymbolByOne:(NSString *)str1 Two:(NSString *)str2
{
    float num1 = [str1 floatValue];
    float num2 = [str2 floatValue];

    float resultNum = num1 / num2;

    return [NSString stringWithFormat:@"%f",resultNum];

}

@end