从基础学习C语言(十六进制转十进制)

<pre name="code" class="cpp">// ConsoleApplication1.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"

int htoi(const char *s);
int _tmain(int argc, _TCHAR* argv[])
{
	printf("%d\n", htoi("0xa"));
	printf("%d\n", htoi("0xab"));
	printf("%d\n", htoi("0xabc"));
	printf("%d\n", htoi("0x0a0b"));
	printf("%d\n", htoi("a"));
	printf("%d\n", htoi("ab"));
	printf("%d\n", htoi("abc"));
	printf("%d\n", htoi("12ab"));
	getchar();//阻止黑框闪现
	return 0;
}

int htoi(const char *s){
	int n = 0;
	int t = 0;
	if(!s)return 0;

	if(*s == '0'){
		s++;
		if(*s == 'x' || *s == 'X'){
			s++;
		}
	}
	while (*s)
	{
		if(*s >= 'a' && *s <= 'z') t=*s-'a'+10;
		if(*s >= 'A' && *s <= 'Z') t=*s-'A'+10;
		if(*s >= '0' && *s <= '9') t=*s-'0';
		n=n*16+t;
		s++;
	}
	return n;
}
    原文作者:进制转换
    原文地址: https://blog.csdn.net/qiouyulei/article/details/38588327
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