6.10 from the book

[mtube]

Code: (Objective-C)

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
	int p, isPrime, d;
	
	p = 2;
	
	while (p <= 50){
		isPrime = 1;
		++p;
		for (d = 2; d< p; ++d)
			if ( p% d == 0 )
				isPrime = 0;
		if (isPrime != 0)
			NSLog (@"%i", p);
	}

    // insert code here...
    //NSLog(@"Hello, World!");
    [pool drain];
    return 0;
}

run
[Switching to process 4489]
Running…
2010-05-06 23:43:03.299 6.10[4489:80f] 3
2010-05-06 23:43:03.303 6.10[4489:80f] 5
2010-05-06 23:43:03.304 6.10[4489:80f] 7
2010-05-06 23:43:03.305 6.10[4489:80f] 11
2010-05-06 23:43:03.306 6.10[4489:80f] 13
2010-05-06 23:43:03.307 6.10[4489:80f] 17
2010-05-06 23:43:03.309 6.10[4489:80f] 19
2010-05-06 23:43:03.310 6.10[4489:80f] 23
2010-05-06 23:43:03.311 6.10[4489:80f] 29
2010-05-06 23:43:03.312 6.10[4489:80f] 31
2010-05-06 23:43:03.312 6.10[4489:80f] 37
2010-05-06 23:43:03.315 6.10[4489:80f] 41
2010-05-06 23:43:03.316 6.10[4489:80f] 43
2010-05-06 23:43:03.316 6.10[4489:80f] 47

Debugger stopped.
Program exited with status value:0.

I was playing around with the prgm in the book. why doesn't  the number 2 show what did i do wrong in the while construct?

[skochan]

This is a modified version of 6.10. You need to look at where you're incrementing p.

Cheers,

Steve Kochan