K & R C Programs Exercise 4-11.

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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#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();
c = lastc;
lastc = 0;

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

if(!isdigit(c) && c != '.')
return c;
i = 0;
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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