Checking whether space should be printed in the middle or at the end in for loop?-CodePudding

I am trying to give info to my program whether it should print space or not. I am dealing with prime factorization.

0
1
2               2 
3               3 
4               2 2// I dont wanna print space at the end
5               5 
6               2 3 //but between two nums or more I want space to be added
7               7 
8               2 2 2 
9               3 3 
10              2 5 
11              11 
12              2 2 3 
13              13

My code looks something like this, and its printing spaces at the end (which is not what I want)

void function(int given_limit)
{
    int current_num = 2;
    while (given_limit > 1)
    {
        if (given_limit % current_num == 0)
        {
            if (current_num == 2)
            {
                printf("%d ", current_num);
            }
            else if (current_num == 3)
            {
                printf("%d ", current_num);
            }
            else if (current_num == 5)
            {
                printf("%d ", current_num);
            }
            else if (current_num == 7)
            {
                printf("%d ", current_num);
            }
            else
            {
                printf("%d ", current_num);
            }

            given_limit /= current_num;
        }
        else
            current_num  ;
    }
    printf("\n");
}

In main() I am calling it something like this:

int main()
{
    int given_limit = 13;
    for (int i = 0; i <= given_limit; i  )
    {
        printf("%d\t\t", i);
        function(i);
    }
}

I would appreciate any tips and help. One of the ideas is maybe to store it in an array.

CodePudding user response：

I replaced spaces with asterisks for better visibility and removed the redundant if-elements. Then I introduced a flag which indicates whether it is the output of the first factor or a later one. In front of each later one we put the space (or asterisk).

#include <stdio.h>
#include <stdbool.h>
void function(int given_limit)
{
    bool is_first_factor = true;

    int current_num = 2;
    while (given_limit > 1)
    {
        if (given_limit % current_num == 0)
        {
            if (is_first_factor) {
                is_first_factor = false; // not first anymore
                // print nothing
            } else {
                printf("*"); // between two factors
            }            
            printf("%d", current_num);

            given_limit /= current_num;
        }
        else
            current_num  ;
    }
    printf("\n");
}

int main(int argc, char **argv)
{
    int given_limit = 13;
    for (int i = 0; i <= given_limit; i  )
    {
        printf("%d\t\t", i);
        function(i);
    }
}

$ gcc spacing.c
$ ./a.out      
0
1
2               2
3               3
4               2*2
5               5
6               2*3
7               7
8               2*2*2
9               3*3
10              2*5
11              11
12              2*2*3
13              13
$