创建一个新的字符串

#import <Foundation/Foundation.h>

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

@autoreleasepool {

//创建一个字符串常量

NSString *[email protected]"字符串";

// 创建一个空的字符串对象

//实例方法

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

//类方法

NSString *str2=[NSString string];

//快速创建字符串

NSString *str3=[[NSString alloc]initWithString:@"zifuchuan"];

NSString *str4=[[NSString alloc]initWithString:str];

NSString *str5=[NSString stringWithString:@"zifuchuan"];

//格式化创建字符串

int num=23;

float  num1=12.3;

NSString *str6=[[NSString alloc]initWithFormat:@"%d",num];

NSString *str7=[[NSString alloc]initWithFormat:@"这个数字是:%d或%f",num,num1];

NSLog(@"%@",str6);

NSLog(@"%@",str7);

NSString *str8=[NSString stringWithFormat:@"%d,%f",num,num1];

NSLog(@"%@",str8);

}

return 0;

}