A bin2dec converter

/* Binary to decimal converter
 *
 *        by : koby
 *           koby@in.gr
 * If you like this code, visit my site
 *           http://www.codecraft.tk
 */

#include <stdio.h>
#include <math.h>
int main(void) {
	int dec=0, flag=0.0;
	int bin, bit;
	double exp=0.0;
	printf("Enter a binary number : ");
	scanf("%d", &bin);
	while(bin) {
		bit=bin%10;
		if(bit!=0 && bit!=1) {
			flag=1;
		}
		bin=bin/10;
		dec=dec+bit*pow(2, exp);
		exp++;
	}
	if(flag) {printf("\n+++ Not a binary number !!!\n");}
	else {printf("\n+++ Number in decimal : %d\n", dec);}
	return 0;
}
This function accepts the input date and the weekending day (Sun=1.....Sat=7).
If the weekday of the input date is the same as the weekending day it returns the input date
Function weekendday(inputdate, day)
If Weekday(inputdate) > day Then
inputdate = inputdate + 7
End If
weekendday = inputdate + (day - Weekday(inputdate))
End Function