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util/rot.c

 

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/*

 

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 * An extremely simpleminded function. Read characters from stdin,

 

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 * rot13 them, and put them on stdout.  Totally unnecessary, of course.

 

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 */

 

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#include <stdio.h>

 

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#include <ctype.h>

 

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int main(void)

 

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{

 

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    char a, b;

 

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    while ((a = getchar()) != EOF)

 

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    {

 

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        if (isupper(a))

 

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            b = 'A' + (a - 'A' + 13) % 26;

 

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        else if (islower(a))

 

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            b = 'a' + (a - 'a' + 13) % 26;

 

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        else

 

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            b = a;

 

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        putchar(b);

 

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    }

 

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    exit(0);

 

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}

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