#import <Foundation/Foundation.h>int main(int argc, const char * argv[]) {@autoreleasepool {//1.对字符串“2015-09-01 08:19:10”操作，输出"08:19:10"。要求使用两种截取方式。//第一个
NSString *str=@"2015-09-01 08:19:10";NSRange range1=[str rangeOfString:@"08:19:10"];NSString *subStr=[str substringWithRange:range1];NSLog(@"第一题－－－－－－－（1）");NSLog(@"%@",subStr);NSString *substr1=[str substringFromIndex:range1.location];NSLog(@"第一题－－－－－－－(2)");NSLog(@"%@",substr1);/*2.数组中存取以下数据:@[@{@"name":@"陈丰",@"age":@"32"},@{@"name":@"孙明",@"age":@"24"},@{@"name":@"王明",@"age":@"12"},@{@"name":@"李西",@"age":@"50"}]1)按年龄进行排序(降序)，输出数据2）删除“陈丰”并输出数据*/NSDictionary *dic1=@{@"name":@"陈丰",@"age":@"32"};NSDictionary *dic2=@{@"name":@"孙明",@"age":@"24"};NSDictionary *dic3=@{@"name":@"王明",@"age":@"12"};NSDictionary *dic4=@{@"name":@"李西",@"age":@"50"};NSMutableArray *arr=[[NSMutableArray alloc]initWithObjects:dic1,dic2,dic3,dic4,nil];NSSortDescriptor *sorts=[[NSSortDescriptor alloc]initWithKey:@"age" ascending:YES];[arr sortUsingDescriptors:[NSArray arrayWithObjects:sorts, nil]];NSLog(@"第二题－－－－－－－（1）");NSLog(@"排序后－－－－－－－(升序)");for(NSDictionary *dic in arr){NSLog(@"%@,%@",[dic objectForKey:@"name"],[dic objectForKey:@"age"]);}NSLog(@"排序后－－－－－－－(降序)");NSSortDescriptor *sorts1=[[NSSortDescriptor alloc]initWithKey:@"age" ascending:NO];[arr sortUsingDescriptors:[NSArray arrayWithObjects:sorts1, nil]];for(NSDictionary *dic in arr){NSLog(@"%@ %@",dic[@"name"],dic[@"age"]);}NSLog(@"第二题－－－－－－－（2）");for(int i=0;i<[arr count];i++){NSDictionary *dic=arr[i];if([dic[@"name"] isEqual:@"陈丰"]){[arr removeObject:dic];}}for(NSDictionary *dic in arr){NSLog(@"%@ %@",dic[@"name"],dic[@"age"]);}}return 0;}