有人可以告诉我我的代码有什么问题并尝试解释它吗？

Question

关闭。此题需要 details or clarity 。目前不接受答案。

---

想要改进这个问题吗？通过 editing this post 添加详细信息并澄清问题.

已关闭 7 年前。

Improve this question

有人可以帮助我，因为没有循环问题。

#include <stdio.h>

int main () 
{
    int counter = 0;
    int average= 0;
    int grade = 0;

    printf("Introduce grade:");
    grade=scanf("%d",&grade);
    counter++;

    while(grade > 0)
    {
        if (grade <0 && grade >100)
            printf("Invalid number");
        else
            average +=grade;
        counter++;
     }

     printf("average = %lf", average/counter);
 }          

Answer 1

可能的修复:

#include <stdio.h>

int main (void) /* it is better to add void */

{
    int counter = 0;
    int sum = 0; /* no average is here */
    int grade = 0;
    int check;


    for(;;) /* make it to an infinite loop, break later */

    {
        /* put this block inside the loop */
        printf("Introduce grade:");
        check = scanf("%d",&grade); /* don't assign scanf's return variable to grade, which deletes the grade read */
        if (check != 1) /* check if a integer was read */
        {
            puts("Invalid input. Panik!");
            return 1;
        }
        if (grade <= 0) /* !(grade > 0) */
        {
            break;
        }

        if (grade <0 || grade >100) /* && -> || */
        {
            printf("Invalid number");
        }
        else
        {
            sum += grade;
            counter++; /* made to be done only if grade>=0 && grade<=100 */
        }
    }

    printf("average = %lf", (double)sum/counter); /* add cast to double */

    return 0; /* it may be better to add return 0; */
}