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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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