变数命名的善意

这是一小段泡沫排序法的程序码，可是在说什麽呢?你可以试着阅读他，但千万不要勉强自己。

int main()
{
    int arr[10] = {99, 0, 10, 31, 0, 42, 70, 67, 0, 0};
    int i, j, n1, n2;
    printf("*seating*\n");
    for(int i = 0; i < 10; ++i){
        printf("%d ", arr[i]);
    }
    
    printf("\n");
    printf("***************\n");
    printf("Please input the seat (1~10) and 2-digit number(0 to end game)\n");
    scanf("%d %d", &n1, &n2);
    while(n2 != 0){
        if(arr [n1 - 1] == 0){
            arr[n1 - 1] = n2;
            printf("*seating*\n");
            for(int i = 0; i < 10; ++i){
                printf("%d ", arr[i]);
            }
            printf("\n");
            printf("***************\n");
            printf("Please input the seat (1~10) and 2-digit number(0 to end game)\n");
            scanf("%d %d", &n1, &n2);
        }
        else{
            printf("Sorry, seat is taken.\n");
            scanf("%d %d", &n1, &n2);
        }
    }
    
    printf("*seating*\n");
    bubble_sort(arr, 10);
    for(int i = 0; i < 10; ++i){
        printf("%d ", arr[i]);
    }
    printf("\n");
    printf("***************\n");
    
    return 0;
}

如果你跟我一样，看到n1、n2那边就受不了的，我能了解你的感受，但是目前的资讯量还不够给这两个变数一个合适的命名，往下看也许可以找到答案。

    int arr[10] = {99, 0, 10, 31, 0, 42, 70, 67, 0, 0};
    int i, j, n1, n2;
    printf("*seating*\n");
    for(int i = 0; i < 10; ++i){
        printf("%d ", arr[i]);
    }

这段程序码有排序前的阵列，四个之後会用到的变数i、j、n1、n2以及印出arr阵列内所有的值，可能一开始只是想展示arr有什麽东西吧。

    printf("\n");
    printf("***************\n");
    printf("Please input the seat (1~10) and 2-digit number(0 to end game)\n");
    scanf("%d %d", &n1, &n2);

喔~这边就明白多了，提示使用者输入seat和number，代表可能会在阵列中尝试放进一个值，这里告诉我们n1代表插入阵列的位置，n2代表插入的值，我们可以用seat代表n1，number代表n2。

    int arr[10] = {99, 0, 10, 31, 0, 42, 70, 67, 0, 0};
    int i, j, seat, number;
    printf("*seating*\n");
    for(int i = 0; i < 10; ++i){
        printf("%d ", arr[i]);
    }
    
    printf("\n");
    printf("***************\n");
    printf("Please input the seat (1~10) and 2-digit number(0 to end game)\n");
    scanf("%d %d", &seat, &number);

修改过後总算有点理解他想表达的事情了，首先先印出排序前阵列的所有值，再来提示使用者输入插入的位置和数值，但还有一个地方我不太满意的就是arr这个阵列的命名，既然都用seat当作位置的索引了，我想用seats(一堆位置)来取代arr可以更明确表达意图，也许你有其他想法也可以提供，但目前我想先用seats来重新修改一下全部的程序码。

int main()
{
    int seats[10] = {99, 0, 10, 31, 0, 42, 70, 67, 0, 0};
    int i, j, seat, number;
    printf("*seating*\n");
    for(int i = 0; i < 10; ++i){
        printf("%d ", seats[i]);
    }
    
    printf("\n");
    printf("***************\n");
    printf("Please input the seat (1~10) and 2-digit number(0 to end game)\n");
    scanf("%d %d", &seat, &number);
    while(number != 0){
        if(seats [seat - 1] == 0){
            seats[seat - 1] = number;
            printf("*seating*\n");
            for(int i = 0; i < 10; ++i){
                printf("%d ", seats[i]);
            }
            printf("\n");
            printf("***************\n");
            printf("Please input the seat (1~10) and 2-digit number(0 to end game)\n");
            scanf("%d %d", &seat, &number);
        }
        else{
            printf("Sorry, seat is taken.\n");
            scanf("%d %d", &seat, &number);
        }
    }
    
    printf("*seating*\n");
    bubble_sort(seats, 10);
    for(int i = 0; i < 10; ++i){
        printf("%d ", seats[i]);
    }
    printf("\n");
    printf("***************\n");
    
    return 0;
}

这样舒服多了，不用再去想n1代表索引、n2代表数字，程序码直接表达出他的意图，让我们可以更轻松阅读他，小细节的修改带来的便利性是会积累的，也能让阅读的人感受到你的善意，下一篇我们会往while回圈内探索(老实说一开始我没看懂while内在做什麽XD)，感谢你陪我到这里，我们下次见^ ^

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