✅ Advent of Code Day 1 - Issue with Chars

For this problem, you essentially have to find the first and last digit contained in each line, so for a line

271lonepxp2flbmbz

271lonepxp2flbmbz

the first digit would be

and the last digit

as well. Put 'em together, you get

. Now you have to find that value for each of the 1000 lines provided and add them all together.

string input = """
9sixsevenz3
seven1cvdvnhpgthfhfljmnq
6tvxlgrsevenjvbxbfqrsk4seven
9zml
""";

int sum = 0;
foreach(string word in input.Split())
{
    List<int> nums = [];
    foreach(char ch in word)
    {
        if(Char.IsDigit(ch))
        {
            nums.Add(Convert.ToInt32(ch - '0'));
        }
    }

    int firstNumber = nums[0];
    int lastNumber = nums[^1];
    int fullNumber = firstNumber * 10 + lastNumber;
    sum += fullNumber;
}

Console.WriteLine(sum);

string input = """
9sixsevenz3
seven1cvdvnhpgthfhfljmnq
6tvxlgrsevenjvbxbfqrsk4seven
9zml
""";

int sum = 0;
foreach(string word in input.Split())
{
    List<int> nums = [];
    foreach(char ch in word)
    {
        if(Char.IsDigit(ch))
        {
            nums.Add(Convert.ToInt32(ch - '0'));
        }
    }

    int firstNumber = nums[0];
    int lastNumber = nums[^1];
    int fullNumber = firstNumber * 10 + lastNumber;
    sum += fullNumber;
}

Console.WriteLine(sum);

This is my code. However, I just keep getting an

Index Out of Range

Index Out of Range

error on the line that says

int firstNumber = nums[0];

int firstNumber = nums[0];

and I just don't get why. I originally had the code a lot more condensed but I expanded it to debug and that appears to be where the issue is. Naturally I initially thought that nothing was being added to the array, but so far I can't figure out why that would be. I'm going to go and

Console.WriteLine

Console.WriteLine

nums

nums

right now to see if it actually contains anything, but either way I'd appreciate it if someone could help me see what I did wrong here.

✅ Advent of Code Day 1 - Issue with Chars

For this problem, you essentially have to find the first and last digit contained in each line, so for a line

271lonepxp2flbmbz

271lonepxp2flbmbz

the first digit would be

and the last digit

as well. Put 'em together, you get

. Now you have to find that value for each of the 1000 lines provided and add them all together.

string input = """
9sixsevenz3
seven1cvdvnhpgthfhfljmnq
6tvxlgrsevenjvbxbfqrsk4seven
9zml
""";

int sum = 0;
foreach(string word in input.Split())
{
    List<int> nums = [];
    foreach(char ch in word)
    {
        if(Char.IsDigit(ch))
        {
            nums.Add(Convert.ToInt32(ch - '0'));
        }
    }

    int firstNumber = nums[0];
    int lastNumber = nums[^1];
    int fullNumber = firstNumber * 10 + lastNumber;
    sum += fullNumber;
}

Console.WriteLine(sum);

string input = """
9sixsevenz3
seven1cvdvnhpgthfhfljmnq
6tvxlgrsevenjvbxbfqrsk4seven
9zml
""";

int sum = 0;
foreach(string word in input.Split())
{
    List<int> nums = [];
    foreach(char ch in word)
    {
        if(Char.IsDigit(ch))
        {
            nums.Add(Convert.ToInt32(ch - '0'));
        }
    }

    int firstNumber = nums[0];
    int lastNumber = nums[^1];
    int fullNumber = firstNumber * 10 + lastNumber;
    sum += fullNumber;
}

Console.WriteLine(sum);

This is my code. However, I just keep getting an

Index Out of Range

Index Out of Range

error on the line that says

int firstNumber = nums[0];

int firstNumber = nums[0];

Console.WriteLine

Console.WriteLine

nums

nums

right now to see if it actually contains anything, but either way I'd appreciate it if someone could help me see what I did wrong here.

✅ Advent of Code Day 1 - Issue with Chars

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✅ Advent of Code Day 1 - Issue with Chars

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