49 lines
731 B
Go
49 lines
731 B
Go
package main
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import (
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"bufio"
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"fmt"
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"io"
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"log"
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"os"
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)
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func main() {
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file, err := os.Open("2023/day-1/files/input")
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if err != nil {
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log.Fatalf("Error: %v", err)
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}
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defer file.Close()
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fmt.Printf("Sum total: %d\n", calculateSumCalibrationValues(file))
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}
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func calculateSumCalibrationValues(r io.Reader) int {
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scanner := bufio.NewScanner(r)
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sum := 0
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for scanner.Scan() {
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line := scanner.Text()
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sum = sum + calibrationValue(line)
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}
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return sum
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}
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func calibrationValue(line string) int {
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var digits []int
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for _, r := range []rune(line) {
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if (r >= '0') && (r <= '9') {
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digits = append(digits, int(r - '0'))
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}
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}
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if len(digits) == 0 {
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return 0
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}
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return (10*digits[0]) + digits[len(digits)-1]
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}
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