comma separated expression in while loop in C

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The two loops given don’t have the same meaning. By using the comma operator in that way, the author was able to specify code that should be executed every iteration, even if the loop itself is never entered. It’s more like a do ... while () loop, or something like the following:

 printf("> ");
 fgets(str, 100, stdin);
 while(!feof(stdin)) {
    ..
    ..

    printf("> ");
    fgets(str, 100, stdin);
 }

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