C语言题目。电脑小白完全懵逼[face]emoji:011.png[/face]

Question

C语言题目。电脑小白完全懵逼[face]emoji:011.png[/face]

Answer 1

#include <stdio.h>

int main()
{
    int n = 0;
    float sum = 0;
    while (1)
    {
        float g;
        printf("Enter a grade (0-100) [-1 to end]:\n");
        scanf("%f", &g);
        if (g == -1)
            break;
        else if (g > 100 || g < 0) 
        {
            printf("Marks out of range.\n");
            continue;
        }
        else if (g >= 80)
            printf("Excellent\n");
        else if (n >= 65)
            printf("Very Good\n");
        else if (g >= 50)
            printf("Average\n");
        else if (g >= 40)
            printf("Poor\n");
        else
            printf("Fail\n");
        
        ++n;
        sum += g;
    }
    
    
    printf("The total mark is %.2f, and the average is %.2f\n", sum, sum / n);
    
    return 0;    
}

// output:
Enter a grade (0-100) [-1 to end]:
10
Fail
Enter a grade (0-100) [-1 to end]:
60
Average
Enter a grade (0-100) [-1 to end]:
89
Excellent
Enter a grade (0-100) [-1 to end]:
-2
Marks out of range.
Enter a grade (0-100) [-1 to end]:
200
Marks out of range.
Enter a grade (0-100) [-1 to end]:
38
Fail
Enter a grade (0-100) [-1 to end]:
-1
The total mark is 197.00, and the average is 49.25