object-c 基本数据类型-1

       //数据类型：

        //整形（int、short int、long int、unsigned int、unsigned short、unsigned long）

        NSLog(@"整形:");

        NSLog(@"%lu",sizeof(int));//整形4个字节

        NSLog(@"%lu",sizeof(short int));//短整形2

        NSLog(@"%lu",sizeof(long int));//长整形8

        NSLog(@"%lu",sizeof(unsigned int));//无符号整形4

        NSLog(@"%lu",sizeof(unsigned short));//无符号短整形2

        NSLog(@"%lu",sizeof(unsigned long));//无符号长整形8

        //实形（float 、double 、long double）

        NSLog(@"实形:");

        NSLog(@"%lu",sizeof(float));//浮点形4

        NSLog(@"%lu",sizeof(double));//双精度形8

        NSLog(@"%lu",sizeof(long double));//长精度形16

        //字符型和字符串形 

        char a='a';

        char b=100;

        NSLog(@"%c,%c",a,b);

        NSLog(@"%i,%i",a,b);

        NSLog(@"我是字符串");//字符串形：@“我是字符串”

 

 

 

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