Problem with enum

I am trying to run an example from a book I read.

"
#include <stdio.h>

enum months { Jan,Feb,Mar,Apr,Jun,Jul,Aug,Sep,Oct,Nov,Dec};

int main()

{
enum months month;
const char* monthName[]= { "","January","February","March","April","May","June","July","August","September","October","November","December"};

for (month=Jan;month<=Dec;month++)
printf("&#37;2d%11s\n",month,monthName[month]);

return 0;

}
"

This code gives these errors:

main.cpp:35: error: no 'operator++(int)' declared for postfix '++', trying prefix operator instead
main.cpp:35: error: no match for 'operator++' in '++month'

Like you see "month++" in for loop's beginning gives the error but in the book it is written as that...

It isn't giving any error for me.

Code:

---


$ gcc -g 1.c
$ ./a.out
 0         
 1    January
 2  February
 3      March
 4      April
 5        May
 6      June
 7      July
 8    August
 9  September
10    October

---

Although the o/p might not be the same that you want.
For the correct o/p, your code would be

Code:

---


#include <stdio.h>

enum months { Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec};

int main()

{
enum months month;
const char* monthName[]= { "January","February","March","April","May","June","July","August","September","October","November","December"};

for (month=Jan;month<=Dec;month++)
printf("%2d%11s\n",month+1,monthName[month]);

return 0;

}

---

Quote:

---

Originally Posted by AwArEnEsS

This code gives these errors:

---

Please use code tags when posting code.

Quote:

---

Originally Posted by AwArEnEsS

main.cpp:35: error: no 'operator++(int)' declared for postfix '++', trying prefix operator instead
main.cpp:35: error: no match for 'operator++' in '++month'

Like you see "month++" in for loop's beginning gives the error but in the book it is written as that...

---

You cannot increment an enum. Make your loop counter an integer and it will compile.

Code:

---

#include <stdio.h>

enum months { Jan, Feb, Mar, Apr, Jun, Jul, Aug, Sep, Oct, Nov, Dec };

int main()
{
        const char* monthName[]= { "", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };

        for (int month = Jan; month <= Dec; month++)
                printf("%2d%11s\n", month, monthName[month]);

        return 0;
}

---

Also, note how much easier this code is to read when you use the space bar once in a while.

Thanks for your answers.