longLongValueTest.m

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
    @autoreleasepool {
        NSMutableArray *myNums = [NSMutableArray array];
        NSString *inputs = @"392 392 339 394 393 394 339";
        for (NSString *word in [inputs componentsSeparatedByString:@" "]) {
            NSNumber *n = [NSDecimalNumber decimalNumberWithString:word];
            [myNums addObject:n];
        }
        NSNumber *avg = [myNums valueForKeyPath:@"@avg.self"];
        int64_t result = avg.longLongValue;
        if (result < 100) {
            NSLog(@"result < 100: %lld", result);
        } else {
            NSLog(@"result >= 100: %lld", result);
        }
    }
    return 0;
}