Thread: Help please please please!!!

I am new to C programming and trying to build a c program that can calculate perfect number from 1 to 10000, perfect number is like....1+2+3=6, 1+2+4+7+14=28....

help please please please!!!

here are my codes

Code:

#include <stdio.h>
#include <math.h>
#define max_n 7.0

int 
main(void) 
{
    double n;
	int number;
	for (n=0;n<max_n;n+=1)
	{
	
	number = pow(2.0,n-1.0)* (pow(2.0,n)-1.0);
	
	if (number>1 && number <10000)
	{
	
		printf("The perfect number is &#37;d.\n", number);
	}
	else
	{
		printf("System Error");
	}
    return (0);
	}
}

I'm still not sure I get the concept of a "perfect" number. What exactly are you trying to do here?

Edit: Oh! I think I see now . . .

Code:

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

#define MAX_N 7.0

int main(void) 
{
        double n;
	int number;
	
	for (n=0; n<MAX_N; n += 1)
	{
		number = pow(2.0,n-1.0)* (pow(2.0,n)-1.0);
	
		if ((number > 1) && (number < 10000))
		{
			printf("The perfect number is &#37;d.\n", number);
		}
		else
		{
			printf("System Error");
		}
	}
	
	return 0;
}

Start by indenting your code properly. And move the return 0 out of the for loop.

Here is my output I am getting:

Code:

System ErrorSystem ErrorThe perfect number is 6.
The perfect number is 28.
The perfect number is 120.
The perfect number is 496.
The perfect number is 2016.

Ok, so a few things that are wrong with your code:
1. You return inside the for-loop.
2. You do NOT return at the end of main [which of course matters little if you return "early" every time].
3. It is not actually giving perfect numbers [after fixing the above] since it doesn't make sure that n is a prime number (in fact, it needs to be a Mersenne prime) . See: http://en.wikipedia.org/wiki/Perfect_number

--
Mats