我的代码有逻辑错误，我认为，如果我输入一个大于 max 的数字，则会显示错误 void，但它仍然继续进行 addOrder。我想循环它，如果用户输入无效，它将清除缓冲区并且用户将再次输入。你能帮我吗？
我的代码有逻辑错误，我认为，如果我输入一个大于 max 的数字，则会显示错误 void，但它仍然继续进行 addOrder。我想循环它，如果用户输入无效，它将清除缓冲区并且用户将再次输入。你能帮我吗？
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h> //for sleep function
//for color text
#define Reset_txt "\033[0m"
#define Red_txt "\033[0;31m"
#define Green_txt "\033[0;32m"
// Global variables
int userChoice;
char productNames[3][50];
double prices[3]; // this arrays used to stores the data price of different orders and prices
double payment = 0;
double userchanges[3];
double userMoney[3];
char Spag[50] = "Spaghetti";
char Pal[50] = "Palabok";
char Chic[50] = "Chicken";
int order = 0;
// Function to display an error message
void error()
{
printf(Red_txt "Invalid input!\n" Reset_txt);
return;
}
// Function to simulate ordering food
void loadingScreen()
{
int i;
printf("Loading: ");
for (i = 0; i < 20; ++i)
{
printf("*");
fflush(stdout);// Flush the standard output buffer to ensure the asterisk is visible
usleep(100000);// Introduce a delay of 100,000 microseconds (0.1 seconds)
}
// Provide a prompt for the user to order their meal
printf(Green_txt "\nOrder Successful!\n" Reset_txt);
}
// Display a loading animation
void orderFood()
{
int i;
printf("Loading: ");
for (i = 0; i < 20; ++i)
{
printf("*");
fflush(stdout);// Flush the standard output buffer to ensure the asterisk is visible
usleep(100000);// Introduce a delay of 100,000 microseconds (0.1 seconds)
}
// Provide a prompt for the user to order their meal
printf(" \nPlease order your meal.\n");
}
// Function to check if input is a valid number
int isValid(char *input)
{
// Check if the input is empty or consists of only whitespace
if (input == NULL || strspn(input, " \t\n") == strlen(input))
return 0;
char *endptr;
// Try to convert the input to a number (integer or floating-point)
strtod(input, &endptr);
// If the conversion reaches the end of the string (no error), it's a valid number
return *endptr == '\0';
}
// Function to get user input within a specified range
int getInp(char *inputType, int max) //max: The maximum allowed value for the input
{
// Declare an array to store user input and initialize a variable for valid input
char userInp[50];
int valid = 0;
while (!valid)
{
printf("%s", inputType); // Display the inputType prompt
// Read user input using fgets
if (fgets(userInp, sizeof(userInp), stdin) == NULL)
{
error();
continue;
}
// Remove newline character from user input
userInp[strcspn(userInp, "\n")] = 0;
if (isValid(userInp) == 1) // Check if the input is a valid number
{
valid = atoi(userInp); // Convert the valid input to an integer
if (valid < 0 || valid > max) // Check if the input is within the specified range
{
error(); // If not, display an error and continue the loop
continue;
}
else
{
break; // If valid input is received, break out of the loop
}
}
else
{
error(); // If the input is not a valid number, display an error and continue the loop
continue;
}
}
return valid; // Return the valid user input
}
void menu(int order)
{
orderFood();//void orderFood calling
printf("|=======================|\n");
printf("| Menu |\n");
printf("|=======================|\n");
printf("| Prices: |\n");
printf("| [1] Spaghetti: 150.00 |\n");
printf("| [2] Palabok: 120.00 |\n");
printf("| [3] Chicken: 160.00 |\n");
printf("|=======================|\n");
// Check if the userChoice is out of range
userChoice = getInp("Please select your order: ", 3); //max value 3
if (userChoice < 1 || userChoice > 3)
{
error();
}
switch (userChoice)
{
case 1:
strcpy(productNames[order], Spag); // Set the product name to Spaghetti
prices[order] = 150.00; // Set the price for Spaghetti
break; // Exit the switch statement
case 2:
strcpy(productNames[order], Pal); // Set the product name to Palabok
prices[order] = 120.00; // Set the price for Palabok
break; // Exit the switch statement
case 3:
strcpy(productNames[order], Chic); // Set the product name to Chicken
prices[order] = 160.00; // Set the price for Chicken
break; // Exit the switch statement
default:
// If the user enters an invalid choice
break; // Exit the switch statement
error();
getch();
system("cls");
menu(order);
}
AddOrder(); // Proceed to the next step, which is adding the order
}
// Function to ask if the user wants to add another order
void AddOrder()
{
int addOrder;
order++;
addOrder = getInp("Do you want to add another order? ([1] = Yes | [2] = No): ", 2); //maxvalue 2
// Check if addOrder is out of range
if (addOrder < 1 || addOrder > 2)
{
error(); // will call error if it doesn't meet the condition
getch(); // will read any char in keyboard
system("cls"); //to clear the console
menu(order); //calling the menu(order) void
}
else if (addOrder == 1) // if the user input 1 it will proceed to cls and menu(order)
{
system("cls");
menu(order);
}
else // if the user input 2 it will proceed to receipt
{
loadingScreen();
getch();
system("cls");
receipt();
}
}
// Function to display the receipt
void receipt()
{
// Initialize variables to store the total amount, user changes, and money
double TotalAmount = 0.0;
double Totaluserchanges = 0.0;
double TotalMoney = 0.0;
printf("==============================\n");
printf("Receipt: \n");
printf("==============================\n");
// Loop through each ordered item
for (int i = 0; i < order; i++)
{
printf("Food selected: %s\n", productNames[i], i + 1);//Print the selected food and its index
printf("Product price: P%.2lf\n", prices[i], i + 1); // Print the price of the selected food
TotalAmount += prices[i]; // Accumulate the total amount of the order
TotalMoney += userMoney[i]; Accumulate the total money received
Totaluserchanges += userchanges[i]; / Accumulate the total change for each order
}
printf("Total amount of product: P%.2lf\n", TotalAmount);
do
{
//the user ask to input money
printf("Enter the amount of money: ");
scanf("%lf", &TotalMoney);
if (TotalMoney < TotalAmount)
{
printf(Red_txt"Insufficient money\n"Reset_txt);//if the totalMoney is lessthan totalAmou
while(getchar() != '\n'); // Clear the buffer
}
else
{
Totaluserchanges = TotalMoney - TotalAmount; // to get the userchange
break; // get the total change of user
}
} while(1);
// Calculate the total user changes by iterating through each order
for (int i = 0; i < order; i++)
{
Totaluserchanges += userchanges[i];
}
// Display the total amounts and changes
printf("==========================\n");
printf("Total amount of product: P%.2lf\n", TotalAmount);//print the total amount of products
printf("Total amount of money: P%.2lf\n", TotalMoney); //total money of the user
printf("Total change: P%.2lf\n", Totaluserchanges); //total change of the user
}
int main()
{
menu(order);
}
在切换后的
menu()AddOrder()defaultbreak