Pointer To Pointer

 QUESTION :

Write a Program to print the value of a variable 'i' by using "Pointer to Pointer" type variable.

#include<stdio.h>

 

int main()

{

    int i = 2;

    int *ptr;

    int **ptr_ptr;

    ptr = &i;

    ptr_ptr = &ptr;

    printf("The value of i is %d", **ptr_ptr);

 

return 0;

}

OUTPUT--->

The value of i is 2

Pointers

 QUESTION :

Write a program using a Function that calculates the Sum And Average of two numbers. 

Use pointers and print the value of Sum and Average in main ().

#include<stdio.h>

void sumAndAvg(int a, int b, int*sum, float*avg){

            *sum = a + b;

            *avg = (float) (*sum/2);

}

 

int main()

{

    int i,j,sum;

    float avg;

    i = 7;

    j = 3;

    sumAndAvg(i,j, &sum, &avg);

    printf("The sum of two numbers is %d\n", sum);

    printf("The average of two numbers is %f\n", avg);

 

return 0;

}

OUTPUT--->

The sum of two numbers is 10 The average of two numbers is 5.000000

Print Address of variable Using Pointers

 Question :

Write a program to print the address of a variable. Use this address to get the value of this variable.

#include<stdio.h>

 

int main()

{

    int a = 111;

    int *ptr;

    ptr = &a ;

   

    printf("The address of variable a is : %u\n", &a);

    printf("The value of variable a is : %d\n", *(&a));

    printf("The value of variable a is : %d\n", *ptr);

 

return 0;

}

OUTPUT--->

The address of variable a is : 6422216 The value of variable a is : 111 The value of variable a is : 111