整数int逆序，字符串逆序

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

@autoreleasepool {

//1.有个数 123456789，如何将这个数每一位数，从末尾开始依次放入一个数组中

//（那么这个新的数组的第一位元素9，一次类推）如果你成功了，将他们遍历出来

NSNumber *[email protected];

//NSArray *[email protected][@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9"];

NSString *str=[NSString stringWithFormat:@"%@",num];

NSMutableArray *mutArr=[NSMutableArray array];

for (int i=8; i>=0; i--) {

NSRange rang0;

rang0.location=i;

rang0.length=1;

NSString *str1=[[NSString alloc]init];

str1=[str substringWithRange:rang0];

[mutArr addObject:str1];

}

for(id xin in mutArr){

NSLog(@"%@",xin);

}

NSLog(@"????????????????????????????????????????????????????????");

//2.如何将字符串@“abc123xyz789”倒置

NSString *[email protected]"abc123.xyz789";

NSMutableString * mutstr1=[NSMutableString string];

for (int i=0; i<strD.length; i++) {

unichar c=[strD characterAtIndex:strD.length-i-1];

[mutstr1 appendFormat:@"%c",c];

}

str=mutstr1;

NSLog(@"%@",str);

NSLog(@"????????????????????????????????????????????????????????");

NSString *[email protected]"2013年05月05日";

NSRange rang;

rang.location=0;

rang.length=4;

NSString *new=[time substringWithRange:rang];

//NSLog(@"%@",new);

NSRange rang1;

rang1.location=8;

rang1.length=2;

NSString *new1=[time substringWithRange:rang1];

//NSLog(@"%@",new1);

NSRange rang2;

rang2.location=8;

rang2.length=2;

NSString *new2=[time substringWithRange:rang2];

//NSLog(@"%@",new2);

NSString *newStr=[new stringByAppendingFormat:@"-%@-%@",new1,new2];

NSLog(@"%@",newStr);

}

return 0;

}