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MKFPSTR.C
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─────Run-Time Library───────────────────────────────────────────────────────
/* MKFPSTR.C illustrates building and displaying floating-point strings
* without printf. Functions illustrated include:
* strcat strncat _cscanf _fcvt
*/
#include <stdlib.h>
#include <conio.h>
#include <string.h>
void main()
{
int decimal, sign;
int precision = 7;
char *pnumstr, numbuf[50] = "", tmpbuf[50];
double number1, number2;
_cputs( "Enter two floating-point numbers: " );
_cscanf( "%lf %lf", &number1, &number2 );
_putch( '\n' );
/* Use information from _fcvt to format number string. */
pnumstr = _fcvt( number1 + number2, precision, &decimal, &sign );
/* Start with sign if negative. */
if( sign )
strcat( numbuf, "-" );
if( decimal <= 0 )
{
/* If decimal is to the left of first digit (decimal negative),
* put in leading zeros, then add digits.
*/
strcat( numbuf, "0." );
memset( tmpbuf, '0', (size_t)abs( decimal ) );
tmpbuf[abs( decimal )] = 0;
strcat( numbuf, tmpbuf );
strcat( numbuf, pnumstr );
}
else
{
/* If decimal is to the right of first digit, put in leading
* digits. Then add decimal and trailing digits.
*/
strncat( numbuf, pnumstr, (size_t)decimal );
strcat( numbuf, "." );
strcat( numbuf, pnumstr + decimal );
}
_cputs( strcat( "Total is: ", numbuf ) );
}
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