#include <stdio.h>
#include <conio.h>
#include <string.h>

int i_mm(char *mm,int n)/* mm存放密码数组 n密码长度 */
{
    int i=0;
    char ch;
    while((ch = getch()) != 13) /* 回车确定 */
    {
        if(n == i)
            continue;
        if(8 == ch) /*退格清除*/
        {
            if(0 == i)
                continue;
            printf("\b \b");
            if(0 < i)
                i--;
            continue;
        }
        else /* 设置密码 */
        {
            mm[i]=ch;
            printf("*");
        }
        i++;
    }
    mm[i]='\0';
    return 0;
}

int main(int argc, char *argv[])
{
    char mm[32];

    memset(mm, 0x00, sizeof(mm));

    printf("请输入密码:");
    i_mm(mm, 12);
    printf("\n%s\n", mm);
    return 0;
}