C 語言初學教材 - 第四章 管理使用者帳號 範例程式碼

範例程式碼



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#include <stdio.h>
#include <string.h>
 
#define SIZE 100
#define LEN 20
 
enum state {EXIT, RUN, WRONG_NAME, WRONG_CODE};
 
int main(void)
{
    // 宣告預設的帳號及密碼
    char userID[SIZE][LEN];
    char userCODE[SIZE][LEN];
     
    // 宣告暫存使用者輸入的帳號及密碼
    char inputName[LEN];
    char inputCode[LEN];
     
    // 宣告暫存新註冊的帳號及密碼
    char newName[LEN];
    char newCode[LEN];
     
    // 宣告暫存成功登入的帳號及密碼
    char whoName[LEN];
    char whoCode[LEN];
     
    // administrator 為預設的管理者帳號, 0000 為其密碼
    strcpy(userID[0], "administrator");
    strcpy(userCODE[0], "0000");
     
    // 宣告接收管理模式指令
    char instruction[LEN];
     
    // 宣告狀態變數、迴圈變數及陣列索引值變數
    int state, i;
    int counter;
     
    counter = 1;
    while (1) {
        state = WRONG_NAME;
         
        printf("login: ");
        scanf("%s", inputName);
         
        // "exit" 為內建指令,用來離開迴圈
        if (!strcmp(inputName, "exit")) {
            state = EXIT;
            printf("\n\n您將要離開本登入程式....\n\n");
            break;
        }
         
         
        // "new" 為內建指令,用來新建帳號密碼
        if (!strcmp(inputName, "new")) {
            state = RUN;
             
            printf("\n請輸入新的註冊帳號: ");
            scanf("%s", newName);
            printf("請輸入新的登入密碼: ");
            scanf("%s", newCode);
             
            strcpy(userID[counter], newName);
            strcpy(userCODE[counter], newCode);
            counter++;
             
            printf("\n新的帳號、密碼已建立,請重新登入....\n");
            continue;
        }
         
        // 從陣列中判斷是否有使用者輸入的帳號,若有才再繼續要求輸入密碼
        for (i = 0; i < SIZE; i++) {
            if (!strcmp(inputName, userID[i])) {
                printf("password: ");
                scanf("%s", inputCode);
                 
                if (i == 0 && !strcmp(inputCode, userCODE[i])) {
                    printf("\n\n您成功以管理員模式登入....\n");
                    printf("將入帳號管理模式,請在提示符號 # 後輸入指令\n");
                     
                    while (1) {
                        printf("\n# ");
                        scanf("%s", instruction);
                         
                        // exit 為離開管理模式的指令
                        if (!strcmp(instruction, "exit")) {
                            break;
                        }
                         
                        // list 為列印使用者列表的指令
                        if (!strcmp(instruction, "list")) {
                            printf("\n您即將開啟印出使用者帳號列表的功能....\n");
                            continue;
                        }
                         
                        // search 為查詢帳號指令
                        if (!strcmp(instruction, "search")) {
                            printf("\n您即將開啟查詢使用者帳號的功能....\n");
                            continue;
                        }
                         
                        // delete 為刪除帳號指令
                        if (!strcmp(instruction, "delete")) {
                            printf("\n您即將開啟刪除使用者帳號的功能....\n");
                            continue;
                        }
                         
                        // sort 為排序指令
                        if (!strcmp(instruction, "sort")) {
                            printf("\n您即將開啟排序使用者帳號列表的功能....\n");
                            continue;
                        }
                    }
                     
                    printf("\n\n您即將離開管理模式,請重新登入....\n\n");
                    state = RUN;
                    break;
                }              
                                 
                if (!strcmp(inputCode, userCODE[i])) {
                    strcpy(whoName, inputName);
                    strcpy(whoCode, inputCode);
                     
                    printf("\n\n哈囉, %s , 歡迎使用本登入程式...\n\n", whoName);
                    state = RUN;
                    break;
                }
                else {
                    state = WRONG_CODE;
                    break;
                }
            }
        }
         
        // 判斷目前狀態,顯示提示訊息
        if (state == RUN) {
            continue;
        }
        else if (state == WRONG_NAME) {
            printf("\n\n沒有這名使用者喔!請重新登入....\n\n");
            continue;
        }
        else if (state == WRONG_CODE) {
            printf("\n\n密碼錯誤,請重新登入....\n\n");
            continue;
        }
    }
     
    printf("\n\n程式即將關閉,所有建立的資料都會消失....\n\n");
     
    return 0;
}
 
/* 《程式語言教學誌》的範例程式
    檔名:nc3.c
    功能:利用 while 迴圈設計的登入系統
    作者:張凱慶
    時間:西元2010年7月 */


程式說明及編譯執行,請繼續參考




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