使用C類比ATM練習switch..case用法

標籤：執行個體   c   switch   

這個執行個體很簡單，看一下就能明白，至於我已經對C比較熟悉了，為什麼還要從這麼簡單的例子入手，這個需要再詳細的說明一下。由於之前學習C的時候，就是急功近利，沒有仔細的去品味C中，特別是指標中的一些樂趣，所以我選擇從基礎再學習一遍，就這樣咯。

#include <stdio.h>/** * 實現自動取款機介面的類比來學習使用switch語句 * switch...case語句的結構 * switch(int類型變數){ * case 1:   //如果是1，進行相應的處理 *  .... *  break; * case 2: *  .... *  break; * default:   //可有可無的，表示如果不是上面的所有 *  .... *  break; * } */int main(void){    do{        printf("===================================\n");        printf(":   Please select the key:        :\n");        printf(":   1: Query                      :\n");        printf(":   2: Credit                     :\n");        printf(":   3: Debit                      :\n");        printf(":   4: Return                     :\n");        printf("===================================\n");        int selected = 0;        scanf("%d",&selected);        switch(selected){        case 1:            printf("===================================\n");            printf(":  Your balance is $1000          :\n");            printf(":  Please enter any key to return :\n");            printf("===================================\n");            getch();            break;        case 2:            printf("===================================\n");            printf(": Please select credit money      :\n");            printf(": 1: $50                          :\n");            printf(": 2: $100                         :\n");            printf(": 3: return                       :\n");            printf("===================================\n");            int credit = 0;            scanf("%d",&credit);            switch(credit){            case 1:                printf("===================================\n");                printf(":  Your Credit money is $50       :\n");                printf(":  Please enter any key to return :\n");                printf("===================================\n");                getch();                break;            case 2:                printf("===================================\n");                printf(":  Your Credit money is $100      :\n");                printf(":  Please enter any key to return :\n");                printf("===================================\n");                getch();                break;            case 3:                break;            default:                printf("===================================\n");                printf(":  Op error!!                     :\n");                printf(":  Please enter any key to return :\n");                printf("===================================\n");                getch();                break;            }            break;        case 3:            printf("===================================\n");            printf(": Please select debit money       :\n");            printf(": 1: $50                          :\n");            printf(": 2: $100                         :\n");            printf(": 3: $500                         :\n");            printf(": 4: $1000                        :\n");            printf(": 5: return                       :\n");            printf("===================================\n");            int debit = 0;            scanf("%d",&debit);            switch(debit){            case 1:                printf("===================================\n");                printf(":  Your debit money is $50        :\n");                printf(":  Please enter any key to return :\n");                printf("===================================\n");                getch();                break;            case 2:                printf("===================================\n");                printf(":  Your debit money is $100       :\n");                printf(":  Please enter any key to return :\n");                printf("===================================\n");                getch();                break;            case 3:                printf("===================================\n");                printf(":  Your debit money is $500       :\n");                printf(":  Please enter any key to return :\n");                printf("===================================\n");                getch();                break;            case 4:                printf("===================================\n");                printf(":  Your debit money is $1000      :\n");                printf(":  Please enter any key to return :\n");                printf("===================================\n");                getch();                break;            case 5:                break;            default:                printf("===================================\n");                printf(":  Op error!!                     :\n");                printf(":  Please enter any key to return :\n");                printf("===================================\n");                getch();                break;            }            break;        case 4:            printf("===================================\n");            printf(":  Thank you for your using       :\n");            printf(":  Good Bye                       :\n");            printf("===================================\n");            return;        default:            return;        }    }while(1);    return 0;}

使用C類比ATM練習switch..case用法