pointer
Variable is used to store value
Pointer is used to store addresss of valuepointer
Variable is used to store value
Pointer is used to store addresss of valuepointer
/*
**use of pointers is that here even if we change the value of c since the adderss is
* of c is assigned to pc it *pc will also get modified*/
int* pc, c;
c = 5;
pc = &c;
*pc = 1;
printf("%d", *pc); // Ouptut: 1
printf("%d", c); // Output: 1poiner in c
#include <stdio.h>
int main() {
int c = 5;
int *p = &c;
printf("%d", *p); // 5
return 0;
}poiner in c
int* pc, c, d;
c = 5;
d = -15;
pc = &c; printf("%d", *pc); // Output: 5
pc = &d; printf("%d", *pc); // Ouptut: -15c++ pointers
#include <iostream>
using namespace std;
// isualize this on http://pythontutor.com/cpp.html#mode=edit
int main()
{
double* account_pointer = new double;
*account_pointer = 1000;
cout << "Allocated one new variable containing " << *account_pointer
<< endl;
cout << endl;
int n = 10;
double* account_array = new double[n];
for (int i = 0; i < n; i++)
{
account_array[i] = 1000 * i;
}
cout << "Allocated an array of size " << n << endl;
for (int i = 0; i < n; i++)
{
cout << i << ": " << account_array[i] << endl;
}
cout << endl;
// Doubling the array capacity
double* bigger_array = new double[2 * n];
for (int i = 0; i < n; i++)
{
bigger_array[i] = account_array[i];
}
delete[] account_array; // Deleting smaller array
account_array = bigger_array;
n = 2 * n;
cout << "Now there is room for an additional element:" << endl;
account_array[10] = 10000;
cout << 10 << ": " << account_array[10] << endl;
delete account_pointer;
delete[] account_array; // Deleting larger array
return 0;
}poiner in c
int c, *pc;
// pc is address but c is not
pc = c; // Error
// &c is address but *pc is not
*pc = &c; // Error
// both &c and pc are addresses
pc = &c;
// both c and *pc values
*pc = c;Copyright © 2021 Codeinu
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