Created
December 1, 2023 15:12
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PROGRAM Calibration | |
IMPLICIT NONE | |
INTEGER :: total_sum, first_digit, last_digit, calibration_value | |
CHARACTER(100), DIMENSION(:), ALLOCATABLE :: calibration_document | |
INTEGER :: i, len_line, char_value, status | |
! Initialize total sum | |
total_sum = 0 | |
! Read calibration document from input.txt | |
OPEN(UNIT=10, FILE='input.txt', STATUS='OLD', ACTION='READ', IOSTAT=status) | |
ALLOCATE(calibration_document(1000)) | |
i = 1 | |
DO WHILE (i <= 1000 .AND. status == 0) | |
READ(10, '(A100)', IOSTAT=status) calibration_document(i) | |
i = i + 1 | |
ENDDO | |
CLOSE(UNIT=10) | |
! Calculate the sum of calibration values | |
DO i = 1, SIZE(calibration_document) | |
len_line = LEN_TRIM(calibration_document(i)) | |
IF (len_line > 0) THEN | |
! Filter out non-digit characters and take the first and last digits | |
last_digit = -1 | |
DO WHILE (len_line > 0 .AND. last_digit < 0) | |
char_value = IACHAR(calibration_document(i)(len_line:len_line)) | |
IF (char_value >= IACHAR('0') .AND. char_value <= IACHAR('9')) THEN | |
last_digit = char_value - IACHAR('0') | |
ENDIF | |
len_line = len_line - 1 | |
ENDDO | |
first_digit = -1 | |
len_line = 1 | |
DO WHILE (len_line <= len_trim(calibration_document(i)) .AND. first_digit < 0) | |
char_value = IACHAR(calibration_document(i)(len_line:len_line)) | |
IF (char_value >= IACHAR('0') .AND. char_value <= IACHAR('9')) THEN | |
first_digit = char_value - IACHAR('0') | |
ENDIF | |
len_line = len_line + 1 | |
ENDDO | |
! Combine the digits to form a two-digit number | |
calibration_value = first_digit * 10 + last_digit | |
! Add the calibration value to the total sum | |
total_sum = total_sum + calibration_value | |
ENDIF | |
ENDDO | |
! Print the result | |
PRINT *, 'Sum of calibration values:', total_sum | |
! Deallocate memory | |
DEALLOCATE(calibration_document) | |
END PROGRAM Calibration |
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