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─────Run-Time Library───────────────────────────────────────────────────────
 
/* FCVT.C illustrates floating-point-to-string conversion functions:
 *      _gcvt            _ecvt            _fcvt
 *
 * See MKFPSTR.C for an example of using the data returned by _fcvt
 * to build a formatted string. See ATONUM.C for an example of using
 * the string returned by _gcvt.
 */
 
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
 
void main()
{
    int decimal, sign;
    char *pnumstr;
    int precision = 7;
    char numbuf[50];
    double number1, number2;
 
    printf( "Enter two floating-point numbers: " );
    scanf( "%lf %lf", &number1, &number2 );
 
    /* With _gcvt, precision specifies total number of digits.
     * The decimal place and sign are inserted in the string.
     */
    _gcvt( number1 + number2, precision, numbuf );
    printf( "\nString produced by _gcvt: %s\n", numbuf );
    printf( "Total digits: %d\n", precision );
 
    /* With _ecvt, precision specifies total number of digits.
     * The decimal place and sign are provided for use in formatting.
     */
    pnumstr = _ecvt( number1 + number2, precision, &decimal, &sign );
    printf( "\nString produced by _ecvt: %s\nSign: %s\n",
             pnumstr, sign ? "-" : "+" );
    printf( "Digits left of decimal: %d\nTotal digits: %d\n",
             decimal, precision );
 
    /* With _fcvt, precision specifies digits after decimal place.
     * The decimal place and sign are provided for use in formatting.
     */
    pnumstr = _fcvt( number1 + number2, precision, &decimal, &sign );
    printf( "\nString produced by _fcvt: %s\nSign: %s\n",
             pnumstr, sign ? "-" : "+"  );
    printf( "Digits left of decimal: %d\nDigits after decimal: %d\n",
             decimal, precision );
}
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