戴维营第三天上课总结

今天轮到大茶给我们讲课, 给我们更加详细的讲解各个数据类型, 以及其他关键字, 并且给我们演示怎么用代码编写一个计算器, 还有怎么算闰年, 左移等等知识点, 其中的代码有

#include <stdio.h>int main(int argc, const char * argv[]) {int16_t y = 14, m = 9, d =17;int16_t data = 0;//y<<9                   //  0000  0000 0000 1110 // 0001 1100 0000 0000
(在一年之内, 存储只到2^7, 所以前面9个0就是没意义的, 就缩写成第二个状态)
//(m<<12)>>7//  0000 0001 0010 0000
//(d<<11)>>11// 0000 0000 0001 0001
data = (y<<9)|((m<<12)>>7)|((d<<11)>>11);printf("%02x\n", data);return 0;
}

#include <stdio.h>int main(int argc, const char * argv[]) {int year;printf("请输入年份: ");scanf("%d", &year);if((0 == year%4)||((0 == year%400)&&(0 != year%100))){printf("是闰年\n");}elseprintf("不是闰年\n");return 0;
}

//
//  ViewController.m
//  demo2
//
//  Created by apple on 14-9-17.
//  Copyright (c) 2014年 apple. All rights reserved.
//

#import "ViewController.h"@interface ViewController ()
{NSString *op1, *op2;char op;
}
@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];op1 = @"";op2 = @"";// Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)button1clicked:(id)sender {NSLog(@"1 clicked");if (op != '+' && op != '-'&& op != '*' && op != '/') {//1231op1 = [NSString stringWithFormat:@"%@%d", op1,1];}else{op2 = [NSString stringWithFormat:@"%@%d", op2,1];}
}
- (IBAction)button2clicked:(id)sender {NSLog(@"2 clicked");if (op != '+' && op != '-'&& op != '*' && op != '/') {//1231op1 = [NSString stringWithFormat:@"%@%d", op1,1];}else{op2 = [NSString stringWithFormat:@"%@%d", op2,1];}
}
- (IBAction)button3clicked:(id)sender {NSLog(@"3 clicked");if (op != '+' && op != '-'&& op != '*' && op != '/') {//1231op1 = [NSString stringWithFormat:@"%@%d", op1,1];}else{op2 = [NSString stringWithFormat:@"%@%d", op2,1];}}- (IBAction)add:(id)sender {op = '+';
}
- (IBAction)jieguo:(id)sender {if (op == '+') {//NSString转int整形数值int a1 = [op1 intValue];int a2 = [op2 intValue];int sum = a1 + a2;NSLog(@"%d", sum);NSString *result = [NSString stringWithFormat:@"%d", sum];self.jieguo.text = result;}
}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}@end

由于题目和思路累积的少, 所以应付这些题非常的吃力, 不过还好还有其他同学可以一起交流, 给我详细的讲解其中的原由, 这让我茅舍顿开, 希望以后大家继续保持这种学习状态, 一起讨论一起交流~~~

转载于:https://www.cnblogs.com/iOSCain/p/3978013.html