Given an int variable n that has been initialized to apositive value and, in addition, int variables kand total that have already been declared, use a loop to compute the sum of the cubes of the first n whole numbers, and store this value in total . thusif n equals 4, your code should put 1*1*1 + 2*2*2 + 3*3*3 +4*4*4 into total . use no variables other than n, k , and total .