getopt未更改值C

这段代码应该使用getopt过滤学生列表。它根据学生的分数筛选CS、数学和物理学生。 这个switch case中的所有内容都使用getopt accept case v工作,它只需要将值设置为1,并过滤学生列表,以便只有CS和Math学生会在列表中。我不知道为什么它不起作用。我在书中找到了许多这样做的例子。

很抱歉,我知道代码很难看,我试着把它做得更好。

#include <stdio.h>
#include <stdlib.h>
#include <getopt.h> 
#include "zulassung.h"

int main(int argc, char *argv[]){

int percentageNeededToPassCS = 50; 
int percentageNeededToPassSecondSubject = 50;
int passingMinCS = 0;
int passingMinSecongSubject = 0;
int maxPoints = atoi(argv[1]);
int points;

int studentID;

int CheckV = 0;

char subject[20];
char option;


while((option = getopt(argc, argv,"i:m:v")) != EOF){
    switch(option){
        case 'i':
        percentageNeededToPassCS = atoi(optarg);
        break;
        case 'm':
        percentageNeededToPassSecondSubject = atoi(optarg);
        break;
        case 'v':
        checkV = 1;
        break;
        default: //The default dosen't work yet it's not needed
        printf("Unknown Option: '%s'\n", optarg);
        break;
    }
    argc -= optind;
    argv += optind;
}

passingMinCS = calculate_pointsneededtopass(maxPoints,percentageNeededToPassCS);
passingMinSecongSubject=calculate_pointsneededtopass(maxPoints,percentageNeededToPassSecondSubject);

printf("\t %d\n", CheckV);
while(scanf("%d %s %d", &studentID, subject, &points) == 3){
    if(checkV == 1){
        if(subject_is_cs_or_math(subject) == 1){
        if(filter_student(passingMinCS,passingMinSecongSubject,checkV,studentID,subject,points) == 1){
        printf("%d\n", studentID);
            }
        }
    }else{
    if(filter_student(passingMinCS,passingMinSecongSubject,checkV,studentID,subject,points) == 1){
        printf("%d\n", studentID);
    }
    }
}

return 0;
}