C程序沒有給出正確的輸出

Question

我有以下代碼，要求用戶輸入正數天，然后要求用戶輸入該天的最高和最低溫度，但是在我運行該代碼后，我程序會要求輸入天數（s）它要求最高溫度，然后僅在不要求最低溫度和條件的情況下結束程序。 這是代碼。

#include <stdio.h>
int main(void) {

    int days,condt;
    double high,low,aver;

    printf("Weather Analyzer \n");
    printf("================ \n");

    printf("Please enter a positive number of days:");
    scanf("%d", &days);



    if (days <= 0) {

            while (days <= 0) {
                    printf("Please enter a positive number of days:");
                    scanf("%d", &days);
            }
    }



    printf("Enter today's high:");
    scanf("%.2f", &high);

    printf("Enter today's low:");
    scanf("%.2f", &low);

    printf("Enter today's condition: (s: sunny, c: cloudy, p: precipitation");
    scanf("%d", &condt);

    aver = high + low / 2.0;

    printf("Today's average temperature is: %.2f", aver);

}

這是確切的輸出：

Weather Analyzer
================
Please enter a positive number of days:3
Enter today's high:1
Enter today's low:Enter today's condition: (s: sunny, c: cloudy, p: precipitationToday's average temperature is: -0.00admin@machine:~/cprogram/weather>

Answer 1

這里high和low是double 。 將scanf "%.2f"更改為"%lf" 。 為了獲得適當的功能， condt聲明為char。 然后，您可以通過在scanf使用" %c"來獲取“ s”或“ c”值。

如果選擇將condt用作int則使用1或2來指定條件，例如：

 printf("Enter today's condition: (1: sunny, 2: cloudy, 3: precipitation"); 

然后檢查條件並進行計算。

Answer 2

嘗試這個;

#include <stdio.h>
int main(void) {

    int days;
    char condt;
    double high,low,aver;

    printf("Weather Analyzer \n");
    printf("================ \n");

    printf("Please enter a positive number of days:");
    scanf("%d", &days);



    if (days <= 0) {

            while (days <= 0) {
                    printf("Please enter a positive number of days:");
                    scanf("%d", &days);
            }
    }



    printf("Enter today's high:");
    scanf("%lff", &high);

    printf("Enter today's low:");
    scanf("%lff", &low);

    printf("Enter today's condition: (s: sunny, c: cloudy, p: precipitation");
    scanf(" %c", &condt);

    aver = high + low / 2.0;

    printf("Today's average temperature is: %llf \n", aver);
    system("pause");
}