C 教程
C 語言實(shí)例 - 計(jì)算 int, float, double 和 char 字節(jié)大小
C 語言實(shí)例使用 sizeof 操作符計(jì)算int, float, double 和 char四種變量字節(jié)大小。
sizeof 是 C 語言的一種單目操作符，如C語言的其他操作符++、--等，它并不是函數(shù)。
sizeof 操作符以字節(jié)形式給出了其操作數(shù)的存儲大小。
實(shí)例
#include <stdio.h>
int main()
{
int integerType;
float floatType;
double doubleType;
char charType;
// sizeof 操作符用于計(jì)算變量的字節(jié)大小
printf("Size of int: %ld bytesn",sizeof(integerType));
printf("Size of float: %ld bytesn",sizeof(floatType));
printf("Size of double: %ld bytesn",sizeof(doubleType));
printf("Size of char: %ld byten",sizeof(charType));
return 0;
}
運(yùn)行結(jié)果：
Size of int: 4 bytes Size of float: 4 bytes Size of double: 8 bytes Size of char: 1 byte
計(jì)算 long long, long double 字節(jié)大小
實(shí)例
#include <stdio.h>
int main()
{
int a;
long b;
long long c;
double e;
long double f;
printf("Size of int = %ld bytes n", sizeof(a));
printf("Size of long = %ld bytesn", sizeof(b));
printf("Size of long long = %ld bytesn", sizeof(c));
printf("Size of double = %ld bytesn", sizeof(e));
printf("Size of long double = %ld bytesn", sizeof(f));
return 0;
}
運(yùn)行結(jié)果：
Size of int = 4 bytes Size of long = 8 bytes Size of long long = 8 bytes Size of double = 8 bytes Size of long double = 16 bytes其他擴(kuò)展