#include<stdio.h>
#include<math.h>

 int main()
{
long int i,n,x=0,a;
printf("Enter any binary number: ");
scanf("%ld",&n);
printf("\nThe decimal conversion of %ld is ",n);

 for(i=0;n!=0;++i)
{
a=n%10;
x=(a)*(pow(2,i))+x;
n=n/10;
}

 printf("%ld",x);

 return 0;
}

 OUTPUT :

 Enter any binary number : 1010

 The decimal conversion of 1010 is 10
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