I just start to learn iOS.
What does "NSMakeRange(i, 1)" mean? 

for (int i = 0; i < [name length]; i++)
{
    NSRange range = NSMakeRange(i, 1);
    NSString *subString = [name substringWithRange:range];
    const char *cString = [subString UTF8String];
    if (strlen(cString) != 3)
    {
        return NO;
    }
}

Where is it used?

ios objective-c cocoa-touch
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