How to store index of a for loop in an array Xcode - iphone

Question

I have a for loop running on string length. the first loop looks for a character common in the second loop. I want to save the index of nameString that is common in an array or a string. Please help. Code is mentioned below.
for (int i=0; i < nameString.length; i++) {
char currentLetter = [nameString characterAtIndex:i];
for (int j=0; j < partnersNameString.length; j++) {
if (currentLetter == [partnersNameString characterAtIndex:j]) {
NSRange range;
range.length=1;
range.location=j;
[partnersNameString replaceCharactersInRange:range withString:#""];
calculateField.text = partnersNameString;
}
}
}

Answer 1

There are several ways to go about doing what you are looking for: you can use a "plain" C array with a count, or you can use an NSMutableArray with wrappers.
The first way would look like this:
NSUInteger indexes[MAX_LENGTH];
NSUInteger lastIndex = 0;
for (int i=0; i < nameString.length; i++) {
char currentLetter = [nameString characterAtIndex:i];
for (int j=0; j < partnersNameString.length; j++) {
if (currentLetter == [partnersNameString characterAtIndex:j]) {
indexes[lastIndex++] = i;
// Go through the rest of your code
...
}
}
}
for (NSUInteger i = 0 ; i != lastIndex ; i++) {
NSLog(#"Found match at index %u", indexes[i]);
}
The second way looks similar, except now you need to use NSNumber to wrap the data going into NSMutableArray:
NSMutableArray *indexes = [NSMutableArray array];
for (int i=0; i < nameString.length; i++) {
char currentLetter = [nameString characterAtIndex:i];
for (int j=0; j < partnersNameString.length; j++) {
if (currentLetter == [partnersNameString characterAtIndex:j]) {
[indexes addObject[NSNumber numberWithInt:i]];
// Go through the rest of your code
...
}
}
}
for (NSNumber in indexes) {
NSLog(#"Found match at index %i", [[indexes objectAtIndex:i] intValue]);
}

Answer 2

You can use NSMutablearray for that
NSMutableArray myArray = [NSMutableArray new];
for (int i=0; i < nameString.length; i++) {
char currentLetter = [nameString characterAtIndex:i];
for (int j=0; j < partnersNameString.length; j++) {
if (currentLetter == [partnersNameString characterAtIndex:j]) {
//And add it here
[myArray addObject:currentLetter];
NSRange range;
range.length=1;
range.location=j;
[partnersNameString replaceCharactersInRange:range withString:#""];
calculateField.text = partnersNameString;
}
}
}

Answer 3

[myArray addObject:[NSNumber numberWithInt:i]];