Lab Manual # 10
Pointers
Example 1:
#include<iostream>
Using namespace std;
Int main ()
Int var1 = 10;
Int var2 = 20;
Int var3 = 30;
Cout<<&var1<<endl<<&var2<<endl;
Int *ptr;
Ptr = &var1;
Cout<<ptr<<endl;
Ptr = &var2;
Cout<<ptr<<endl;
}
Output:
Example 2:
#include<iostream>
Using namespace std;
Int main ()
{
Int array[5] = {31,54,77,52,93};
Int* ptr;
Ptr = array;
For(int j =0; j<5; j++)
{
Cout<<*(ptr++)<<endl;
}
}
Output:
Program No 1: Print the values from array
#include <iostream>
Using namespace std;
Int main(){
Int y [10]= {6,2,3,12};
Int *ptr1=y;
For(int i=0; i<4; i++){
Cout<<*ptr1<<” “;
Ptr1++;
}
}
Output:
Program No 2: Print the values and Addresses from array
#include <iostream>
Using namespace std;
Int main(){
Int y [10]= {6,2,3,12};
Int *ptr1=y;
For(int i=0; i<4; i++){
Cout<<*ptr1<<” “<<endl;
Cout<<ptr1<<” “<<endl;
Ptr1++;
}
}
Output:
Example of Pointer arithmetic
#include <iostream>
Using namespace std;
Int main(){
Long* pnumber = NULL;
Long number1 = 10;
Long number2 = 20;
Pnumber = &number1;
*pnumber += 2;
Cout<<”\nnumber1 = “<<number1
<<” &number = “<<pnumber;
Pnumber = &number2; number1 =
*pnumber *4;
Cout<<”\nnumber1 = “<<number1
<<” pnumber = “<<pnumber
<<”pnumber = “<<*pnumber;
}
Output:
Program No 3: Write a program that display only 6th element of an array
given below using pointers
#include <iostream>
Using namespace std;
Int main(){
Int x [10] ={11,22,33,
44,55,66,77,88,99,110};
Int *ptr_1=&x[5];
Cout<<*ptr_1;
}
Output:
Program No 4: Write a program that take two numbers an input from user.
Find the maximum from both of them using the dereference pointer
comparison
#include <iostream>
Using namespace std;
Int main(){
Cout<<”Enter Two integer type numbers and see which one is
Maximum:\n”;
Cout<<”\nEnter First number\n”;
Int num_1;
Cin>>num_1;
Cout<<”\nEnetr Second number\n”;
Int num_2;
Cin>>num_2;
Int *ptr_1= &num_1;
Int *ptr_2= &num_2;
If( *ptr_1 > *ptr_2){
Cout<<”The Max Number is = “<<*ptr_1<<endl;
}
Else{
Cout<<”The Max Number is = “<<*ptr_2<<endl;
} }
Output:
Program No 5: Swap the values using pointers
#include <iostream>
Using namespace std;
Int main(){
Cout<<”Enter Two Numbers for swaping:\n”;
Cout<<”\nEnter First Number:\n”;
Int num1;
Cin>>num1;
Cout<<”Enter Second Number:\n”;
Int num2;
Cin>>num2;
Int num3;
Int *ptr1= &num1;
Int *ptr2= &num2;
Int *ptr3= &num3;
*ptr3=*ptr1;
*ptr1= *ptr2;
*ptr2= *ptr3;
Cout<<”The Numbers after Swaping are:\n”;
Cout<<” First Number = “<<*ptr1<<endl;
Cout<<” Second Number = “<<*ptr2<<end; }
Output:
Program No 6: Returning more than one values from a function
#include <iostream>
Using namespace std;
Void areaperi(float radius, float &area, float &perimeter);
Int main() {
Float radius, area, perimeter;
Cout << “Enter the radius of the circle:\n”;
Cin >> radius;
Areaperi(radius, area, perimeter);
Cout << “\nArea of a circle = “ << area << endl;
Cout << “\nPerimeter of a circle = “ << perimeter << endl;
}
Void areaperi(float radius, float &area, float &perimeter) {
Area = 3.14159 * radius * radius;
Perimeter = 2 * 3.14159 * radius;
}
Output::
