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");
}