gistfile1.c

//
//  main.m
//  EveryOtherLetter
//
//  Created by Charles Kang on 6/20/15.
//  Copyright (c) 2015 Charles Kang. All rights reserved.
//

#import <Foundation/Foundation.h>

void uppercaseEveryOtherLetter(char arr[], int size) {
    for (int i = 0; i < size; i+=2) {
        printf("%d", i);
        arr[i] = toupper(arr[i]);
        
    }

}

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        char string[] = "hello this is charles";
        int count = sizeof(string);
        
        
        uppercaseEveryOtherLetter(string, count);
        
        for (int i = 0; i < count; i++) {
            printf("%c", string[i]);
        }
        
    }
    return 0;
}