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C ve Sistem Programcıları Derneği - C Ders Notları - Necati Ergin } yuzyaz(milyon); if (milyon) printf("milyon"); } if (val > 1000) { bin = val % 1000000 / 1000; if (bin >= 1) yuzyaz(bin); if (bin > 1) printf("bin"); } yuz = val % 1000; yuzyaz(yuz); int main() { unsigned int val; printf("bir tamsayi giriniz:"); scanf("%u", &val); syaz(val); printf("\n"); } return 0; 306
C ve Sistem Programcıları Derneği - C Ders Notları - Necati Ergin GÖSTERİCİYİ GÖSTEREN GÖSTERİCİLER Gösterici değişkenler içlerinde adres bilgisi tutan nesnelerdir. int *p; gibi bir tanımlamayla ismi p olan, bellekte 2 ya da 4 byte yer kaplayacak olan bir nesne yaratılmış olur. Bu nesne int * türündendir. p bir nesne olduğuna göre, p değişkeninin de adresinden söz edilebilir. p değişkeni adres işlecinin terimi olabilir: &p ifadesinin türü nedir? Bu ifade int * türünden bir nesnenin adresi olabilecek bir türdendir. Bu tür C dilinde (int **) türü olarak gösterilir. O zaman p gibi bir değişkenin adresi bir başka nesnede tutulmak istenirse, p'nin adresini tutacak nesne int ** türünden olmalıdır. Aşağıdaki kod parçasını inceleyin: void func() { int x = 10; int *p = &x; int **ptr = &p; /******/ } Yukarıdaki programda int ** türünden olan ptr isimli değişkene, int * türünden olan p değişkeninin adresi atanıyor. Bunun anlamı şudur: ptr değişkeninin değeri, p değişkeninin adresidir. Başka bir deyişle, ptr göstericisi p göstericisini gösterir. Bu durumda *ptr ifadesi ptr nesnesinin gösterdiği nesnedir. Yani *ptr ifadesi p nesnesinin kendisidir. *ptr ifadesine yapılan atama aslında p nesnesini değiştirir. Aşağıdaki programı inceleyin: #include int main() { int x = 10; int y = 20; int *p; int **pp; printf("x = %d\n", x); printf("y = %d\n", y); p = &x; *p = 100; pp = &p; *pp = &y; *p = 200; printf("x = %d\n", x); printf("y = %d\n", y); 307
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