pointer operators in c
& ==> address operator * ==> dereference operator // Example int a = 1; int *ptr; // int * defines a pointer variable pointing at an int ptr = &a; // the address of 'a' is assigned to the pointer // 'ptr' is now equal to the address of 'a' // when dereferenced using *, it returns the value at that address printf("value of a: %d", *ptr); // prints "value of a: 1"
poiner in c
int* pc, c, d; c = 5; d = -15; pc = &c; printf("%d", *pc); // Output: 5 pc = &d; printf("%d", *pc); // Ouptut: -15
how to make pointers in c
datatype *var; variable var actually holds the address of the data(memory where it is stored) *var lets you access the data stored at that address
pointer c
#include <stdio.h> #include <stdlib.h> int main() { int *ptr, i , n1, n2; printf("Enter size: "); scanf("%d", &n1); ptr = (int*) malloc(n1 * sizeof(int)); printf("Addresses of previously allocated memory: "); for(i = 0; i < n1; ++i) printf("%u\n",ptr + i); printf("\nEnter the new size: "); scanf("%d", &n2); // rellocating the memory ptr = realloc(ptr, n2 * sizeof(int)); printf("Addresses of newly allocated memory: "); for(i = 0; i < n2; ++i) printf("%u\n", ptr + i); free(ptr); return 0; }
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