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personnel 2001-05-14
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/* UNGETC.C: This program first converts a character
* representation of an unsigned integer to an integer. If
* the program encounters a character that is not a digit,
* the program uses ungetc to replace it in the stream.
*/
#include <stdio.h>
#include <ctype.h>
void main( void )
{
int ch;
int result = 0;
printf( "Enter an integer: " );
/* Read in and convert number: */
while( ((ch = getchar()) != EOF) && isdigit( ch ) )
result = result * 10 + ch - '0'; /* Use digit. */
if( ch != EOF )
ungetc( ch, stdin ); /* Put nondigit back. */
printf( "Number = %d\nNextcharacter in stream = '%c'",
result, getchar() );
}
Output
Enter an integer: 521a
Number = 521
Nextcharacter in stream = 'a'
* representation of an unsigned integer to an integer. If
* the program encounters a character that is not a digit,
* the program uses ungetc to replace it in the stream.
*/
#include <stdio.h>
#include <ctype.h>
void main( void )
{
int ch;
int result = 0;
printf( "Enter an integer: " );
/* Read in and convert number: */
while( ((ch = getchar()) != EOF) && isdigit( ch ) )
result = result * 10 + ch - '0'; /* Use digit. */
if( ch != EOF )
ungetc( ch, stdin ); /* Put nondigit back. */
printf( "Number = %d\nNextcharacter in stream = '%c'",
result, getchar() );
}
Output
Enter an integer: 521a
Number = 521
Nextcharacter in stream = 'a'
l_little 2001-05-14
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