【Object C】基本数据类型

本文从Hello，Object-c 开始，通过程序介绍Object C 下常用数据类型

#import<Foundation/Foundation.h> //import不会重复包含头文件，include不会自动防止重复包含头文件
#include<stdio.h> //Oc 基本框架 Foundation/Foundation.h
#include"print.h" //在Oc程序中可以直接调用C语言函数

/*oc中使用的基本数据类型：一般数据类型，扩展的数据类型
   整形 int，char     扩展整形short(等价于short int),
                              long ( long int)
                              longlong( long long int )
                             unsigned short
                             unsigned long/long long

*/

intmain(intargc, const char * argv[]) {
    @autoreleasepool { //oc 创建内存池1
        // insert code here...
        NSLog(@"Hello, World!");
        NSLog(@"Hello,Object-c");
        hello();
        NSLog(@" ");

        int i = 12;
        NSLog(@"%i , %o , %x , %lu",i,i,i,sizeof(int));
        char c = 's';
        NSLog(@"%c , %lu",c,sizeof(char));
        short s = 50;
        NSLog(@"%hi , %ho , %hx , %lu",s,s,s,sizeof(short));
        long l = 40;
        NSLog(@"%li , %lo , %lx , %lu",l,l,l,sizeof(long));
        long long ll = 80;
        NSLog(@"%lli , %llo , %llx, %lu",ll,ll,ll,sizeof(longlong));
        unsigned short us = 10;
        NSLog(@"%hu , %ho , %hx , %lu",us,us,us,sizeof(unsignedshort));
        unsigned long ul = 19;
        NSLog(@"%lu , %lo , %lx , %lu",ul,ul,ul,sizeof(unsignedlong));
        unsigned long long ull = 100 ;
        NSLog(@"%llu , %llo , %llx , %lu",ull,ull,ull,sizeof(unsignedlonglong));


        float f = 300.1415926 ;
        double df = 300.1415926 ;
        long double ldf = 300.1415926;
        NSLog(@"f : %lu ,%f , %e ",sizeof(float),f,f);

NSLog(@"df : %lu ,%f , %e ",sizeof(double),df,df);

NSLog(@"ldf: %lu ,%Lf , %Le ",sizeof(longdouble),ldf,ldf);

(注意 1、long double 的转义符应该用大写的Lf/Le

2、float double can’t be signed or unsigned

}

return 0;

}

运行结果：

2014-11-24 10:39:58.608 Hello-Oc[773:303] Hello, World!
2014-11-24 10:39:58.610 Hello-Oc[773:303] Hello,Object-c
Hello C2014-11-24 10:39:58.611 Hello-Oc[773:303]
2014-11-24 10:39:58.611 Hello-Oc[773:303] 12 , 14 , c , 4(int)
2014-11-24 10:39:58.612 Hello-Oc[773:303] s , 1 (char)
2014-11-24 10:39:58.612 Hello-Oc[773:303] 50 , 62 , 32 , 2(short)
2014-11-24 10:39:58.613 Hello-Oc[773:303] 40 , 50 , 28 , 8(long)
2014-11-24 10:39:58.613 Hello-Oc[773:303] 80 , 120 , 50, 8 (long long)
2014-11-24 10:39:58.614 Hello-Oc[773:303] 10 , 12 , a , 2 ( unsigned short)

2014-11-24 10:39:58.615 Hello-Oc[773:303] 19 , 23 , 13 ,8 (unsigned long)

2014-11-24 10:39:58.615 Hello-Oc[773:303] 12 , 14 , c ,8 (unsigned long long)

2014-11-24 10:39:58.616 Hello-Oc[773:303] f :4 (float) ,300.141602 , 3.001416e+02

2014-11-24 10:39:58.616 Hello-Oc[773:303] df :8(double) ,300.141593 , 3.001416e+02

2014-11-24 10:39:58.617 Hello-Oc[773:303] ldf:16(long double) ,300.141593 , 3.001416e+02

【Object C】 基本数据类型

【Object C】基本数据类型