C语言数字转化为字符串

#include <stdio.h>



int len(char *str)
{
	int i = 0;
	while (str[i])
	{
		i++;

	}
	return i;
}
void reverse(char *str) //讲字符串首尾颠倒
{
	int i_len = len(str);
	char tmp = 0;
	int i = 0;
	for (; i < (i_len / 2);i++)
	{
		tmp = str[i];
		str[i] = str[i_len - 1 - i];
		str[i_len - 1 - i] = tmp;
	}
}
void strneg(char *str)//将字符串前面加上符号'-'
{
	int i_len = len(str);
	int i = i_len - 1;
	for (; i >= 0;i--)
	{
		str[i + 1] = str[i];
	}
	str[0] = '-';
}
const char *myitoa(int src)
{
	static char buf[128];
	int i = 0;
	for (; i < sizeof(buf);i++)//把buf初始化为0
	{
		buf[i] = 0;
	}
	int neg;//标志位 ,0代表负数，1代表整数
	if (src>=0) //src为正整数，讲neg标志位为1
	{
		neg = 1;
	}
	else
	{
		src = 0 - src;
		neg = 0;
	}
	i = 0;
	while (1)
	{
		int n = src % 10;//求SRC与100的余数
		buf[i] = n + 0x30;//讲SRc与10的余数转化为char类型
		i++;
		src /= 10;
		if (src ==0)
		{
			break;
		}
	}
	reverse(buf);//将字符串顺序首尾颠倒
	if (neg == 0)//src为负数，将转化后的字符串前面添加'-'
	{
		strneg(buf);
	}
	return buf;
}
int main(int arg, char *agr[])
{
	int i = 76576578;
	printf("%s\n", myitoa(i));
	
	system("pause");
}