計算數組部分的平均值

Question

我想計算用戶輸入的高低溫度的平均值，並且可以包含的天數在1到4之間，但是我很難理解去做這件事。我寫的代碼產生了一個完全不相關的數字。這裏是我的代碼：

#include <stdio.h> 

int main (void) 
{ 
    int i; 
    int limit; 
    int day[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; 
    int high[10],low[10]; 

    printf("---===IPC Temperature Analyzer V2.0===---\n"); 

    printf("Please enter the number of days between 3 and 10, inclusive: "); 
    scanf("%d", &limit); 
    while (limit <= 2 || limit >= 11) { 
     printf("Invalid entry, please enter a number between 3 and 10, inclusive: "); 
     scanf("%d", &limit); 
    } 

    for(i = 0;i < limit; i++) { 
     printf("Day %d - High: ", day[i]); 
     scanf("%d", &high[i]); 
     printf("Day %d - Low: ", day[i]); 
     scanf("%d", &low[i]); 
    } 

    printf("\nDay Hi Low\n"); 
    for (i = 0; i < limit; i++) { 
     printf("%d %d %d\n", day[i], high[i], low[i]); 
    } 

    int max = 0; 
    int min = 0; 

    for (i = 0; i < limit; i++) { 
     if (high[max] < high[i]) 
      max = i; 
     if (low[min] < low[i]) 
      min = i; 
    } 

    printf("\nHighest temperature was: %d on day %d", high[max], day[max]); 
    printf("\nLowest temperature was: %d on day %d ", low[min], day[min]); 

    int n; 
    int avg = high[i] + low[i]/i; 

    printf("\nEnter a number between 1 and 4 to see the average temperature for the entered number of days, enter a negative number to exit\n"); 
    scanf("%d", &n); 

    while (n > 4) { 
     printf("Invalid entry, please enter a number between 1 and 4, inclusive: "); 
     scanf("%d", &n); 
    } 

    while (n < 0) { 
     printf("Goodbye!\n"); 
     exit(0); 
    } 

    for (i = 0; i < n; i++) { 
     printf ("The average temperature up to day %d is: %d", day[i], avg); 
    } 
    return 0; 
} 

Answer 1

我想你放錯地方的表達int avg = high[i] + low[i]/i，也是意義似乎不正確的對我說：

第一：我想你想打印的平均爲每個特定的一天，在循環i : 0..n-1，但你計算值只有一次外循環（也許你會覺得在你的地方是什麼i意味着

二：你有每天只有兩個值，即高與低，而不是i值，對嗎？所以得到一個特定d的平均溫度唉它應該是avg = (high[i] + low[i])/2。還要注意大括號，它會產生與代碼中不同的運算符優先級。如果你想計算一個特定日子的「整體」平均值，我會使公式明確，例如通過區分averageOfDay和overallAverage。

第三：你確定avg應該是int嗎？我會建議使用浮動。

float avgSum = 0.0; 
for (i = 0; i < n; i++) { 
    float avgOfDay = (high[i] + low[i])/2.0; 
    avgSum += avgOfDay; 
} 
float overallAvg = avgSum/n; 
printf ("The average temperature up to day %d is: %f", day[n-1], overallAvg);