CODEWITHSUNDEEP
iphoneobjective-c
Maurizio
Maurizio

Reputation: 89

NSDictionary and loop

NSString * str = @"ABCDEFGHILMN";

NSDictionary *dictOdd = [[NSDictionary alloc] initWithObjectsAndKeys:
                          [NSNumber numberWithInt:0], @"A",
                          [NSNumber numberWithInt:1], @"B",
                          [NSNumber numberWithInt:2], @"C",
                          [NSNumber numberWithInt:3], @"D",
                           ...............................
                          nil];

NSDictionary *dictEven = [[NSDictionary alloc] initWithObjectsAndKeys:
                          [NSNumber numberWithInt:1], @"A",
                          [NSNumber numberWithInt:0], @"B",
                          [NSNumber numberWithInt:5], @"C",
                          [NSNumber numberWithInt:7], @"D",
                           ...............................
                          nil];

int sum  = 0;   
for (int i=1; i < [str length]; i++){
    if(i % 2){
        sum += [dictPair objectForKey:str[i]];
    }else{
        sum += [dictEven objectForKey:str[i]];
    }
}

I have created 2 dictionary for storage int numbers / letters, each letter have a int value.

I would make the sum of int numbers in relation to my str value, but i don't know how assign objectForKey:str[i]];

Upvotes: 0

Views: 301

Answers (2)

utahwithak
utahwithak

Reputation: 6325

I think you are looking for characterAtIndex: which would leave you with

sum+=[[dictPair objectForKey:[NSString stringWithFormat:@"%C",[str characterAtIndex:i]]] intValue];

Upvotes: 1

Sylter
Sylter

Reputation: 1623

You should do something like this, according to NSString Class Reference

Remember that NSNumber and int are different and you should convert before adding them.

NSString *str = ...

NSDictionary *dictOdd = ...
NSDictionary *dictOdd = ...

int sum = 0;
for (int i = 0; i < [str length];  i++) {

   if(i % 2 == 0)
        sum += [[dictPair objectForKey:[str characterAtIndex:i]] intValue];
   else
        sum += [[dictEven objectForKey:[str characterAtIndex:i]] intValue];
}

Upvotes: 0

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