revise answer

Author: fsaadatmand

chapter05/5-1.c

@@ -10,15 +10,14 @@
 #include <ctype.h>
 
 #define BUFSIZE  100
-#define SIZE     100
 
 /* functions */
 int  getch(void);
 void ungetch(int);
 int  getint(int *);
 
 /* global */
-int    buf[BUFSIZE];         /* buffer from ungetch */
+int    buf[BUFSIZE];         /* buffer from ungetch (can handle EOF push back) */
 int    bufp = 0;             /* next free position in buf */
 
 int getch(void)              /* get a (possibly pushed back) character */
@@ -37,40 +36,30 @@ void ungetch(int c)          /* push character back on input */
 /* getint: get next integer from input into *pn */
 int getint(int *pn)
 {
-	int c, sign, signChar;
+	int c, sign;
 
-	while (isspace(c = getch()))    /* skip white space */
+	while (isspace(c = getch()))   /* skip white space */
 		;
-	if (!isdigit(c) && c != EOF && c != '+' && c != '-')
-		return 0;            /* it is not a number */
-	sign = (c == '-') ? -1 : 1;
-	if (c == '+' || c == '-') {
-		signChar = c;
-		if (!isdigit(c = getch())) {
-			if (c != EOF)
-				ungetch(c);
-			ungetch(signChar);
-			return signChar;
-		}
+	if (!isdigit(c) && c != '+' && c != '-') {
+		ungetch(c);  /* it is not a number */
+		return 0;
 	}
+	sign = (c == '-') ? -1 : 1;
+	if (c == '+' || c == '-')
+		if (!isdigit((c = getch()))) /* sign followed by a digit? */
+			return 0; /* not a number */
 	for (*pn = 0; isdigit(c); c = getch())
 		*pn = 10 * *pn + (c - '0');
 	*pn *= sign;
-	if (c != EOF)
 	ungetch(c);
 	return c;
 }
 
 int main(void)
 {
-	int array[SIZE], input;
-	size_t n;
+	int input, num;
 
-	for (n = 0; n < SIZE && (input = getint(&array[n])) != EOF; ++n) {
-		if (input == 0 || input == '-' || input == '+')
-			break;
-		printf(" %i", array[n]);
-	}
-	printf("\n");
+	while ((input = getint(&num)) && input != EOF)
+		printf("%i\n", num);
 	return 0;
 }