了解自己电脑的大小端模式

#include<stdio.h>
#include<iostream>

using namespace std;

typedef unsigned char *byte_pointer;

void show_bytes(byte_pointer start, size_t len) {
	size_t i;
	for (i = 0; i < len; i++) {
		printf(" %.2x", start[i]);
		printf("\n");
	}
	printf("\n");
}

void show_int(int x) {
	show_bytes((byte_pointer) &x,sizeof(int));
}

void show_float(float x) {
	show_bytes((byte_pointer)&x, sizeof(float));
}

void show_pointer(void *x) {
	show_bytes((byte_pointer)&x, sizeof(void *));
}

void test_show_bytes(int val) {
	int ival = val;
	float fval = (float)ival;
	int *pval = &ival;
	show_int(ival);
	show_float(fval);
	show_pointer(pval);
}

int main() {
	int val = 0x87654321;
	test_show_bytes(val);
	system("pause");
	return 0;
}

转载至深入理解计算机系统