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#include <ctype.h>
#include <stdio.h>
#define BUFSIZE 100
int getch(void);
void ungetch(int);
/* getint: get next integer from input into *pn */
int getint(int *pn)
{
int c, sign, sawsign;
while (isspace(c = getch())) /* skip white space */
;
if (!isdigit(c) && c != EOF && c != '+' && c != '-') {
ungetch(c); /* it's not a number */
return 0;
}
sign = (c == '-') ? -1 : 1;
if (sawsign = (c == '+' || c == '-'))
c = getch();
if (!isdigit(c)) {
ungetch(c);
if (sawsign)
ungetch((sign == -1) ? '-' : '+');
return 0;
}
for (*pn = 0; isdigit(c); c = getch())
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