C与OC字符之间转换

//声明c语言字符串

    char *s = "Hello Objective-C";

    NSString*str =@"Hello";

// oc 、c 字符串类型转换

//c ----->oc

    NSString *str1 = [NSString stringWithUTF8String:s];

    NSLog(@"str1 = %@",s);

//oc ------>c

    NSLog(@"str2 =%s",[str UTF8String]);