..AN IMPLEMENTATION TO CONVERT BINARY NUMBER INTO DECIMAL.

.AN IMPLEMENTATION TO CONVERT  BINARY NUMBER INTO DECIMAL..*/

#include<stdio.h>

#include<math.h>

int powi(int,int);//MAKE FUNCTION TO FIND OUT POWER//

int main()

{

        int i=0,num,dec=0,a=0,len,rem;

        printf("ENTER THE NUM WHICH IS TO BE CONERTED INTO DECIMAL:\n");

        scanf("%d",&num);

        while(num!=0)

        {

                rem=num%10;//TAKE REMAINDER OF NUMBER//

                num=num/10;//DIVIDE NUMBER BY 10//

                a=powi(2,i);//get perticular power of 2...//

                printf("pow(2,%d)=%d\n",i,a);

                dec=dec+ (rem * a);//dec is 0 initially ...everytime dec is added to (rem*a)means

1. //NUMBER IS EVERYTIME DIVIDED BY 2//

2. //REM IS MULTIPLIED TO POWER OF 2.....0TH IST TIME DIVIDED//1ST 2ND TIME DIVIDED//2ND 3RD TIME DIVIDED...SO ON...//

                i++;//i is what power of 2 should be taken...//increments everytime for each division of number untill number becomes 0...//

        }

        printf("dec=%d\n",dec);//print thAT dec VALUE....WHICH IS MADE BY ALL THE ADDITION UPTO NUM!=0;;;;

        return 0;

}

int powi(int a,int i)

{

        int cnst=0,s=0;

   cnst=a;//a IS CONSTANT ...POWER OF WHICH NUMBER IS TO BE FIND OUT;;;;

        if(i==0)//AS 0TH POW(2)=1....SO IF i=0;;;;then output==1;;;;

                return 1;

        else

                for(s=1;s<i;s++)//1 to <i value loop will be operated to get modified value as perticular power of 2..//

                        a=cnst*a;//const
remain permanent value 2...but a contains modified value of power of
perticular number in for loop each
time...//2=2*1...4=2*2....8=2*4...16=8*2....32=16*2...//

        return a;//returned that modified value...//..in our case power of 2...is returned..//

}