base_ arithmetic.c

#include <stdio.h>

int main()
{

    // kalan  means : remaining
    // sayılara base dönüşümü yapar
    int onluk,kalan[100],i=0,base;

    printf("enter a base 10 number :  ");
    scanf("%d",&onluk);
    
    printf("\nwhich base to change number :  ");
    scanf("%d",&base);

    for (; onluk/base >0; i++) 
    {
        kalan[i]= onluk%base;
        onluk /= base;
    }
    

    printf("%d",onluk); // when (onluk/base) < 0  ( the last division )
    for (int c = (i-1); c >= 0 ; c--)  // started from i-1 cause lists start from 0
    {
        printf("%d",kalan[c]);  // all remaining numbers 
    }
    
    


    
    

    

}