CODEWITHSUNDEEP
c
Hmerac
Hmerac

Reputation: 187

Re-coding Toupper Function

I'm assigned to re-code toUpper and toLower functions. Do I have to write all of 26 alphabets in if statement like:

if ( char == 'a' )
return 'A';

or there is another simple way ?

Upvotes: 0

Views: 58

Answers (1)

GoBusto
GoBusto

Reputation: 4788

Lower-case ASCII characters are sequential, so it's a simple case of offsetting the character's value if it is within a given range:

#include <stdio.h>

int to_upper(int value) { return (value >= 'a' && value <= 'z') ? value - ('a'-'A') : value; }

int main(int argc, char *argv[])
{
    printf("%c and %c\n", to_upper('B'), to_upper('f'));
    return 0;
}

Try this code online here.

Upvotes: 1

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