i need to display an error message when someone tries to add the same roll no. for same class where the class and roll no. details are saved in file

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我寻月下人不归
我寻月下人不归 2021-02-14 00:58
int clrl()
{
    int rol;
    scanf("%d",&rol);
    char ch;
    while( ( ch = getchar() ) != \'\\n\' && ch != EOF );
    fs=fopen("student&qu         


        
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