[英]function return multi value to main function
這段代碼是我主要代碼的一部分,在這部分中,用戶輸入的每個產品代碼,數量和總價格都會增加,最后,用戶將totalSum,quantity1,quantity2,quantity3,quantity4返回到main函數,然后繼續打印收據,我知道要返回main函數必須這樣做z= getTotalSum()
。 但如何多回報? (目前我把它作為0,因為我不知道怎么放)
#include <stdio.h>
int getTotalSum (void); // when user selected product will calculate sum,quantity of each product
int main ()
{
getTotalSum();
return 0;
}
int getTotalSum (void)
{
int code;
float sum=0,totalSum,quantity1=0,quantity2=0,quantity3=0,quantity4=0;
while(1)
{
printf("Enter a product code.(Enter 5 to get total sum)\n");
scanf("%d",&code);
switch(code)
{
case 1:
{
quantity1=( quantity1 + 1);
sum=( 45.20 + sum);
printf("Current Sum: RM%.2f\n",sum);
break;
}
case 2:
{
quantity2=( quantity2 + 1);
sum=(14.50 + sum);
printf("Current Sum: RM%.2f\n",sum);
break;
}
case 3:
{
quantity3=( quantity3 + 1);
sum=(3.45 + sum);
printf("Current Sum: RM%.2f\n",sum);
break;
}
case 4:
{
quantity4=( quantity4 + 1);
sum=(7.80 + sum);
printf("Current Sum: RM%.2f\n",sum);
break;
}
case 5:
totalSum= sum;
printf("+--------------+--------------------+----------+\n");
printf("| Product Code | Rentail Price (RM) | Quantity |\n");
printf("+--------------+--------------------+----------+\n");
printf("| 1 | 45.20 | %.f |\n",quantity1);
printf("+--------------+--------------------+----------+\n");
printf("| 2 | 14.50 | %.f |\n",quantity2);
printf("+--------------+--------------------+----------+\n");
printf("| 3 | 3.45 | %.f |\n",quantity3);
printf("+--------------+--------------------+----------+\n");
printf("| 4 | 7.80 | %.f |\n",quantity4);
printf("+--------------+--------------------+----------+\n");
printf("Total Sum: RM%.2f\n",totalSum);
return 0;
}
}
}
您可以使用幾種方法來return
多個值:
return
一個struct
struct
每個例子如下:
1
struct data
{
int one;
int two;
int three;
int four;
};
struct data getTotalSum(void)
{
...
}
2
void getTotalSum(int *one, int *two, int *three, int *four)
{
...
}
3
struct data
{
int one;
int two;
int three;
int four;
};
void getTotalSum(struct data *d)
{
...
}
4
void getTotalSum(int *array)
{
...
}
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