C 語言實例 - 計算 int, float, double 和 char 字節大小

C 語言實例 - 計算 int, float, double 和 char 字節大小

C 語言實例 C 語言實例

使用 sizeof 操作符計算int, float, double 和 char四種變量字節大小。
sizeof 是 C 語言的一種單目操作符，如C語言的其他操作符++、--等，它並不是函數。
sizeof 操作符以字節形式給出了其操作數的存儲大小。
實例
#include <stdio.h>
 
int main()
{
    int integerType;
    float floatType;
    double doubleType;
    char charType;
 
    // sizeof 操作符用於計算變量的字節大小
    printf("Size of int: %ld bytes\n",sizeof(integerType));
    printf("Size of float: %ld bytes\n",sizeof(floatType));
    printf("Size of double: %ld bytes\n",sizeof(doubleType));
    printf("Size of char: %ld byte\n",sizeof(charType));
 
    return 0;
}
運行結果：
Size of int: 4 bytes
Size of float: 4 bytes
Size of double: 8 bytes
Size of char: 1 byte
計算 long long, long double 字節大小
實例
#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 bytes\n", sizeof(b));
    printf("Size of long long = %ld bytes\n", sizeof(c));
 
    printf("Size of double = %ld bytes\n", sizeof(e));
    printf("Size of long double = %ld bytes\n", sizeof(f));
 
    return 0;
}
運行結果：
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