Perulangan while

Julia Tingkat Menengah

Anthony Markham

Quantitative Developer

Perulangan while - sintaks

Kurang umum dibanding for, tetapi berguna dalam beberapa kasus.
Ulangi expression selama condition bernilai true.
Sering dipakai untuk mengulang aksi hingga kondisi terpenuhi.

while condition
    expression
end

Perulangan while - contoh

Ulangi rangkaian aksi hingga kondisi bernilai true

counter = 10
while counter != 0
    print(counter, " ")
    counter = counter - 1
end

10 9 8 7 6 5 4 3 2 1

Perulangan while - iterasi pertama

# First iteration
counter = 10
while counter != 0  # counter = 10 here, so this is true
    print(counter, " ")  # print counter, equal to 10
    counter = counter - 1  # decrease the value of counter by 1
end

Perulangan while - iterasi kedua

# Second iteration
counter = 10
while counter != 0  # counter now = 9 here, so this is true
    print(counter, " ")  # print counter, equal to 9
    counter = counter - 1  # decrease the value of counter by 1
end

10 9

Perulangan while - iterasi ketiga

# Third iteration
counter = 10
while counter != 0  # counter now = 8 here, so this is true
    print(counter, " ")  # print counter, equal to 8
    counter = counter - 1  # decrease the value of counter by 1
end

10 9 8

Perulangan while - loop tak berujung

Apa yang terjadi jika kita lupa menurunkan nilai variabel counter?

# Second iteration
counter = 10
while counter != 0  # counter now = 9 here, so this is true
    print(counter, " ")  # print counter, equal to 9
end

10 10 10 10 10 10 10 10 10

Perulangan while - penghentian

Di lingkungan DataCamp, loop tak berujung akan memutus sesi
Di mesin lokal Anda, hentikan program Julia dengan Ctrl + C

Ayo berlatih!

Julia Tingkat Menengah