我如何设置一个店一个变量，它是一个结构

Question

什么，我试图做的是存储管理员用户名和密码，这样我可以比较的用户类型是什么保存的东西，但我不明白里面如何存储并使用指针，我认为我应该使用strcpy的，但现在我只是困惑......抱歉，我希望解释了什么是我需要

#include <stdio.h> 
#include <stdlib.h> 

struct profile 
{ 

char First[15]; 
char Last[15]; 
char Pwd[10]; 
char UserName[10]; 
}; 

void main_menu(struct profile user[]); 
void admin_signIn(struct profile user[]); 
void userSignUp(struct profile user[]); 
void userSignOn(struct profile user[]); 
void quit(struct profile user[]); 
void admin_menu(struct profile user[]); 

int main(int argc, char *argv[]) 
{ 
    struct profile user[100]; 
    struct profile *puser; 
    puser=&user[0]; 
    puser.UserName[0] = "a"; 
//puser.Pwd = "password"; 


    main_menu(user); 


    system("PAUSE"); 
    return 0; 
} 

void main_menu(struct profile user[]) 
{ 
    int choice = 0; 

    printf("User Menu\n"); 
    printf("   \n"); 
    printf("1 - Admin Sign In\n"); 
    printf("2 - Sign Up\n"); 
    printf("3 - Sign On\n"); 
    printf("4 - Quit\n"); 
    printf("Enter Choice:"); 
    scanf("%d", &choice); 
    getchar(); 

    if (choice == 1) 
    admin_signIn(user); 
    else 
     if (choice == 2) 
      userSignUp(user); 
      else 
       if(choice == 3) 
       userSignOn(user); 
       else 
        if(choice == 4) 
        quit(0); 


} 

void admin_signIn(struct profile *puser) 
{ 
    int i=0; 
    char buff_in[20]; 
    //UserName="admin"; 
    //puser->Pwd = "password"; 
    //user[0].Last = "  "; 
    //user[0].UserName="admin"; 
    //user[0].Pwd="password"; 


    //do 
    //{ 
    printf("Enter admin user name:"); 
    fgets(buff_in,10,stdin); 
    strcmp((puser+i)->UserName,buff_in); 

    printf("Enter admin password:"); 
    fgets(buff_in,10,stdin); 
    strcmp((puser+i)->Pwd,buff_in); 
    i++; 
    fflush(stdin); 

    //printf("the user name is %s:", user[0].UserName); 

    //if(user[i].UserName==user[0].UserName && user[i].Pwd ==user[0].Pwd) 
       admin_menu(user); 
    else 
     printf("try again"); 
    // }while(i<2); 
} 

void userSignUp(struct profile user[]) 
{ 
    int i=0; 

do 
{ 
    printf("Enter user name that you would like to use:\n"); 
    gets(user[i].UserName); 
    //printf("enter user password:"); 
    //gets(user[i].Pwd); 
    i++; 


    }while(i<2); 
} 

void userSignOn(struct profile user[]) 
{ 
    printf("you are in the user sign on menu\n"); 
} 

void quit(struct profile user[]) 
{ 
    printf("the is the quit function\n"); 
} 

void admin_menu(struct profile user[]) 
{ 
    printf("you are in the admin menu\n"); 
} 

Answer 1

puser.UserName[0] = "a"; // This is wrong. Needs to be 'a' 

puser.UserName[0]是帮助类型char和"a"的类型是const char*。

使用strncpy -

strncpy(puser.Pwd, "password", strlen("password")); 

注：应该有足够的空间供源和空终止字符的目的地。