Converting int digit into hex char - C programming

Question

Here is my code for converting int up to 15 into hex char:

static char intToHex(int i)
{
    switch (i)
    {
    case 0:
        return '0';
    case 1:
        return '1';
    case 2:
        return '2';
    case 3:
        return '3';
    case 4:
        return '4';
    case 5:
        return '5';
    case 6:
        return '6';
    case 7:
        return '7';
    case 8:
        return '8';
    case 9:
        return '9';
    case 10:
        return 'a';
    case 11:
        return 'b';
    case 12:
        return 'c';
    case 13:
        return 'd';
    case 14:
        return 'e';
    case 15:
        return 'f';
    default:
        break;
    }
}

Is there a way to write this nicer, without so many switch cases?

What I tried:

char * returnHex(int i) {

    char * hex = malloc(5);

    sprintf(hex, "%x", i);
    puts(hex);

    return hex; 
}

but this returns a char array not a char that I need. Thank you!

That is a one-liner: return (unsigned)i < 16 ? "0123456789abcdef"[i] : '\0'; — Lxer Lx
– Lxer Lx, Commented Dec 23, 2019 at 22:29

4386427 · Accepted Answer · 2019-12-23 20:37:49Z

2

Another way:

char intToHex(int i)
{
    return (i < 10) : '0' + i : 'a' + i - 10;
}

answered Dec 23, 2019 at 20:37

4386427

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Comments

Vlad from Moscow · Accepted Answer · 2019-12-23 20:21:34Z

0

Just declare a character array like

const char hex[] = "0123456789abcdef";

and use

if ( i < sizeof( hex ) - 1 )
{
    return hex[i];
}
else
{
    return hex[0];  // or ant other value
}

answered Dec 23, 2019 at 20:21

Vlad from Moscow

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