C語言數字轉化爲字符串

#include <stdio.h>



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

	}
	return i;
}
void reverse(char *str) //講字符串首尾顛倒
{
	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)//將字符串前面加上符號'-'
{
	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初始化爲0
	{
		buf[i] = 0;
	}
	int neg;//標誌位 ,0代表負數，1代表整數
	if (src>=0) //src爲正整數，講neg標誌位爲1
	{
		neg = 1;
	}
	else
	{
		src = 0 - src;
		neg = 0;
	}
	i = 0;
	while (1)
	{
		int n = src % 10;//求SRC與100的餘數
		buf[i] = n + 0x30;//講SRc與10的餘數轉化爲char類型
		i++;
		src /= 10;
		if (src ==0)
		{
			break;
		}
	}
	reverse(buf);//將字符串順序首尾顛倒
	if (neg == 0)//src爲負數，將轉化後的字符串前面添加'-'
	{
		strneg(buf);
	}
	return buf;
}
int main(int arg, char *agr[])
{
	int i = 76576578;
	printf("%s\n", myitoa(i));
	
	system("pause");
}