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PERTEMUAN IV POINTER

PERTEMUAN IV POINTER. Pointer adalah suatu variabel penunjuk yang menunjuk pada suatu alamat memori komputer

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PERTEMUAN IV POINTER

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  1. PERTEMUAN IV POINTER Pointer adalahsuatuvariabelpenunjuk yang menunjukpadasuatualamatmemorikomputer Pointer merupakanvariabel level rendah yang dapatdigunakanuntukmenunjuknilai integer, character, float, double, atau single, danbahkantipa-tipe data lain yang didukungolehbahasa C.

  2. Variabelbiasa, sifatnyastatisdansudahpasti, sedangkanpada pointer sifatnyadinamisdandapatlebihfleksibel. • Variabel pointer yang tidakmenunjukpadanilaiapapunberartimemilikinilai NULL, dandisebutsebagaidangling pointer karenanilainyatidakdiinisialisasidantidakdapatdiprediksi.

  3. Operator Alamat • Setiapvariabel yang dideklarasikan, disimpandalamsebuahlokasimemoridanpenggunabiasanyatidakmengetahuidialamatmana data tersebutdisimpan.

  4. #include < stdio.h> #include <conio.h> Int main () { Intnilai 1 = 4; Intnilai 2 = 5; Float nilai 3 = 3.5; Char nama [11] = “abcdefghij “; Int *nilai_p1 = &nilai1; Int *nilai_p2 = &nilai2; Char *nilai_p4 = nama; Float *nilai_p3 = &nilai3; Cout<<“nilai 1 = “<<*nilai_p1<<“, alamat1 = “ <<&nilai_p1; Cout<<“\nnilai 2 = “<<*nilai_p2<<“, alamat2 = “ <<&nilai_p2; Cout<<“\nnilai 3 = “<<*nilai_p3<<“, alamat3 = “ <<&nilai_p3; Cout<<“\nnilai 4 = “<<*nilai_p4<<“, alamat4 = “ <<&nilai_p4; Getch () ; }

  5. 2. Operator Reference (*) Penggunaan operator ini, berartimengaksesnilaisebuahalamat yang ditunjukanolehvariabel pointer. Contoh : Bil1=*Bil2; Dibaca: bil1 samadengannilai yang ditunjukanoleh bil2.

  6. Deklarasivariabel pointer Tipe * nama_pointer; Contoh : #include <iostream.h> Main () { Int ni11 = 5, ni12 = 15; Int *ptr; \Ptr = &ni11; *ptr = 10; Ptr=&ni12; *ptr=20 Cout<<“Nilai 1 = “<<ni11<<“dannilai 2 = “<<ni12; Return

  7. Beberapahaltantang pointer : X = 10; Ptr1 = &X; Ptr2 = ptr1; Ptr1 dan ptr2 menghasilkanalamatvariabel X yang sama.

  8. OPERASI POINTER • Operasipenugasan Nilaidarisuatuvariabel pointer dapatdisalinkevariabel pointer yang lain. Contoh: y = 35; X1 = &y; X2 = x1;

  9. Contoh : #include <conio.h> #include <iostream.h> Int main () { Float nilai, *p1, *p2; Nilai = 14.54; Cout<<“nilai = “<<nilai<<“, alamatnya ‘<<&nilai ; P1 = &nilai; P2 = p1; //operasipemberiannilai, berartialamat x2 samadengan x1 Cout<<“\nnilai p1 = “<<*p2<<“, p1 menunjukanalamat “ <<p1; //padaawalnya p2 masih dangling pointer Cout<<“\nmula-mulainilai p2 = ‘<<*p2 <<“, p2 menunjukanalamat” <<p2; Getch () ; }

  10. 2. Operasiaritmatika • Suatuvariabel pointer hanyadapatdilakukanoperasiaritmatikadengannilai integer saja. • Operasi yang biasadilakukanadalahoperasipenambahandanpengurangan. • Operasipenambahandengansuatunilaimenunjukanlokasi data berikutnya (index selanjutnya) dalammemoti. Begitujugaoperasipengurangan.

  11. #include <iostream.h> #include <conio.h> Void main () { Intnilai [3], *penunjuk; Clrscr () ; Nilai [0] = 125; Nilai [1] =345; Nilai [2] =750; Penunjuk = &nilai [0] ; Cout<<“Nilai “<<*penunjuk <<“ adadialamatmemori “ <<penunjuk; Cout<<“\nNilai “<<*(penunjuk+1) <<“adadialamamemori” <<penunjuk+1; Cout<<“\nNilai “<<* (penunjuk+2) <<“ adadialamatmemori “<<penunjuk+2; Getch () ; }

  12. 3. OperasiLogika #include <iostream.h> #include <conoi.h> Void main () { int *pa, *pb, a = 100, b = 10; Clrscr () ; Pa = &a ; Pb = &b; If (*pa< *pb) { cout<<“pa menunjukankememorilebih RENDAH daripb\n”; } Else if (*pa == *pb ) {cout<<“pa menunjukankememori yang SAMA denganpb\n”; } Else if (*pa > *pb ) {cout<<“pa menunjukankememorilebih TINGGI daripb\n”; } Getch () ; }

  13. ARRAY DAN POINTER // more pointers #include <iostream.h> #include <conio.h> Int main () { Char array [5] ; Char * p ; P = array; *p = ‘a’ ; P++; *p = ‘b’ ; P = &array [2]; *p = ‘c’ ; P = array + 3; *p = ‘d’ ; P =array; * (p+4) = ‘e’ ; For (int n=0; n<5; n++) Cout << array [n] << “, “; Getch () ;

  14. #include <iostream> #include <conio. Const int array = 5; Int main () { Int A [array] ; Const int *pInt = A; For (inti=0; i<array;i++) {cout<<“Input array : “;cin>>A[i] ; } Fof (int n=0; n<array; n++) { cout << “ Element [“ << n << “] = “ pInt++; } Getch () ; }

  15. #include <iostream.h> #include <coin.h> Void main () { Inttgl_ lahir [ ] = { 13,9,1982 }; Int *ptg1; Ptg1 = tgl_lahir; /* ptg1 berisialamat array */ Cout<<“Diaksesdengan pointer \n”; Cout<<“Tanggal = “<< *ptg1; Cout<<“\nBulan = “<< *(ptg1 + 1 ); Cout<<“\nTahun = “<< * (ptg1 + 2); Cout<<“\nDiaksesdengan array biasa\n”; Cout<<“Tanggal = “<< tgl_lahir [0] ; Cout<<“\nBulan = “<<tg1_1ahir [1] ; Cout<<“\nTahun = “<< tg1_1ahir [2] ; Getch () ; }

  16. Latihanbuatinputanscrdinamisdari program dibawahini : // more pointers #include <iostream.h> #include <conio.h> Int main () { Char array[5] ; Char * p; P = array; *p = ‘a’; P++; *p = ‘b’ ; P = *array [2]; *p = ‘c’; P = array + 3; *p = ‘d’; P = array; * (p+4) = ‘e’ ; For (int n=0; n<5; n++) Cout << array [n] << “, “; Getch () ;

  17. Jawab : // more pointers #include <iostream.h> #inclide <conio.h> Int main () { Char * p; P = array; For (inti=0;i<=4;i++) { cout<<“\nInput array [‘<<i<<“]=“;cin>>*p; p++; } For (int n=0; n<5; n++) Cout << array [n] << “, “; Getch () ; }

  18. TUGAS SILAHKAN DICOBA PROGRAM YANG ADA HINGGA BISA DIJALANKAN (RUN), KEMUDIAN BUATKAN ALUR LOGIKANYA.Catatan : Tidakada yang copy-paste punyakawan !Dikumpul : 2 Minggudarisekarang.

  19. SampaiJumpa…….

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