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ATONUM.C
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─────Run-Time Library───────────────────────────────────────────────────────
/* ATONUM.C illustrates string-to-number conversion functions including:
* atof atoi atol _gcvt
*
* It also illustrates:
* _cgets _cputs
*/
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#define MAXSTR 100
char cnumbuf[MAXSTR] = { MAXSTR + 2, 0 };
char tmpbuf[MAXSTR];
/* Numeric input and output without printf */
void main()
{
int integer;
long longint;
float real;
char *numbuf;
/* Using _cgets (rather than gets) allows use of DOS editing keys
* (or of editing keys from DOS command-line editors).
*/
_cputs( "Enter an integer: " );
numbuf = _cgets( cnumbuf );
_cputs( "\r\n" ); /* _cputs doesn't translate \n */
integer = atoi( numbuf );
strcpy( tmpbuf, numbuf );
strcat( tmpbuf, " + " );
_cputs( "Enter a long integer: " );
numbuf = _cgets( cnumbuf );
_cputs( "\r\n" );
longint = atol( numbuf );
strcat( tmpbuf, numbuf );
strcat( tmpbuf, " + " );
_cputs( "Enter a floating-point number: " );
numbuf = _cgets( cnumbuf );
_cputs( "\r\n" );
real = (float)atof( numbuf );
strcat( tmpbuf, numbuf );
strcat( tmpbuf, " = " );
_gcvt( integer + longint + real, 4, numbuf );
strcat( tmpbuf, numbuf );
strcat( tmpbuf, "\r\n" );
_cputs( tmpbuf );
}
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