1. While and Do While Loops
By Ms. Bellacera

2. While Loop Form
while (condition) { statement; } //executes an //unknown //number of times
int z=0;
while (z<10) {
z=z+1; }
cout<<“z is “<<z<<endl;
What gets printed?

3. Do While Loop Form
int num, sum=0; do {
cout<<“enter the number”<<endl;
cin<<num;
sum=sum+num;
} while (num!=0);
cout<<“sum is “<<sum<<endl;
do { statement; } while (condition); //executes //at least once
What’s this?
What gets printed?

4. While versus For Loops
initialization while (condition) { statement incrementation }
for (initialization; condition; incremenatation) {
statement . }

5. While/For Loops Questions
1. Write the while loop equivalent to the following loop.
double total = 0.0;
double val;
for (val=1.0; val<1000; val*=1.5) {
total +=val; }
2. Write a for loop equivalent to the following while loop.
int k=1;
int sum=0;
while (k<=num)
sum+=k;
k+=2;

6. While versus For Loops initialization
int z=0; while (z<10) { z++; } cout<<“z is“<<z<<endl;
condition
for (int z=0; z<10; z++) { }
cout<<“z is “<<z<<endl;
incrementation

7. Create the Factorial Program
Produce a listing of factorials starting at 0! Continue until the value of the factorial goes over 4,000,000. Show the factorial and its value on each iteration. (ie. 0! = 1 1! = 1 2! = 2 . )