1. Which of the following are valid C++ assignment statements? Assume that i, x, and percent are double variables.

a. i = i + 5; b. x + 2 = x; c. x = 2.5 *x; d. percent = 10%;

2. Write C++ statement(s) that accomplish the following.

a. Declare int variables x and y. Initialize 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. Update the value of an int variable x by adding 5 to it.

d. Declare and initialize a double variable payRate to 12.50.

e. Copy the value of an int variable firstNum into an int variable tempNum.

f. Swap the contents of the int variables x and y. (Declare additional variables, if necessary.)

g. Suppose x and y are double variables. Output the contents of x, y, and the expression x + 12 / y - 18.

h. Declare a char variable grade and set the value of grade to "A".

i. Declare int variables to store four integers.

j. Copy the value of a double variable z to the nearest integer into an int variable x.