Question

I want to output my floats without the ending zeros.

Example: float 3.570000 should be outputted as 3.57

and float 3.00000 should be outputted as 3.0 (so here would be the exception!)

Answer 1

A more efficient and (in my opinion) clearer form of paxdiablo’s morphNumericString(). Sorry not compiled or tested.

void morphNumericString( char *s )
{
    char *p, *end, *decimal, *nonzero;

    // Find the last decimal point and non zero character
    end = p = strchr(s,'\0');
    decimal = nonzero = NULL;
    while( p > s )
    {
        p--;
        if( !nonzero && *p!='0' )
        {
            nonzero = p;
        }
        if( !decimal && *p=='.' )
        {
            decimal = p;
            break;  // nonzero must also be non NULL, so stop early
        }
    }

    // eg "4.3000" -> "4.3"
    if( decimal && nonzero && nonzero>decimal )
        *(nonzero+1) = '\0';

    // eg if(decimal)  "4.0000" -> "4.0"
    //    if(!decimal) "4" -> "4.0"
    else
        strcpy( decimal?decimal:end, ".0" );
}