Loop Homework
1. Given the run of the following C++ code fragment if the user inputs 3, 7, 12, and 5
int n, times, total, curr;
cout << “How many times: “;
cin >> times;
total = 0;
for (n = 1; n <= times; n = n + 1)
{
cout << “Enter an int:
“;
cin >> curr;
total = total + curr;
cout << curr
<< “ “ << total << endl;
}
2. What is printed by the following C++ program fragment if the user enters 27?
divisor = 1;
flag = 0;
cout
<< "Please enter a number: ";
cin
>> num; //num is 27
while ( !flag)
{
if ((num %
divisor) == 0) flag = 1;
divisor =
divisor + 1;
if (divisor
== num) flag = 1;
cout
<< "Help me please!" <<endl;
}
if (divisor ==
num) cout << "I hate computers!"
<< endl;
else cout << "I love computers!" << endl;
3. What is printed by each of the following program fragments?
a) for (j = 20; j <= 5; j = j -4)
cout << "Again\n";
b) for (j = 10; j > 4; j--)
cout << j << ' ';
c)
n
= 5;
r
= 1;
do{
cout << r << "**";
r = r + 2;
}while (r <= n);
cout
<< r;
d) for (i = 1; i <= 5; i++)
{
for (j = 0; j < i; j++)\
cout
<< '*';
cout
<< endl;
}
4. Write the code fragment (not a complete program) that prints the first n positive integers, such that each integer is preceded by two asterisks.
For example, if n = 3 then the output would be **1**2**3
if n = 5 then the output would be **1**2**3**4**5
5. What is printed by the following while loops?
a) int m = 5;
while
(m >= 1)
{
cout << "m = "
<< m << endl;
m = m - 2;
}
b) sum = 8;
while (sum < 10)
{
sum--;
cout << "sum = "
<< sum;
}