程序不断循环 - C++

Program keeps looping - C++

本文关键字：C++ 循环 程序      更新时间：2023-10-16

以下程序无法正常工作。它应该是一个计算游戏，不应该一遍又一遍地循环。我不太确定发生了什么。我尝试重新安排一些东西，但没有帮助。我注意到，在用户输入数字并回答问题后，即使它应该转到显示，它也会转到mainMenu。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
//Declaration Statement
double num1;
double num2;
double answer;
int choice;

void pauseProgram()
{
printf("nPress any key to continue...");
getchar();
}
//Function Title
void title(char * programTitle)
{
int len = strlen(programTitle);
system("cls");
printf("n");
for(int i=1; i<40 - len/2;i++) printf(" ");
printf("%sn",programTitle);
}
void intro()
{
title("Calculation Game");
printf("nThis program will test your math abilites");
pauseProgram();
}
void userInput()
{
title("Calculation Game");
printf("nPlease enter positive numbers onlyn");
printf("Enter a number:");
scanf("%lf",&num1);
getchar();
printf("Enter another number:");
scanf("%lf",&num2);
getchar();
printf("What is %lf + %lf?",num1,num2);
scanf("%lf",&answer);
if (num1<0 or num2<0)
{
printf("nSorry, you must enter a positive value! Please try again.");
userInput();
pauseProgram();
}
}
void display()
{
title("Calculation Game");
if (answer=num1+num2)
printf("nWow you got the right answern");
else if (answer!=num1+num2)
printf("nHmmm...maybe we should review this math concept again!n");
pauseProgram();
}
void goodbye()
{
title("Calculation Game");
printf("nFor further information call: 1-800-123-4567n"); 
pauseProgram();
}

void mainMenu()
{
title("Calculation Game");
printf("n1.tPlay Game");
printf("n2.tExitn");
printf("nEnter 1 or 2:");
scanf("%d",&choice);
getchar();
if (choice==1)
userInput();
if (choice=2)
goodbye();
if (choice!=1 or choice!=2);
{
printf("nPlease enter either 1 or 2! Please try again.");
mainMenu();
}
}
//Main program
int main()
{
do
{   
intro();
mainMenu();
userInput();
if (answer==num1+num2 or answer!=num1+num2)
{
display();
}
}while(1); 
goodbye();
}

正如我在评论中提到的，您可能会看到main()函数进入无限循环：

do {
...
} while (1)

在被告知之前，此循环不会停止。例如，您可以告诉程序在pauseProgram()函数中退出：

void pauseProgram()
{
printf("nPress any key to continue...");
getchar();
exit(0);
}

或在您的goodbye()函数中：

void goodbye()
{
title("Calculation Game");
printf("nGame designed by David Liubartn");   
printf("nFor further information call: 1-800-123-4567n"); 
pauseProgram();
exit(0);
}

最后，您可以在循环中的任何位置使用break指令以退出循环。

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