C数据类型

常见的数据类型及其所占字节数

整型：byte(字节型，占1字节)、short(短整型，占2字节)、int(整型，占4字节)、long(长整型，占8字节）

    一般整型取值范围是分为有符号取值和无符号取值两种，有符号取值就把第一位取为符号位，无符号取值默认为大于等于0的整数。

    例如：int 占4字节，一字节是8位，总共就是32位，它的有符号取值范围就是-2^31^  ~  2^31^-1  无符号取值为0  ~  2^32^-1
浮点型：float(单精度浮点数，占4字节)、double(双精度浮点数，占8字节)

​ 注：Java浮点数默认类型是double，float浮点数后缀为F(或f)

布尔型：boolean(布尔型)，只有true 和false两个取值

字符型：char(字符型，占2个字节)

​ 注：因字符类型表示Unicode字符，所以一个字符占2字节

//可以使用以下代码进行测试
#include<stdio.h>

int main()
{
	printf("int = %ld\n", sizeof(int));
	printf("char = %ld\n", sizeof(char));
	printf("short = %ld\n", sizeof(short));
	printf("long = %ld\n", sizeof(long));
	printf("float = %ld\n", sizeof(float));
	printf("double = %ld\n", sizeof(double));
	printf("unsigned  int = %ld\n", sizeof(unsigned int));
	printf("unsigned char = %ld\n", sizeof(unsigned char));
	printf("unsigned short = %ld\n", sizeof(unsigned short));
	printf("unsigned long = %ld\n", sizeof(unsigned long));
	//float 和 double类型不能为unsigned

	//        int = 4
	//		char = 1
	//		short = 2
	//		long = 4
	//		float = 4
	//		double = 8
	//		unsigned  int = 4
	//		unsigned char = 1
	//		unsigned short = 2
	//		unsigned long = 4

		return 0;
}