[Kar]

pawn Код:

formatInt(intVariable, iThousandSeparator = ',', iCurrencyChar = '$')
{
    static
        s_szReturn[ 32 ],
        s_szThousandSeparator[ 2 ] = { ' ', EOS },
        s_szCurrencyChar[ 2 ] = { ' ', EOS },
        s_iVariableLen,
        s_iChar,
        s_iSepPos,
        bool:s_isNegative
    ;
    
    format( s_szReturn, sizeof( s_szReturn ), "%d", intVariable );

    if(s_szReturn[0] == '-')
        s_isNegative = true;
    else
        s_isNegative = false;

    s_iVariableLen = strlen( s_szReturn );

    if ( s_iVariableLen >= 4 && iThousandSeparator)
    {
        s_szThousandSeparator[ 0 ] = iThousandSeparator;
        
        s_iChar = s_iVariableLen;
        s_iSepPos = 0;
        
        while ( --s_iChar > _:s_isNegative )
        {
            if ( ++s_iSepPos == 3 )
            {
                strins( s_szReturn, s_szThousandSeparator, s_iChar);
                
                s_iSepPos = 0;
            }
        }
    }
    if(iCurrencyChar) {
        s_szCurrencyChar[ 0 ] = iCurrencyChar;
        strins( s_szReturn, s_szCurrencyChar, _:s_isNegative );
    }
    return s_szReturn; // ALL credits go to Slice
}

TESTING:

pawn Код:

[30/03/2016 01:46:55] formatted: $3
[30/03/2016 01:46:55] formatted: -$3
[30/03/2016 01:46:55] formatted: $33
[30/03/2016 01:46:55] formatted: -$33
[30/03/2016 01:46:55] formatted: $338
[30/03/2016 01:46:55] formatted: -$338
[30/03/2016 01:46:55] formatted: $3,382
[30/03/2016 01:46:55] formatted: -$3,382
[30/03/2016 01:46:55] formatted: $33,822
[30/03/2016 01:46:55] formatted: -$33,822
[30/03/2016 01:46:55] formatted: $338,227
[30/03/2016 01:46:55] formatted: -$338,227
[30/03/2016 01:46:55] formatted: $3,382,273
[30/03/2016 01:46:55] formatted: -$3,382,273
[30/03/2016 01:46:55] formatted: $33,822,736
[30/03/2016 01:46:55] formatted: -$33,822,736

TEST CODE:

pawn Код:

new i = 0;
    while(i < 210000000)
    {
        i += random(9) + 1;
        printf("formatted: %s", formatInt(i));
        printf("formatted: %s", formatInt(i * -1));
        
        i *= 10;
    }