Chapter 7, Problem 7.7E

Answer each of the following:

1. The _____ operator returns the location in memory where its operand is stored.
2. The _____ operator returns the value of the object to which its operand points.
3. To accomplish pass-by-reference when passing a nonarray variable to a function, it’s necessary to pass the _____ of the variable to the function.

Program Plan Intro

To find the name of the operator that returns the memory location of an operand.

Program Description Answer

& operator.

Explanation of Solution

In C programming, language and symbol are used to get the address of an operand. The symbol (&) is also known as the ‘Address of’ operator.

Sample Program:

//include essential header files
#include <stdio.h>
//main function
intmain()
{
//declare an operand
int sample;

//Print the address of operand named sample 
printf("%p",&sample);

return0;
}

Sample output:

  

Program Plan Intro

To find the name of the operator that returns the value of an object who points to other operands.

Program Description Answer

* operator.

Explanation of Solution

In C programming language, * symbol is used to get the value of other operands that address it points.

Sample Program:

//include essential header files
#include <stdio.h>
//main function
intmain()
{
//declare a operand
int sample =10;
//declare a pointer type operand
int*point;

    point =&sample;

//Print the value
printf("%d",*point);

return0;
}

Sample output:

  

Program Plan Intro

To find the component of a variable that should be passed to a function to accomplish pass by reference.

Program Description Answer

address.

Explanation of Solution

In pass by reference, any changes that a function performs on the passed variable always gets reflected in the actual variable. For this to accomplish, the address of the variable must be passed to function.

Sample Program:

//include essential header files
#include <stdio.h>

//function defination
void passRef(int*a,int*b)
{
//declare a temp variable
int temp;
//assign variable a value to temp variable
    temp =*a;
//assign variable b value to variable a
*a =*b;
//assign variable temp value to variable b
*b = temp;

//return the value
return;
}

//main function
intmain()
{
//declare variable
int sample1 =10;
int sample2 =15;

//calling function using address of sample1 and sample2
    passRef(&sample1,&sample2);

//Print the values after swapping 
printf("sample1 = %d sample2 = %d", sample1, sample2);

return0;
}

Sample output: