1. Repetition Statements
The question being asked is "Should I execute the statement block AGAIN?"
All repetition statements use a boolean expression to make the decision.
3 Repetition statements
while
for
do / while
"while" is the general all-purpose looper.
The other two are special purpose.

2. while( boolean expression )
statement; {
statement1;
statement2;
statement3; }
int counter = 1; .
while( counter < 10 )
cout << "My name is Lee." << endl;
counter++; { }

3. cout << "Enter a value below 100 to start with: ";
double start;
cout << "Enter a value below 100 to start with: ";
cin >> start;
while( start < 100 )
start *= 1.1;
cout << "The final value of start is: " << start << endl;
How many times is the loop going to execute?
Don't know, it depends on the starting value.
BUDDY SAGA. loopcount.cpp
loopcount1.cpp
loopflag.cpp
loopsentinel.cpp
NEXT: LoopBADSentinel.cpp

4. #include <iostream.h> int main() {
double sqMeters = 1, //Input by user
sqYards; //Calculated
while( sqMeters != 0 )
cout << "Enter number of square meters: ";
cin >> sqMeters;
//Apply the conversion factor and report.
sqYards = sqMeters * 1.196;
cout << "Number of square yards: " << sqYards << endl; }
return 0;
Next – "for" loop

5. for( initialization ; boolean expression ; incrementing action )
statement block;
int counter;
for( counter = 0; counter < 10; counter++ )
cout << "This is line number " << counter + 1 << endl;
int reps, total;
for (reps = 0; reps <= 6; reps++) {
total = reps * 8;
cout << total << endl; }
Counter control only

6. while( <boolean expression> );do
statement;
while( <boolean expression> ); do {
statement1;
statement2; .
statementn; }
while( <boolean expression> );
When the code in the statement block MUST execute at least one time.

7. int count = 0; do {
cout << "Count: " << count << " " << count * count << endl;
count++; }
while( count < 20 );
int count = 0; do
cout << "This is line " << ++count << endl;
while( count < 20 );

8. Selecting the Correct Repetition Statement
if( the statement block must execute at least one time )
Select the do/while
else
if( it's pure counter-control )
Select the for
else //for anything else
Select the while