Foundation基础 --- NSString类

//1.类(属性,方法)//2.能同通过这个类文件作为模板,来创建对象#import <Foundation/Foundation.h>int main(int argc, const char * argv[]) {    @autoreleasepool {    //创建一个字符串       NSString *str = @"ding";       NSLog(@"str %@",str);                NSString * str1 = [NSString stringWithFormat:@"%@,%@",@"a",@"b"];       NSLog(@"str3 %@",str1);            //char*转换为NSString类型的代码如下       char * c = "www";       NSString * str3 = [[NSString alloc] initWithCString:(const char*)c encoding:NSASCIIStringEncoding];       NSLog(@"str3 %@",str3);    }    return 0;}/* 打印结果 2015-07-08 11:25:02.965 NSString-summer[2501:379281] str ding 2015-07-08 11:25:02.966 NSString-summer[2501:379281] str3 a,b 2015-07-08 11:25:02.966 NSString-summer[2501:379281] str3 www*/