Homework 5: while

1. Given an  int variable  k that has already been declared, use a  while loop to print a single line consisting of 97 asterisks. Use no variables other than  k .

k = 0 ; while ( k < 97 ) { cout << "*" ; k ++ ; }

2. Given an  int variable  n that has already been declared and initialized to a positive value, and another  int variable  j that has already been declared, use a  while loop to print a single line consisting of  n asterisks. Thus if  n contains 5, five asterisks will be printed. Use no variables other than  n and  j . Instructor's notes: Try solving this both with and without using the variable j.

j = 0 ; while ( j < n ) { cout << "*" ; j ++ ; }

3. Given  int variables  k and  total that have already been declared, use a  while loop to compute the sum of the squares of the first 50 counting numbers, and store this value in  total . Thus your code should put 1*1 + 2*2 + 3*3 +... + 49*49 + 50*50 into  total . Use no variables other than  k and  total . 

total = 0 ; k = 1 ; while ( k <= 50 ) { total += k * k ; k ++ ; }

4. Given an  int variable  n that has been initialized to a positive value and, in addition,  int variables  k and  total that have already been declared, use a  while loop to compute the sum of the cubes of the first  n counting numbers, and store this value in  total . Thus if  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 . Do NOT modify  n . 

total = 0 ; k = 1 ; while ( k <= n ) { total += k * k * k ; k ++ ; }