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Why is the main not terminating?

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In the given program, when compiled in Dev c++ and executed, the main does not terminate. is there any explanation to this? ( page 16, Dennis Ritchie)

#include<stdio.h>

main()

{

    int c;

    c=getchar();

    while(c!=EOF)

        {

            putchar(c);

            c=getchar();

       }

}


 

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