做自己的网站怎么赚钱,wordpress头像网站,自己怎么制作app软件,怎样提高网站的点击率sizeof是一个单目运算符#xff0c;它的运算对象是变量或数据类型#xff0c;运算结果为一个整数。运算的一般形式如下: sizeof(类型或变量名) 它只针对数据类型#xff0c;而不针对变量#xff01; 若运算对象为变量#xff0c;则所求的结果是这个变量占用的内存…sizeof是一个单目运算符它的运算对象是变量或数据类型运算结果为一个整数。运算的一般形式如下: sizeof(类型或变量名) 它只针对数据类型而不针对变量 若运算对象为变量则所求的结果是这个变量占用的内存空间字节数若运算对象是数据类型则所求结果是这种数据类型的变量占用的内存空间字节数。 sizeof是一个使用频率很高的操作符经常用来获取变量或数据类型所占用的内存空间的大小下面的程序显示了sizeof的用法。 #include stdio.h struct Student { int number; char name[8]; }; enum season{ spring,s ummer, fall, winter }; int main() { int a 10; float b 3.5; struct Student s1 {1, “zhangsan”}; enum season myseason; printf (the size of char is %d bytes\n,sizeof(char)); printf (the size of short is %d bytes\n,sizeof(short)); printf (the size of int is %d bytes\n,sizeof(int)); printf (the size of a is %d bytes\n,sizeof(a)); printf (the size of long is %d bytes \n,sizeof(long)); printf (the size of long long is %d bytes \n,sizeof(long long)); printf (the size of float is %d bytes \n,sizeof(float)); printf (the size of b is %d bytes \n,sizeof(b)); printf (the size of double is %d bytes \n,sizeof(double)); printf (the size of struct Student is %d bytes \n,sizeof(struct Student)); printf (the size of enum season is %d bytes \n, sizeof (enum season)); printf (the size of myseason is %d bytes \n, sizeof (myseason)); return 0; } 程序执行结果如下 linuxubuntu:~/book/ch4$ cc test.c –o test -Wall linuxubuntu:~/book/ch4$./test the size of char is 1 bytes the size of short is 2 bytes the size of int is 4 bytes the size of a is 4 bytes the size of long is 4 bytes the size of long long is 8 bytes the size of float is 4 bytes the size of b is 4 bytes the size of double is 8 bytes the size of struct Student is 12 bytes the size of enum season is 4 bytes the size of myseason is 4 bytes 从该结果中可以清楚地看到不同数据类型及变量所占的字节数读者应该熟悉这些结果。还可以看到变量所占用的空间由其数据类型决定与变量的值没有关系。转载于:https://www.cnblogs.com/wangjinshan/p/7063074.html
