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C/C++ Source Codes

programme to show use of ungetc()function i.e. to send something to buffer.

#include <stdio.h>
#include <ctype.h>

int main( void )
int i=0;
char ch;

puts("Input an integer followed by a char:");

/* read chars until non digit or EOF */
while((ch = getchar()) != EOF && isdigit(ch))
i = 10 * i + ch - 48; /* convert ASCII into int value */

/* if non digit char was read, push it back into input buffer */
if (ch != EOF)
ungetc(ch, stdin);

printf("i = %d, next char in buffer = %c\n", i, getchar());
return 0;

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