Write C++ statements that accomplish the following.(6,7)

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