enumeration types

[soonerfan]

I am a struggling toyer with C and I've worked my way up to enumeration types and typedef and now I'm stuck. here is my code:

#include<stdio.h>

enum month{jan=1, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec};
typedef enum month month;


int main()
{
month d,m,x;
system("cls");
printf("Enter number of the month: ");
scanf("%d", &d);
printf("Current\t\tPrevious\n\n");
m=find_prev_month(d);
printf("\t\t%c\n",m);
return 0;
}


month find_prev_month(month d)
{
char x;

month prev_month;
if(d == 1)
x = "January";
switch (d)
{
case jan:
printf("%c\t\tDecember", x);
break;
case feb:
printf("\t\tJanuary");
break;
case mar:
printf("\t\tFebruary");
break;
case apr:
printf("\t\tMarch");
break;
case may:
printf("\t\tApril");
break;
case jun:
printf("\t\tMay");
break;
case jul:
printf("\t\tJune");
break;
case aug:
printf("\t\tJuly");
break;
case sep:
printf("\t\tAugust");
break;
case oct:
printf("\t\tSeptember");
break;
case nov:
printf("\t\tOctober");
break;
case dec:
printf("\t\tNovember");
break;
}
return prev_month;
}

and here is my output:

Enter number of the month: 1
Current Previous

- December


What I would like for it to do is to ask for the number of the month, then take that data, print a table of the current month that was selected and the previous month, then under that, the rest of the months in order, something along these lines if say 7 for July was entered:

Current Previous
July June
August July
September August

and so on for all 12 months. I am by no means a professional programmer, just trying to learn to better myself. HELPPPPP!!!! Thanking you all in advance.....

[soonerfan]

I'm thinking on that code that I could use an array or something like that. I was also possibly thinking that I could use an IF statement, something like:

if(d1==d2)
printf("xxxxx");
else if(d1+1==d2);

Would something like that work?

[Engineer]

I am at work now, so I don't really have time to debug you code, but I would try the following:

Instead of

enum month{jan=1, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec};
typedef enum month month;

try

typedef enum _month_ {
jan=1, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec
}month;

[Salem]

#include<stdio.h>

enum month{jan=1, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec};
typedef   enum month   month;

month find_prev_month ( month d );

char *month_names[] = {
    "December",     // this is month 0 - ie, jan-1
    "January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December",
};

int main() {
    month d,m;
    printf("Enter number of the month: ");
    scanf("%d", &d);
    m=find_prev_month(d);
    printf("Current\t\tPrevious\n");
    printf("%s\t\t%s\n",month_names[d],month_names[m]);
    return 0;
}

month find_prev_month ( month d ) {
    return d-1;
}

[soonerfan]

Salem;

Thanks alot! That was a tremendous help. So the array did work. To get it to print the rest of the months under the top two, I could put in a FOR loop correct? Like:

for(i=0;i>12;++i)


and run them thru this way? Once again, thanks alot!!

[quzah]

> for(i=0;i>12;++i)

Um, no. This will fail on the first check.

i==0 is NOT greater than 12. You mean:

for(i=0;i<12;i++)

Quzah.

[soonerfan]

Yeah, i knew that, it was a stupid typo.....makes me really look like a rookie huh?

anyway, as far as the entire output of every month, would I be able to use it that way? I mean, it prints out the previous month, plus the month that I entered, but not the subsequent months as well.