UMBC CS 201, Fall 05
scanf3
Our third example shows that scanf can be used to read in
several integers per line.
The value returned by scanf is actually the number of
variables successfully read.
If scanf encounters the end-of-file character (control-D on
UNIX), then it returns a -1.
The Program
<![CDATA[
/********************************************
** File: scanf3.c
** Author: R. Chang
** Modified by: S. Evans
** Date: 3/5/04
** Section: 01XX & 02XX
** EMail: bogar@cs.umbc.edu
**
** This program shows the return values
** given by scanf.
**********************************************/
#include <stdio.h>
int main ( )
{
int n1, n2, n3, numRead ;
printf("Enter three integers: ") ;
numRead = scanf("%d%d%d", &n1, &n2, &n3) ;
printf("n1 = %d, n2 = %d, n3 = %d, numRead = %d\n",
n1, n2, n3, numRead) ;
return 0;
}
]]>
The Sample Run
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linux3[91] % gcc -Wall -ansi scanf3.c
linux3[92] % a.out
Enter three integers: 123 456 789
n1 = 123, n2 = 456, n3 = 789, numRead = 3
linux3[93] %
linux3[93] % a.out
Enter three integers: 123 456 aaa
n1 = 123, n2 = 456, n3 = 134513643, numRead = 2
linux3[94] %
linux3[94] % !a
a.out
Enter three integers: 123 aaa 789
n1 = 123, n2 = 134518072, n3 = 134513643, numRead = 1
linux3[95] %
linux3[95] % !a
a.out
Enter three integers: abc
n1 = 134518092, n2 = 134518072, n3 = 134513643, numRead = 0
linux3[96] %
linux3[96] % !a
a.out
Enter three integers: ^D
n1 = 134518092, n2 = 134518072, n3 = 134513643, numRead = -1
linux3[97] %
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Monday, 26-Sep-2005 11:20:21 EDT
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