Hackerrank.com Boilerplate template for reading from STDIN and writing to STDOUT for Objective-C

HackerrankObjectiveCBoilerplate.m

#import <Foundation/Foundation.h>

@interface HRSTDIOReadWriter : NSObject
@end

@implementation HRSTDIOReadWriter

+(NSString*) readFromSTDIN
{
    NSFileHandle *kbd = [NSFileHandle fileHandleWithStandardInput];
    NSData *inputData = [kbd readDataToEndOfFile];
    NSString *inputString = [[NSString alloc] initWithData:inputData
                                                  encoding:NSUTF8StringEncoding];
    return inputString;
}

+ (void) writeToSTDOut:(NSString*) outputString
{
    NSFileHandle *stdOut = [NSFileHandle fileHandleWithStandardOutput];
    NSData* outData = [outputString dataUsingEncoding:NSUTF8StringEncoding];
    [stdOut writeData:outData];
}
@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
         [HRSTDIOReadWriter writeToSTDOut:[HRSTDIOReadWriter readFromSTDIN]];
    }
    return 0;
}