getnum.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#include <stdio.h>

getnum()
{
	int c, n;

	n = 0;
	while ((c=getchar()) >= '0' && c <= '9')
		n = n*10 + c - '0';
	if (c == EOF)
		return(-1);
	return(n);
}