34 lines
850 B
Rust
34 lines
850 B
Rust
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use std::fs;
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fn extract_number(line: &str) -> u32 {
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let mut has_digit: bool = false;
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let mut first: u32 = 0;
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let mut last: u32 = 0;
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for character in line.chars() {
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if character.is_digit(10) {
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if !has_digit {
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has_digit = true;
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first = character.to_digit(10).unwrap();
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}
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last = character.to_digit(10).unwrap();
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}
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}
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let number: u32 = first * 10 + last;
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number
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}
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fn main() {
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let input_filename: &str = "../data/input.txt";
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let contents =
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fs::read_to_string(input_filename).expect("Should have been able to read the file");
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let mut sum: u32 = 0;
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for line in contents.lines() {
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let number = extract_number(line);
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// println!("{:?}", number);
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sum += number;
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}
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println!("{:?}", sum);
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}
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