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

double maxnumber(int);

int main(int argc, char *argv[]){
	printf("You say: %.lf\nlimits.h says: %d.\n", maxnumber(8*sizeof(int)),
	INT_MAX);
	system("PAUSE");
	return 0;
}

double maxnumber(int bits){
	int counter = 0;
	double number;
	while(counter != bits){
		number += pow(2,counter);
		counter = counter + 1;	
	}
	number = number / 2 - 1;
	return number;
}