Hello new to to the forum and also to programmig.

[spraypaul]

Write code to find out if a number is prime.
Until you can do that you do not have a chance at doing this assignment.
After writing a function to determine if a number is prime; than take this code and create a new function (possibly called factor) to do this assignment.

Tim S.

Here is a code to see if a number is prime

#include <stdio.h>

int main() {


    int N, a, b;


    printf("What number do you want to test?\n");
    scanf("%d",&N);


    for(a=2; a<N; a++) {
        if(N % a == 0) {
            printf("%d is divisble by %d.\n", N, a);
            break;
        }
    }


    if(a == N) //the loop ran completely and never 'broke'
        printf("%d is a prime!\n",N);


    return 0;

[stahta01]

Take you have not yet learned to write functions.
Is this correct?

Tim S.

[stahta01]

I did a untested change to your code; you might be able to figure out what else to change.

#include <stdio.h>

int main() {


    int N, a, b=1;


    printf("What number do you want to test?\n");
    scanf("%d",&N);


    for(a=2; a<N; a++) {
        if(N % a == 0) {
            b = N/a;
            printf("%d is divisble by %d.\n", N, a);
            printf("%d is divisble by %d.\n", N, b);
        }
    }


    if(b == 1) 
        printf("%d is a prime!\n",N);


    return 0;
}