C语言字符型、整型和变量的长度

科技前沿 • 2025-04-07 11:39 • 阅读 43

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C语言通过使用sizeof运算符，可以判断出包括char型在内的所有数据类型的长度。

#include <stdio.h> int main(void){ 
    printf("zizeof(char) = %u\n", (unsigned)sizeof(char)); printf("zizeof(short) = %u\n", (unsigned)sizeof(short)); printf("zizeof(int) = %u\n", (unsigned)sizeof(int)); printf("zizeof(long) = %u\n", (unsigned)sizeof(long)); return 0; }

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运行结果：
在这里插入图片描述
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程序的运行结果因编译器和运行环境的不同而不用。但sizeof(char)必定为1。
short、int 和 long具有以下关系。
sizeof(short) ≤ sizeof(int) ≤ sizeof(long)
注：根据编译器的不同，也可能三者为同样长度。

讯享网#include <stdio.h> int main(void){ 
    int int_a, int_b; double double_a, double_b; printf("sizeof(int) = %u\n", (unsigned)sizeof(int)); printf("sizeof(double) = %u\n", (unsigned)sizeof(double)); printf("sizeof(int) = %u\n", (unsigned)sizeof(int_a)); printf("sizeof(double) = %u\n", (unsigned)sizeof(double_a)); printf("sizeof(int + int) = %u\n", (unsigned)sizeof(int_a + int_b)); printf("sizeof(int + double) = %u\n", (unsigned)sizeof(int_a + double_b)); printf("sizeof(double + double) = %u\n", (unsigned)sizeof(double_a + double_b)); return 0; }

运行结果：
在这里插入图片描述

C语言字符型、整型和变量的长度

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