3. For each of the following lines of variable declarations, identify it as vali

Question

3. For each of the following lines of variable declarations, identify it as valid or describe what makes the line invalid.

Line 1: n = 12;
Line 2: char letter = ;
Line 3: int two;
Line 4: double x, y, z;

4. Write C++ statements that accomplish each of the following:

a. Declare and initialize int variables x to 25 and y to 18.
b. Declare and initialize an int variable temp to 10 and a char variable ch to 'A'.
c. Add 5 to the int variable x which already exists.
d. Declare and initialize a double variable payRate to 12.50.
e. Copy the value from an existing int variable firstNum into an existing int variable tempNum.
f. Swap the contents of existing int variables x and y. (Declare any new variables you need.)
g. Output the contents of existing double variables x and y, and also output the value of the expression x + 12 / y - 8.
h. Copy the value of an existing double variable z into an existing int variable x.

5. Given the following variable declarations:

int x = 2, y = 5, z = 6;

What is the output from each of the following statements?

a. cout << "x = " << x << ", y = " << y << ", z = " << z << endl;
b. cout << "x + y = " << x + y << endl;
c. cout << "Sum of " << x << " and " << z << " is " << x + z << endl;
d. cout << "z / x = " << z / x << endl;
e. cout << "2 times " << x << " = " << 2 * x << endl;

6. Given the following variable declarations:

int a = 5, b = 6, c;

What is the value of a, b, and c after each of the following statements executes? Assume that the statements execute in the sequence given.

a. a = b++ + 3;
b. c = 2 * a + ++b;
c. b = 2 * ++c - a++;

Explanation / Answer

DEAR FRIEND here is the answer for your questions PLEASE RATE --------------------------------------------------------------- (3) Line 1: n = 12; // u didn`t spicfy the type of the variabls so invalid Line 2: char letter = ; invalid there is no value given after = Line 3: int two;//valid Line 4: double x, y, z;//valid --------------------------------------------------------------- (4) a) int x=25, y= 18; b) int temp=10; char ch='A'; c) x=x+5; d) double payRate=12.5; e) tempNum = firstNum ; f) int z; z=y; y=x; x=z; g) cout

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