使用 sizeof 操作符计算int, float, double 和 char四种变量字节大小。

sizeof 是 C 语言的一种单目操作符，如C语言的其他操作符++、--等，它并不是函数。

sizeof 操作符以字节形式给出了其操作数的存储大小。

实例

#include

int main()

{

int integerType;

float floatType;

double doubleType;

char charType;

// sizeof 操作符用于计算变量的字节大小

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;

}

运行结果：

Size of int: 4 bytes Size of float: 4 bytes Size of double: 8 bytes Size of char: 1 byte

计算 long long, long double 字节大小

实例

#include

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;

}

运行结果：

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