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;}</foundation>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