Objective-C. Convert C-style string to NSString and vice versa

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) 
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    // Standard C-style string
    const char *foo = "Hello, World!";
    
    // Create NSString from a C string
    NSString *bar = [NSString stringWithUTF8String:foo];
 
    // Create a C string from an NSString
    foo = [bar UTF8String];
    
    [pool drain];
    return 0;
}