1 #include <stdio.h>
2 #include <string.h>
3 #include <malloc.h>
4
5 int main(int argc, char* argv[]) 6 { 7 struct data 8 { 9 int i; 10 char c; 11 int j; 12 int arr[2]; 13 }; 14
15
16 struct datawptr 17 { 18 int i; 19 char *c; 20 }; 21
22 struct datawptr dptr1; 23 struct datawptr dptr2; 24 struct data svar1; // a normal variable of type struct data
25 struct data svar2; // a normal variable of type struct data
26
27 svar1.c = 'a'; 28 svar1.i = 1; 29 svar1.j = 2; 30 svar1.arr[0] = 10; 31 svar1.arr[1] = 20; 32
33 svar2 = svar1; 34 printf("Value of second variable \n"); 35 printf("Member c = %c\n", svar2.c); 36 printf("Member i = %d\n", svar2.i); 37 printf("Member j = %d\n", svar2.j); 38 printf("Member arr0th = %d\n", svar2.arr[0]); 39 printf("Member arr1st = %d\n", svar2.arr[1]); 40
41 dptr1.i = 10; 42 dptr1.c = (char*)malloc(sizeof(char)); 43 *(dptr1.c) = 'c'; 44 dptr2.c = (char*)malloc(sizeof(char)); 45 dptr2 = dptr1; 46
47 /* But, with 48 the above approach, one needs to be careful when a data structure contains a member of pointer type because the 49 assignment operator simply copies the value; it will also copy the pointer variable’s value, which is nothing but the 50 address of some variable it is pointing to. */
51
52 printf("int member = %d\n", dptr2.i); 53 printf("char ptr member = %c\n", *(dptr2.c)); 54
55 return 0; 56 } 57
58 /*
59 Value of second variable 60 Member c = a 61 Member i = 1 62 Member j = 2 63 Member arr0th = 10 64 Member arr1st = 20 65 int member = 10 66 char ptr member = c 67 */
