Object-C,循环语句for,while,do-while

演示循环语句，for，while，do-while，和C系列的语言，语法基本一致1到10，求和

//
//  main.m
//  for-while
//
//  Created by fansunion on 15/11/29.
//  Copyright (c) 2015年 demo. All rights reserved.
//

#import <Foundation/Foundation.h>


int main(int argc, const char * argv[]) {
    @autoreleasepool {
       //for循环
        int number = 10;
        int sum =0;
        //int n = 0; 也可以在上面定义int变量n
        for(int n=1;n<=number;n++){
            sum += n;
        }
        NSLog(@"The sum is %i",sum);
        
        //while循环
        int  n2 = 1;
        int sum2 = 0;
        while(n2 <= 10){
            sum2 += n2;
            n2++;
        }
         NSLog(@"The sum2 is %i",sum2);
        
        //do-while循环
        int n3=1;
        int sum3=0;
        do{
            sum3 += n3;
            n3++;
        }while(n3<=10);
        NSLog(@"The sum3 is %i",sum3);
    }
    return 0;
}

程序输出

2015-11-29 14:25:08.975 for-while[2983:192052] The sum is 55

2015-11-29 14:25:08.977 for-while[2983:192052] The sum2 is 55

2015-11-29 14:25:08.978 for-while[2983:192052] The sum3 is 55

Program ended with exit code: 0