20.45. Write a program that read any binary number and display equivalent decimal number.

#include<stdio.h>
#include<conio.h> 

#include<string.h>
void main ()
{
char *st;
int i,n,l;
clrscr();

st=(char *)malloc(sizeof(char)*100);
printf ("Enter any binary number: ");

scanf("%s",st);

n=0;
l=strlen(st);
for(i=0; i<1; i++)

n=n*2+st[i]-48;

printf("Eqivalent decimal numberis: %ld",n);

getch ();

}