Question

您好我正在尝试在c中编写一个简单的数字猜谜游戏。如果玩家正确猜出了号码，程序会给出一条消息并询问玩家是否想要再玩一次。

当我编译代码时，它会生成随机数，让玩家猜出数字并检查数字是否正确。但是，如果玩家想要再玩一次，它就不会让玩家回答，而只是退出。我不知道为什么会这样。你能帮我么？

int main()
{ 

int number, guess_value,number_of_guesses;
char answer;

srand((unsigned)time(NULL));
number=rand() %100+1;

A:number_of_guesses=0;
while (guess_value != number){
    printf("\nEnter a number between 0 and 100\n");
    scanf("%d", &guess_value);      
    number_of_guesses++;
    if (guess_value == number){
        printf("Right !!! You win\n");
    }
    else if (guess_value > number){
        printf("\nYour guess is too high. Guess again");
    }
    else {printf("\nYour guess is too low. Guess again");
    }
}

printf("You guessed %d times !", number_of_guesses);

printf("Do you want to play again? y? n?");
scanf("%c", &answer);
if (answer == 'y'){ 
    goto A; /*return to to beginging*/
}
return 0;   
}

Answer 1

我认为问题在于您在初始化之前比较guess_value。

Answer 2

更正后的代码是：

int main()
{
    int number, guess_value,number_of_guesses;
    char answer;

    srand((unsigned)time(NULL));

    do
    {
        number=rand() %100+1;
        number_of_guesses=0;
        do
        {
            printf("\nEnter a number between 0 and 100\n");
            scanf("%d", &guess_value);
            number_of_guesses++;
            if (guess_value == number)
            {
                printf("Right !!! You win\n");
            }
            else if (guess_value > number)
            {
                printf("\nYour guess is too high. Guess again");
            }
            else
            {
                printf("\nYour guess is too low. Guess again");
            }
        }
        while (guess_value != number);

        printf("You guessed %d times !\n", number_of_guesses);

        printf("Do you want to play again? y? n?");

        scanf(" %c", &answer);
    }
    while (answer == 'y');

    return 0;
}

你的代码中有很多问题：

正如其他用户已经很好地解释的那样不要使用goto语句
您必须在循环进入游戏之前重置guess_value，或将循环更改为do{}while(guess_value != number)
您必须在％c格式说明符之前添加一个空格，以便在scanf("%d", &guess_value);
number变量必须是每个while (answer == 'y');循环的init。否则它总是使用相同的数字来猜测。

要更具体地说明第3点，您必须了解第一个scanf不使用用户输入的'\n'（回车键，输入键盘键）字符。当scanf返回到answer变量时，此char仍然在输入缓冲区中，直到执行第二个'\n'。最后，当您检查if (answer == 'y')时，条件始终为假。

Answer 3

避免使用goto语句。使用do-while而不是

do {
number=rand() %100+1;

number_of_guesses=0;
do {
    printf("\nEnter a number between 0 and 100\n");
    scanf("%d", &guess_value);      
    number_of_guesses++;
    if (guess_value == number){
        printf("Right !!! You win\n");
    }
    else if (guess_value > number){
        printf("\nYour guess is too high. Guess again");
    }
    else {printf("\nYour guess is too low. Guess again");
    }
} while (guess_value != number);

printf("You guessed %d times !", number_of_guesses);

printf("Do you want to play again? y? n?");
scanf("%c", &answer);
} while (answer == 'y');

这应该可以解决您的问题，它会在代码中循环，直到出现“y”之外的任何内容。

Answer 4

你的问题是你应该重置guess_value，而不会被执行

Answer 5

#include<stdio.h>                           
#include<stdlib.h>                        //for rand & srand function
#include<time.h>                          //for time obviously. 
 int main()
{ 
int number, guess_value,number_of_guesses;
char answer;

A:                                       //put label here, Generate rand val every time. 
srand((unsigned)time(NULL));
number=rand() %100+1;

guess_value=0;                           //reset the guess value.
number_of_guesses=0;

while (guess_value != number){
  printf("\nEnter a number between 0 and 100\n");
  scanf("%d", &guess_value);      
  number_of_guesses++;
  if (guess_value == number){
    printf("Right !!! You win\n");
  }
  else if (guess_value > number){
    printf("\nYour guess is too high. Guess again");
  }
  else {printf("\nYour guess is too low. Guess again");
  }
}

printf("You guessed %d times !", number_of_guesses);
printf("Do you want to play again? y? n?");

getchar();                               //use this to remove the \n.
scanf("%c", &answer);
if (answer == 'y'){
goto A; /*return to to beginging*/
}

return 0;   
}

scanf从输入缓冲区获取输入，每次用户点击输入时，\n都会进入缓冲区。执行此scanf功能后，请执行\n。

Answer 6

这有效：

#include <stdio.h> // Include

int main() { 
    int number, guess_value, number_of_guesses;
    char answer;

    A:  
    srand(time(NULL)); // Fix
    number = rand() %100+1;
    number_of_guesses = 0;
    while(guess_value != number) {
        puts("\nEnter a number between 0 and 100\n");
        scanf("%d", &guess_value);      
        number_of_guesses++;
        if (guess_value == number) {
            printf("Right !!! You win\n");
        }
        else if (guess_value > number) {
            printf("\nYour guess is too high. Guess again");
        }
        else {
            printf("\nYour guess is too low. Guess again");
        }
    }

    printf("You guessed %d times !\n", number_of_guesses);
    puts("Do you want to play again? y? n?");
    scanf("%s", &answer); // Fix
    if (answer == 'y'){ 
         goto A;
    }
    return 0;   
}

c中的简单猜谜游戏

6 个答案: