#include "stdio.h"
  #include "conio.h"

  main()
  {
        char username;
        char userpass;
        int count=0;
        int issuccess=0;
        char initname[]={"admin"};
        char initpass[]={"1234"};
        for (;count<3;count++)
        {
         gets(username);
         gets(userpass);
         if(strcmp(username,initname)==0 && strcmp(userpass,initpass)==0)
         {
          issuccess=1;
          break;
        if(issuccess==1)
        printf("dengluchenggong");
        else
        printf("denglushibai");
        }
        }
        getch();

  }

#include "stdio.h"
#include "conio.h"
#include "string.h"
void main()
  {
    char username[10] = {0};
        char userpass[10] = {0};
        int count=0;
        int issuccess=0;
        char initname[]={"admin"};
        char initpass[]={"1234"};
        for (;count<3;count++)
        {
         gets(username);
         gets(userpass);
         if(strcmp(username,initname)==0 && strcmp(userpass,initpass)==0)
         {
            issuccess=1;            
         }
         if(issuccess==1)
        {
            printf("dengluchenggong\n");
            break;
        }
        else
        printf("denglushibai\n");
        }
        getch();

  }

楼主，登录上了么

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

  main()
  {
        char* username=NULL;
        char* userpass=NULL;
        int count=0;
        int issuccess=0;
        char initname[]={"admin"};
        char initpass[]={"1234"};
         username=(char*)malloc(10*sizeof(char));
         gets(username);
         getchar();
         userpass=(char*)malloc(10*sizeof(char));
         gets(userpass);
         if(strcmp(username,initname) && strcmp(userpass,initpass))
        printf("dengluchenggong");
        else
        printf("denglushibai");

  }

1、  char username[10] = {0};
     char userpass[10] = {0};
     这两句是什么意思啊？？？
 2、为什么for循环语句里面的变量总要先附一个值（有的等于0或1）？
比如：main()
     {
       int num=1;
       int sum=0;
       for(num=1;num<=10;num++)
       ......
      }

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

 int main()
  {
        char username[10];
        char userpass[10];
        int count=0;
        int issuccess=0;
        char initname[]={"admin"};
        char initpass[]={"1234"};
        for (;count<3;count++)
        {
         gets(username);
         gets(userpass);
         if(strcmp(username,initname)==0 && strcmp(userpass,initpass)==0)
         {
          issuccess=1;
        if(issuccess==1)
        printf("dengluchenggong");
        else
        printf("denglushibai");
        }
        }
        getch();

  }