Decimal to Binary in C, result printed all mismatched

Sachin Bhatt

I made a code in c that switches decimal to binary and vice versa, the issue I have is that when I do the convertion from decimal to binary it prints the numbers all mixed up, model, assuming I input the number 123 as a decimal it ought to print 11110110 however my program changes over it as 10111110

{Code}

#include <stdio.h>
#include <stdlib.h>
main()
{
    int i, no, coc, re, opt;
    int dec;
    int bin, p, c;
    printf ("\n1. Decimal to binary \n2. binary to decimal \n choose an option: ");
    scanf("%d", &opt);
    switch(opt)
    {
          
        case 1:
        printf("\nDecimal No.: ");
        scanf("%d",&no);
        if (no>2)
        {
            printf("Your binary No.: ");
            for (i=1;1<=no; i++)
            {
                coc=no/2;
                no=coc;
                re=coc%2;
                printf("%d", re);
            }
        }
        break;
    
    
        case 2: printf("\nBinary No.: ");
        scanf("%d",&bin);
        c=1;
        dec=0;
        while(bin>0)
        {
            p=0;
            p=c*(bin%10);
            dec+=p;
            c*=2;
            bin/=10;
        }
            printf("Your decimal No.: %d",dec);
        break;
    
    
    
        default:
            printf("\a\n\nError");
        break;
    }   
    return 0;
}

Here is the article I was reading before trying this all stuff https://www.scaler.com/topics/decimal-to-binary-in-c/

Thanks in advance!

SGaist

Hi,

Your not doing the operations in the correct order and as the scaler various demonstration does, you are printing your result in the wrong order.