如果输入超过可用库存，则检查验证

Question

谁能帮我解决程序验证问题

我程序的实际输出:

选择1。导入 我输入了 2 次，我的第一个输入是 100 第二个输入是 200

所以查看时选择2。存储输出将是这个

Year    sets
 1      100
 2      200

入库共300台电脑

现在选择 3。卖单 我输入 400 所以它会显示 Sorry we have No enough Stocks !

我的问题是在查看我的 3 时。再次存储所有库存现在都是空的

Year    sets
 1        0
 2        0

我期望当我的输入超过可用库存时，它不会继续减少我存储中的库存

int main(void) {
    int choice = 0;
    int year = 1, i, com;
    int storage[99] = { 0 };

    for (;;) {
        clrscr();

        printf("Year %d\n\n", year);

        printf("1. Import\n");
        printf("2. Storage\n");
        printf("3. Sell Order\n");

        printf("\nchoice: ");

        scanf("%d", &choice);

        if (choice == 1) { // import
            clrscr();
            printf("Enter sets of computer's imported: ");
            scanf("%d", &storage[year]);
            year++;
        }
        if (choice == 2) { // storage
            clrscr();
            printf("Year    sets\n");

            for (i = 1; i < year; i++) {
                printf("%2d     %4d\n", i, storage[i]);
            }
            getch();
        }
        if (choice == 3) { //order
            printf("Enter Sets of Computer ordered: ");
            scanf("%d", &com);

            for (i = 0; com && i < 99; i++) {
                if (com <= storage[i]) {
                    storage[i] = storage[i] - com;
                    com = 0;
                } else {
                    com = com - storage[i];
                    storage[i] = 0;
                }
            }
            if (com > storage[i]) { // validation
                printf("Sorry we have No enough Stocks !");
                getch();
            }
        }
    }
}

Answer 1

你在计算你有多少存货之前就清空了存货。你想先加起来你有多少库存，检查你是否有足够的，然后如果你有足够的库存就清空

    if (choice == 3) { //order
        printf("Enter Sets of Computer ordered: ");
        scanf("%d", &com);

        for(i=0;i<99;i++)       //calculates the amount of stock you have
        {
            Total_Stock+=storage[i];
        }

        for (i = 0; com && i < 99; i++) {

            if(Total_Stock<com)     //If not enough stock it breaks the loop 
                                    //before subtracting the stock
            {
                printf("Not enough stock.\n");
                break;
            }
            if (com <= storage[i]) {
                storage[i] = storage[i] - com;
                com = 0;
            } else {
                com = com - storage[i];
                storage[i] = 0;
            }
        }