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#import <objc/objc.h>
#import <objc/Object.h>
 
@implementation TestObj
int main()
{
	NSError *error;
    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"GET"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
 
    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse: nil error:&error];
    if (!data)
    {
        NSLog(@"Download Error: %@", error.localizedDescription);
        UIAlertView *alert =
        [[UIAlertView alloc]initWithTitle:@"Error"
                                  message:[NSString stringWithFormat:@"Error : %@",error.localizedDescription]
                                 delegate:self
                        cancelButtonTitle:@"Ok"
                        otherButtonTitles:nil];
        [alert show];
        return nil;
    }
 
    // Parsing the JSON data received from web service into an NSDictionary object
    NSDictionary *JSON =
    [NSJSONSerialization JSONObjectWithData: data
                                    options: NSJSONReadingMutableContainers
                                      error: &error];
    return JSON;
	// your code goes here
	return 0;
}
@end

prog.m:5:1: warning: cannot find interface declaration for 'TestObj' [enabled by default]
prog.m: In function 'main':
prog.m:7:2: error: unknown type name 'NSError'
prog.m:8:5: error: unknown type name 'NSURL'
prog.m:8:19: error: 'NSURL' undeclared (first use in this function)
prog.m:8:19: note: each undeclared identifier is reported only once for each function it appears in
prog.m:8:39: error: 'urlString' undeclared (first use in this function)
prog.m:9:5: error: unknown type name 'NSMutableURLRequest'
prog.m:9:37: error: 'NSMutableURLRequest' undeclared (first use in this function)
prog.m:10:5: error: cannot find interface declaration for 'NSConstantString'
prog.m:10:5: warning: invalid receiver type 'int *' [enabled by default]
prog.m:10:5: warning: no '-setHTTPMethod:' method found [enabled by default]
prog.m:10:5: warning: (Messages without a matching method signature [enabled by default]
prog.m:10:5: warning: will be assumed to return 'id' and accept [enabled by default]
prog.m:10:5: warning: '...' as arguments.) [enabled by default]
prog.m:11:5: warning: invalid receiver type 'int *' [enabled by default]
prog.m:11:5: warning: no '-setValue:forHTTPHeaderField:' method found [enabled by default]
prog.m:13:5: error: unknown type name 'NSData'
prog.m:13:21: error: 'NSURLConnection' undeclared (first use in this function)
prog.m:16:9: warning: implicit declaration of function 'NSLog' [-Wimplicit-function-declaration]
prog.m:16:43: error: request for member 'localizedDescription' in something not a structure or union
prog.m:17:9: error: unknown type name 'UIAlertView'
prog.m:18:11: error: 'UIAlertView' undeclared (first use in this function)
prog.m:19:44: error: 'NSString' undeclared (first use in this function)
prog.m:19:89: error: request for member 'localizedDescription' in something not a structure or union
prog.m:20:43: error: 'self' undeclared (first use in this function)
prog.m:23:9: warning: invalid receiver type 'int *' [enabled by default]
prog.m:23:9: warning: no '-show' method found [enabled by default]
prog.m:24:9: warning: return makes integer from pointer without a cast [enabled by default]
prog.m:28:5: error: unknown type name 'NSDictionary'
prog.m:29:6: error: 'NSJSONSerialization' undeclared (first use in this function)
prog.m:30:46: error: 'NSJSONReadingMutableContainers' undeclared (first use in this function)
prog.m:32:5: warning: return makes integer from pointer without a cast [enabled by default]

Standard output is empty