字符串转int
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
@autoreleasepool {
NSString *result1=[[NSString alloc]init];
NSString *str2=[[NSString alloc]init];
NSString *str=[[NSString alloc]initWithString:@"158"];
NSString *str1=[[NSString alloc]initWithString:@"39"];
int num=[str intValue];
int num1=[str1 intValue];
int result=num-num1;
NSString *strResult1 = [NSString stringWithFormat:@"%d",result];
NSLog(@" %d ",result);
// 3取出符串“123-456-789-000”中的数字部分,组成一个新的字符串输出
//NSString *newstr3=[str3 stringByReplacingOccurrencesOfString:@"-" withString:@"" ]; 找到符号 替换成后一个
NSString *str3=@"123-456-789-000";
NSString *newstr3=[str3 stringByReplacingOccurrencesOfString:@"-" withString:@"" ];
NSLog(@"%@",newstr3);
//4放四个十进制三位数到一个数组中,然后按从小到大排序后组成一个新的数组
NSArray *arr=@[@"3",@"2",@"1"];
NSArray *arrNew=[arr sortedArrayUsingSelector:@selector(compare:)];
NSLog(@"%@",arrNew);
}
return 0;
}