C隨機數產生垃圾值

Question

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

int main() {

    srand(time(0)); 

    int random = 0, guess, guesses = 1;
    random = rand() % 100 + 1;
    printf("The number has been generated. Input 0 to quit.\n");
    do {
        scanf("%d", &guess); //takes user input for guess
        if (guess > random && guess != 0)
            printf("Lower!\n");
        else
        if (guess < random && guess != 0)
            printf("Higher!\n");
        else
        if (guess == random) {
            printf("Bingo!");
            return 0;
        } else
        if (guess == 0) {
            printf("Thanks for playing, the number was %d\n", &random);
            return 0;
        }
        guesses++;
    } while (guesses != 6); //maximum of 5 guesses

    printf("Thanks for playing, the number was %d\n", &random);

    return 0;
}

每當我在已生成數字的情況下顯示隨機變量時，就會輸出垃圾值。 但是該代碼段可以檢查猜測值和隨機數之間的比較，但我似乎無法正確輸出隨機數。

Answer 1

printf %d需要一個int數據類型的參數。 您正在傳遞int *數據類型（ &random ）。
在最后兩個printf中將& random刪除。

printf("Thanks for playing, the number was %d\n", random);

Answer 2

您應該傳遞random的值而不是其地址：

printf("Thanks for playing, the number was %d\n", random);

另請注意，您應該檢查scanf()的返回值：如果鍵入字母，程序將具有未定義的行為，它可能會在迭代5次后退出，或者永遠迭代或完全執行其他操作...

這是一個改進的版本：

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

int main(void) {
    int random, guess, guesses;
    srand(time(0)); 

    random = rand() % 100 + 1;
    printf("The number has been generated. Input 0 to quit.\n");
    for (guesses = 0; guesses < 5; guesses++) {
        // take user input for guess
        if (scanf("%d", &guess) != 1 || guess == 0)
            break;

        if (guess > random) {
            printf("Lower!\n");
        } else
        if (guess < random) {
            printf("Higher!\n");
        } else {
            printf("Bingo!\n");
            return 0;
        }
    }

    printf("Thanks for playing, the number was %d\n", random);

    return 0;
}