C 教师使用分级计划

Question

我正在尝试编写一个程序，以便老师可以输入一个数字，然后它将输出相应的 C 字母顺序成绩。这是我到目前为止所拥有的，我正在尝试使控制台程序保持打开状态，直到教师输入 exit 或单击 X 图标。我很感激任何帮助。

#include <stdio.h>
#include<stdlib.h>
#define exit -1

int main(void) {

    int grade;


    printf("Enter student grade: ");
    scanf_s("%d", &grade);
    printf("Students grade is: %d", grade);

    while (grade != exit) {

        if (grade < 65)
        {
            printf("\nStudent grade is: F\n");
        }
        else if (grade <= 69)
        {
            printf("\nStudent grade is: D\n");
        }
        else if (grade <= 79)
        {
            printf("\nStudent grade is: C\n");
        }
        else if (grade <= 89)
        {
            printf("\nStudent grade is: B\n");

        }
        else if (grade <= 100)
        {
            printf("\nStudent grade is: A\n");
        }
        else if (grade == exit) {
        #define EXIT_SUCCESS 0;
        }
        break;
    }
    printf("Enter student grade: ");
    scanf_s("%d", &grade);
    printf("Students grade is: %d", grade);
    return 0;
}

Answer 1

已经解决了，谢谢你的帮助。

#include <stdio.h>
#include<stdlib.h>
#define exit -1

int main(void) {

    int grade;


    printf("Enter student grade , or '-1' to exit \n");
    scanf_s("%d", &grade);
    while (grade != exit) {
        printf("Students grade is: %d", grade);
        if (grade < 65)
        {
            printf("\nStudent grade is: F\n");
        }
        else if (grade <= 69)
        {
            printf("\nStudent grade is: D\n");
        }
        else if (grade <= 79)
        {
            printf("\nStudent grade is: C\n");
        }
        else if (grade <= 89)
        {
            printf("\nStudent grade is: B\n");

        }
        else if (grade <= 100)
        {
            printf("\nStudent grade is: A\n");
        }
        else if (grade == exit) {
            exit;
        }
        printf("Enter student grade , or '-1' to exit \n");
        scanf_s("%d", &grade);
    }
    fgetc(stdin);
    return 0;
}