Chapter 3, Problem 1RE

What is the value of each variable after the if statement?

1. a. int n = 1; int k = 2; int r = n;

  if (k < n) { r = k; }

1. b. int n = 1; int k = 2; int r;

  if (n < k) { r = k; }

  else { r = k + n; }

1. c. int n = 1; int k = 2;

  int r = k; if (r < k) { n = r; }

  else { k = n; }

1. d. int n = 1; int k = 2; int r = 3;

  if (r < n + k) { r = 2 * n; }

  else { k = 2 * r; }

Explanation of Solution

a.

//Initialize the variables

int n=1; int k=2; int r=n;

//Check the condition

if (k<n)

{

    //Assign k to r

    r=k

}

Value of each variable after “if” statement:

n=1, k=2, r=1

Explanation:

The value assigned to variable “n” is “1”, the condition inside the “if” statement fails. As the value of “n” is not greater than “k” and so the value of “r” remains unchanged.

Explanation of Solution

b.

//Initialize the variables

int n=1; int k=2; int r;

//Check the condition

if (n<k)

{

    //Assign k to r

    r=k

}

//Otherwise

else

{

    //Add k+n and store it in r

    r=k+n;

}

Value of each variable after “if”statement:

n=1, k=2, r=2

Explanation:

The value assigned to variable “n” is “1”, the condition inside the “if” statement is true. As the value of “k” is greater than “n” and so the value of “r” is changed to “2”.

Explanation of Solution

c.

//Initialize the variables

int n=1; int k=2; int r=k;

//Check the condition

if (r<k)

{

    //Assign k to r

    n=r

}

//Otherwise

else

{

    //Assign n to k

    k=n;

}

Value of each variable after “if”statement:

n=1, k=1, r=2

Explanation:

The value assigned to variable “n” is “1”, the condition inside the “if” statement fails. As the value of “r” is not greater than “k” and it moves to the “else” part where the value of “k” is changed to value of “n” that is “1”. In the first statement, the value of “r” is initialized to value of “k” that is “2”.

Explanation of Solution

d.

//Initialize the variables

int n=1; int k=2; int r=3;

//Check the condition

if (r<n+k)

{

    //Assign k to r

    r=2*n

}

//Otherwise

else

{

    //Assign n to k

    k=2*r;

}

Value of each variable after “if”statement:

n=1, k=6, r=3

Explanation:

The value assigned to variable “n” is “1”, the condition inside the “if” statement fails. As the value of “r” is not greater than “n+k” and it moves to the “else” part where the value of “k” is changed to value of “2*r” that is “6”. In the first statement, the value of “r” is initialized to “3”.