OC-3

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////  main.m//  -OC-3////  Created by lanqs on 14/12/20.//  Copyright (c) 2014年 . All rights reserved.//#import <Foundation/Foundation.h>#import "Tools.h"typedef struct {    NSInteger num;    NSInteger score;}Student;int main(int argc, const char * argv[]) {    @autoreleasepool {#pragma mark - 1、将字符串中的数字去掉，字母转为大写：@“0go08o32d”//        NSString *string = @"0go08o32d";//        NSString *newstring = [string uppercaseString];//        NSMutableString *string1 = [NSMutableString stringWithFormat:@""];//新建一个空的可变字符串//        for (int i  = 0; i < string.length; i ++) {//            char ch = [newstring characterAtIndex:i];//            if (ch >= 'A' && ch <= 'Z' ) {//                [string1 appendFormat:@"%c",ch];//添加字符，组成字符串//            }//        }//        NSLog(@"%@",string1);#pragma mark - 2、写一个方法，计算任意一个身份证号对应的出生年月//        NSString *string = @"510681199310033513";//        [Tools showBirthday:string];#pragma mark - 3、写一个方法，将传入的NSString类型的字符串数值变为相反数字符串后返回，如传入@“1”，返回@“-1”。传入@“-12”，返回“12”；//        /*上面两个是测试用的*///        //NSString *string = @"-123123";//        //NSString *string = @"1a23123";//        NSString *string = @"123123";//        NSLog(@"%@", [Tools exchange:string]);#pragma mark - 4、已知一个字符串@“123abc123abc123”,将字符串中所有的@“123”替换为@“000”；//        NSString *string = @"123abc123abc123";//        NSString *newstring = [string stringByReplacingOccurrencesOfString:@"123" withString:@"000"];//        NSLog(@"%@",newstring);#pragma mark - 5、给定一个字符串，判断字符串中是否还有png，有就删除它//        NSString *string = @"map.pngklk";//        //        NSRange range = [string rangeOfString:@"png"];//       //        if (range.length != 0 && range.location != NSNotFound) {//         //删除//            //(我的理解把空的替换给他)//            NSString *newstring = [string stringByReplacingOccurrencesOfString:@"png" withString:@""];//            NSLog(@"%@",newstring);//        }else{//            NSLog(@"没有找到！");//        }#pragma mark - 6、给你一个字符串  helloworld 在hello后插入my//        NSString *string = @"helloworld";//        //        NSString *newstring = [string substringToIndex:5];//        NSString *newstring0 = [string substringFromIndex:5];//        //        NSString *newstring1 = [newstring stringByAppendingString:@"my"];//        //        NSString *newstring2 = [newstring1 stringByAppendingString:newstring0];//        NSLog(@"%@",newstring2);#pragma mark - 7、aaabbccccdd输出为3a2b4c2d//        NSString *string = @"aaabbccccdd";//        int number1=0,number2=0,number3=0,number4=0;//        for (int  i = 0; i < string.length; i ++) {//            char ch = [string characterAtIndex:i];//            if (ch == 'a') {//                number1 ++;//            }//            if (ch == 'b') {//                number2 ++;//            }//            if (ch == 'c') {//                number3 ++;//            }//            if (ch == 'd') {//                number4 ++;//            }//            //        }//        NSNumber *number10 = [NSNumber numberWithInt:number1];//        NSNumber *number11 = [NSNumber numberWithInt:number2];//        NSNumber *number12 = [NSNumber numberWithInt:number3];//        NSNumber *number13 = [NSNumber numberWithInt:number4];//        NSString *newstring = [NSString stringWithFormat:@"%@a%@b%@c%@d",number10,number11,number12,number13];//        NSLog(@"%@",newstring);#pragma mark - 8、写一个方法输入的字符是否包含数字0，不包含输出@“false”，包含输出其所在位置（多个输出第一个）；//        //        NSString *string = @"2120";//        [Tools zeroOfString:string];                    }        return 0;}

<pre name="code" class="objc">////  Tools.m//  -OC-3////  Created by lanqs on 14/12/20.//  Copyright (c) 2014年 All rights reserved.//#import "Tools.h"@implementation Tools+ (void)showBirthday:(NSString *)string{    NSString *newstring = [string substringWithRange:NSMakeRange(6, 8)];    NSLog(@"%@",newstring);}+ (NSString *)exchange:(NSString *)string{    //判定是否是字符串数值也就是只有0-9    NSInteger flag = 0;    for (int i = 0; i < string.length; i ++) {        char ch = [string characterAtIndex:i];        if (ch >='0' && ch <= '9') {            flag = 1;//判定是不是数字字符串        }    }    if (flag == 1) {        int  num = [string intValue];        num = -num;        NSString *string1 = [[NSString alloc]initWithFormat:@"%d" ,num];         return string1;    }else{            return @"-1";    }}+ (void)zeroOfString:(NSString *)string{    NSRange range = [string rangeOfString:@"0"];    if (range.location != 0 && range.length) {        NSLog(@"它的位置在第：%ld个字符",range.location+1);    }else {        NSLog(@"false");    }}@end

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