K and R C, Solution to Exercise 4-11:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C Program to modify the K & R C Programs Exercise 4-3, Modify the gettop function so that it doesn’t need to use ungetch by using internal static variable. Read more about C Programming Language .

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#include<stdio.h>
#include<ctype.h>
#define NUMBER '0'

int getch(void);

/* getop: get next operator or numeric operand. */
int getop(char s[])
{
 int i ;
 int c;
 static int lastc = 0;

 if(lastc == 0)
  c = getch();
 else{
  c = lastc;
  lastc = 0;
 }

 while((s[0] = c) == ' ' || c == 't')
  c = getch();
 s[1] = '';

 if(!isdigit(c) && c != '.')
  return c;              
 i = 0;
 if(isdigit(c))
  while(isdigit(s[++i] = c = getch()))
   ;
 if(c == '.')

  while(isdigit(s[++i] = c = getch()))
   ;

 s[i] = '';
 if(c != EOF)
  lastc = c;
 return NUMBER;

}

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