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Pemrograman komputer 8 (prosedur)

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Pemrograman komputer 8 (prosedur)

  1. 1. Pemrograman Komputer Pertemuan 08 Function Bambang Heru Iswanto, Dr.rer.nat M.Si <ul><li>Jurusan Fisika </li></ul><ul><li>Fakultas Matematika dan Ilmu Pengetahuan Alam </li></ul>01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
  2. 2. Learning Outcomes <ul><li>Pada akhir pertemuan ini, diharapkan mahasiswa </li></ul><ul><li>akan mampu : </li></ul><ul><li>Menerapkan penggunaan fungsi </li></ul>01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
  3. 3. Outline Materi <ul><li>What is Function </li></ul><ul><li>Features in a Function </li></ul><ul><li>Uses of a Function </li></ul><ul><li>Function Called in an IF Statement </li></ul><ul><li>Function Called on an Output Line </li></ul><ul><li>Function Used for Conversion </li></ul>01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
  4. 4. What is Function <ul><li>Often, a procedure is needed to do some specific task and return one single value. Examples: </li></ul><ul><ul><li>Validate an input value </li></ul></ul><ul><ul><li>Convert some value, like: </li></ul></ul><ul><ul><ul><li>a sum of money from sterling to euros </li></ul></ul></ul><ul><ul><ul><li>or a temperature from degrees Fahrenheit to degrees Celsius </li></ul></ul></ul><ul><li>In such cases, a special type of procedure, called a function, can be used. </li></ul>01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
  5. 5. Features of a Function <ul><li>Is similar to a procedure in that it: </li></ul><ul><ul><li>has a specific identifying name </li></ul></ul><ul><ul><li>carries out a specific task </li></ul></ul><ul><ul><li>may or may not take parameters </li></ul></ul><ul><ul><li>is called or invoked by another procedure or program </li></ul></ul><ul><li>Is different in that: </li></ul><ul><ul><li>it has a data type associated with it </li></ul></ul><ul><ul><li>it returns a single value to the calling program </li></ul></ul><ul><ul><li>the function name itself contains the value being returned </li></ul></ul>01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
  6. 6. Uses of Function <ul><li>Unlike procedures, functions can be used within other command, e.g. </li></ul><ul><ul><li>As part of a condition in an IF statement </li></ul></ul><ul><ul><ul><li>If IsValid(rateFig) Then . . . </li></ul></ul></ul><ul><ul><li>As part of the output from a Me.Print statement </li></ul></ul><ul><ul><ul><li>Me.Print “Rata - Rata ” & HitungAvg(sum, number) </li></ul></ul></ul><ul><ul><li>As part of an assignment statement </li></ul></ul><ul><ul><ul><li>rupiah = HitungRupiah(uang) </li></ul></ul></ul>01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
  7. 7. Function Called in an IF Statement <ul><li>Private Function IsValid (reply as string) as boolean </li></ul><ul><li>IsValid = False </li></ul><ul><li>If reply = “Yes” Or reply = “No” Then </li></ul><ul><li>IsValid = True </li></ul><ul><li>End If </li></ul><ul><li>End Function </li></ul><ul><li>Calling the function: </li></ul><ul><li>If IsValid(rateFig) Then </li></ul><ul><li>Me.Print . . . . . </li></ul><ul><li>Else . . . . </li></ul>01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
  8. 8. Function Called on an Output Line <ul><li>Private Function HitungAvg (s as Integer, n as Integer) as single </li></ul><ul><li>CalcAvg = s/n </li></ul><ul><li>End Function </li></ul><ul><li>Calling the function: </li></ul><ul><li>Me.Print “Rata – Ratanya : ” & HitungAvg(sum, number) </li></ul>01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
  9. 9. Function Used for Conversion <ul><li>Private Function HitungRupiah (UangDollar as Currency) as Currency </li></ul><ul><li>HitungRupiah = UangDollar * 9700 </li></ul><ul><li>End Function </li></ul><ul><li>Calling the function: </li></ul><ul><li>Dim UangDollar as Currency, UangRupiah as Currency </li></ul><ul><li>UangDollar = InputBox(“Masukkan jumlah Dollar&quot;) </li></ul><ul><li>UangRupiah = HitungRupiah(UangDollar) </li></ul>01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
  10. 10. TERIMA KASIH 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

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