Thread: Trying to write a program in C

sounds like homework, i'll give ya a hint . All even numbers are divisible by 2.

here's the logic.......
if a number divided by 2 gives remainder 0..it is even else it is odd.....you can make use of % operator to find remainder......try it and if you are stuck then post the code....someone will help

here's some psuedocode

prompt user for number
input number
if the number has a remainder of 0 when divided by 2
the number is even
otherwise the number is odd

Just type up the right!

Originally Posted by Deadlocked

Code:

#include <stdio.h>
#include <math.h>

int main() 
{
       int a, b;

  printf("print a number:\n");

  scanf("%d",&a);             /* Enter number here */

  b=a%2;

  if(b!=0)                                   /*if number divided by 2 and there is a remainder then number is odd*/

  printf("this number is odd:\n");

  else

  printf("this number is even:\n");       /* prints wheather number is odd or even*/


     return 0;
}

Hot or Not?

Well I won't comment on hot or not, but I would say that you don't really need to #include math.h for this version of your program to work. Also, you don't need the extra variable b. You can evalute a % 2 as an argument to printf().

Code:

#include <stdio.h>

int main(void)
{

        int input;

        printf("\n\nEnter a number: ");
        fflush(stdout);

        if ((scanf("%d", &input)) != 1) {
                puts("\nError: call to scanf() failed\n");
                return 1;
        }

        printf("The number %d is %seven.\n", input,
               ((input % 2) == 0) ? "" : "not ");
             
        return 0;
}

When you get into some more complicated programs, you are likely going to find that you will want a more robust means of getting input from the user than a call to scanf(). If the user does not enter an int (as scanf() is expecting in this case) then the call to scanf() fails. At the very least, if you must use scanf() check the return value as I demonstrated. Later, you can do something like read the user input into a buffer with fgets() and then grab your number with sscanf() or the like.

Anyway it looks not too bad overall.

~/

http://faq.cprogramming.com/cgi-bin/...&id=1043284385