平行陣列打印收據

Question

我的程序是一個購物車程序，它接收UPC（物料ID），數量/重量並計算最終價格。該計劃必須打印出所有購買物品的收據。

的產品列表：

UPC Description    PST PPT  CIL 
4011 BANANAS    1  0.49 123.2 
4383 MINNEOLAS    1  0.79 187.3 
3144 TANGERINES    1  1.19 135.5 
4028 STRAWBERRIES_PINT  0  0.99 104 
4252 STRAWBERRIES_HALF_CASE 0  3.99 53 
4249 STRAWBERRIES_FULL_CASE 0  7.49 67 

UPC是項目碼 PST確定項是否被作爲單位或以重量出售 PPT是每單位/重量 價格CIL是庫存（不相干爲這個問題）

這些值存儲在並行數組中。

計劃：

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

/* 
Description: This program will simulate a checkout at a grocery store. User will input 
a UPC (item id) and a wieght/unit. The program will use parallel arrays to store these 
values and output a final price at the end. 
*/ 

int main(){ 
    int upc[6] = { 4011, 4383, 3144, 4028, 4252, 4249 }; 
    char desc[6][25] = { 
     "BANANAS    ", 
     "MINNEOLAS    ", 
     "TANGERINES   ", 
     "STRAWBERRIES_PINT  ", 
     "STRAWBERRIES_HALF_CASE", 
     "STRAWBERRIES_FULL_CASE" }; 
    int upcR[6] = {};//storage array for reciept 
    float pptR[6] = {};//storage array for reciept 
    char descR[6][25] = {};//storage array for reciept 
    int pst[6] = { 1, 1, 1, 0, 0, 0 }; 
    float ppt[6] = { 0.49, 0.79, 1.19, 0.99, 3.99, 7.49 }; 
    float stock[6] = { 123.2, 187.3, 135.5, 104, 53, 67 };//AKA CIL or Current Inventory Level 

    float quant[6] = {}; 
    float price[6] = {}; 

    int option; 
    do 
    { 
     printf("Welcome! Enter 1 to begin or 0 to exit.\n"); 
     scanf_s("%d", &option); 
     if (option == 1){ 
      float subtotal = 0; 
      float total = 0; 
      float quantity; 
      float discount1 = 0; 
      float discount2 = 0; 
      float tax = 0; 
      int input; 
      int element = -1; //element/row number 
      do 
      { 
       printf("Enter UPC item code or enter 0 to start a new purchase.\n"); 
       scanf_s("%d", &input); 
       if (input == 0) 
        break; 
       for (int i = 0; i < 6; i++)//Searches for element in parallel array using UPC 
       { 
        if (upc[i] == input) 
        { 
         element = i; 
         break; 
        } 
       } 
       if (element == -1){ // checks to see if UPC is valid 
        printf("Invalid UPC. Please try again.\n"); 
        continue; 
       } 
       if (pst[element] == 1)// checks if product is sold by units or weight 
       { 
        printf("Weight: "); 
        scanf_s("%f", &quantity); 
        quant[element] = quantity;//stores elements for reciept array 
        price[element] = quantity*ppt[element];//stores elements for reciept array 
        if (quantity > stock[element]){ 
         printf("This item is not available in this quantity.\n"); 
         continue; 
        } 
       } 
       else 
       { 
        printf("Units: "); 
        scanf_s("%f", &quantity); 
        if (quantity > stock[element]){ 
         printf("This item is not available in this quantity.\n"); 
         continue; 
        } 
       } 
       subtotal += quantity * ppt[element]; 
       stock[element] -= quantity; 

       quant[element] = 10;//stores elements for reciept array 
       price[element] = quantity*ppt[element];//stores elements for reciept array 
       upcR[element] = upc[element]; 
       pptR[element] = ppt[element]; 
       descR[element][25] = desc[element][25]; 
      } while (input != 0); 
      if (subtotal > 50) //5% discount for purchases over $50 
      { 
       discount1 = subtotal - (subtotal * 0.95); 
      } 
      int random = rand() % 10 + 1; 
      if (random == 1){//random 5% discount if random number generated is 1. 
       discount2 = subtotal - (subtotal * 0.95); 
      } 
      float discount = discount1 + discount2;//total 10% from >50 spent and/or random coupon 
      tax = subtotal*.0825;//tax 
      total = subtotal + tax - discount; 
      printf("\n\nUPC\tDescription\t\tPPT\tWeight/Units\tPrice\n"); 

      for (int i = 0; i < 6; i++){ 
       printf("%d \t", upcR[i]); 
       printf("%s \t", descR[i]); 
       printf("\t\t%.2f \t", ppt[i]); 
       printf("%.2f \t\t", quant[i]); 
       printf("%.2f \t\n", price[i]); 
      } 
      printf("\t\t\t\t\tSubtotal\t$%.2f\n", subtotal); 
      printf("\t\t\t\t\tDiscount\t$%.2f\n", discount); 
      printf("\t\t\t\t\tTax\t\t$%.2f\n", tax); 
      printf("\t\t\t\t\tTotal\t\t$%.2f\n", total); 
     } 
     else if (option == 0){ 
      break; 
     } 
     else 
      printf("You have entered an invalid option.\n"); 
    } 
while (option != 0); 
    printf("\n\nUPC\tDescription\t\tPST\tPPT\tCIL\n"); 
    for (int i = 0; i < 6; i++){ 
    printf("%d \t", upc[i]); 
    printf("%s \t", desc[i]); 
    printf("%d \t", pst[i]); 
    printf("%.2f \t", ppt[i]); 
    printf("%.2f \t\n", stock[i]); 
    } 
     system("Pause"); 
     return 0; 

} 

所以我在UPC進入和數量一遍又一遍，直到我做了檢查。問題是我需要以某種方式將這些交易存儲到數組中，以便在完成檢出後可以打印出收據。現在我所擁有的是每個列的收據單獨的數組，我將每個元素都設置到這個單獨的數組中，然後將其打印出來。這似乎不工作，因爲1）我不能將char數組複製到雙數組中，並且2）空數組都是0，我不想要。

有沒有更好的方法來做到這一點？如果有的話，我想建議如何將字符串從char數組複製到另一個數組，然後我會處理0。

下面是該方案的一個例子：

Welcome! Enter 1 to begin or 0 to exit. 
1 
Enter UPC item code or enter 0 to start a new purchase. 
4011 
Weight: 12.1 
Enter UPC item code or enter 0 to start a new purchase. 
4028 
Units: 4 
Enter UPC item code or enter 0 to start a new purchase. 
4383 
Weight: 8.3 
Enter UPC item code or enter 0 to start a new purchase. 
0 


UPC  Description    PPT  Weight/Units Price 
4011       0.49 10.00   5.93 
4383 M      0.79 10.00   6.56 
0  T      1.19 0.00   0.00 
4028       0.99 10.00   3.96 
0  S      3.99 0.00   0.00 
0        7.49 0.00   0.00 

             Subtotal  $16.45 
             Discount  $0.00 
             Tax    $1.36 
             Total   $17.80 

Welcome! Enter 1 to begin or 0 to exit. 
0 


UPC  Description    PST  PPT  CIL 
4011 BANANAS     1  0.49 111.10 
4383 MINNEOLAS    1  0.79 179.00 
3144 TANGERINES    1  1.19 135.50 
4028 STRAWBERRIES_PINT  0  0.99 100.00 
4252 STRAWBERRIES_HALF_CASE 0  3.99 53.00 
4249 STRAWBERRIES_FULL_CASE 0  7.49 67.00 
Press any key to continue . . . 

注：最終的陣列是不是收據，這只是天庫存的結束。它上面的數組是我需要幫助製作的收據。

Answer 1

當我更換所有出現{};與{0};。它馬上跑了。

例：

float quant[6] = {}; 

應該是：

float quant[6] = {0}; 

下面是一個例子輸出我得到了（你能告訴我它的缺失）

編輯解決意見：

添加if(upcR[] != 0)分支在這方面你的代碼：

 for (int i = 0; i < 6; i++){ 
      if(upcR[i] != 0)//add this condition test 
      { 
       printf("%d \t", upcR[i]); 
       printf("%s \t", descR[i]); 
       printf("\t\t%.2f \t", ppt[i]); 
       printf("%.2f \t\t", quant[i]); 
       printf("%.2f \t\n", price[i]); 
      } 
     } 

而且，你要分配DESCR []是不正確的方式。您不能使用=將一個字符串數組設置爲等於另一個字符串數組。 讓您的代碼如下變化：

  // descR[element][25] = desc[element][25]; 
      strcpy(descR[element], desc[element]); 

有了這些變化時，輸出現在看起來像這樣：