day1.p

/*
After feeling like you've been falling for a few minutes, you look at the device's tiny screen. "Error: Device must be calibrated before first use. Frequency drift detected. Cannot maintain destination lock." Below the message, the device shows a sequence of changes in frequency (your puzzle input). A value like +6 means the current frequency increases by 6; a value like -3 means the current frequency decreases by 3.

For example, if the device displays frequency changes of +1, -2, +3, +1, then starting from a frequency of zero, the following changes would occur:

    Current frequency  0, change of +1; resulting frequency  1.
    Current frequency  1, change of -2; resulting frequency -1.
    Current frequency -1, change of +3; resulting frequency  2.
    Current frequency  2, change of +1; resulting frequency  3.

In this example, the resulting frequency is 3.

Here are other example situations:

    +1, +1, +1 results in  3
    +1, +1, -2 results in  0
    -1, -2, -3 results in -6

Starting with a frequency of zero, what is the resulting frequency after all of the changes in frequency have been applied?
*/
DEFINE VARIABLE iShift AS INTEGER     NO-UNDO.
DEFINE VARIABLE iFreq AS INTEGER     NO-UNDO.

ETIME(YES).

INPUT FROM C:\User\JCCARDOT\Perso\Travail\aoc\aoc2018\day1.txt.
REPEAT:
    IMPORT iShift.
    iFreq = iFreq + iShift.
END.
INPUT CLOSE.

MESSAGE ETIME SKIP
    iFreq
    VIEW-AS ALERT-BOX INFO BUTTONS OK.