 for loop  while loop  do-while loop

for (begin point; end point ; incrementation ) { //statements to be repeated }

for (c = 0; c < 10 ; c++ ) { cout << “You get no bull from this Kow\n”; }

while ( condition ) { //statements to be repeated }

int x = 1; while ( x < 10 ) { cout << x << “ “ << x*x << “\n”; x = x +1; }

do { //statements to be repeated } while ( condition );

float inch = 1.0; do { cout << inch << “ inch = “ << inch * 2.54 << “ cm\n”; inch = inch + 1.0; } while ( inch < 10 );

1.Read in a line of text followed by a return. 2.Count the number of characters in the line. 3.Repeat steps 1 & 2 as many times as the user desires.

again Promt for sentence Initialize length to 0 Read char. into ch ch != ‘\n’ Increment length by 1 Read next char. into ch ch Print length of text again == ‘y’ Prompt and read into again

#include using std::cin; using std::cout; using std::endl; int main() { char ch, again; int length; do { cout." << " I'll tell you length" << endl; lenth = 0; cin.get(ch); // "primes" the loop while (ch != '\n') { length++; cin.get(ch); } cout << endl << "Your sentence is " << length << " characters long.\n" << endl; cout << "More input ?? "; cin >> again; cin.ignore(); } while (again == 'y'); return 0; }

#include using std::cin; using std::cout; using std::endl; int main() { char ch, again; int length;

do { cout." << " I'll tell you length" << endl; length = 0; cin.get(ch); // "primes" the loop while (ch != '\n') { length++; cin.get(ch); } cout << endl << "Your sentence is " << length << " characters long.\n" << endl; cout << "More input ?? "; cin >> again; cin.ignore(); } while (again == 'y'); return 0; }

do { cout." << " I'll tell you length" << endl; length = 0; cin.get(ch); // "primes" the loop while (ch != '\n') { length++; cin.get(ch); } cout << endl << "Your sentence is " << length << " characters long.\n" << endl; cout << "More input ?? "; cin >> again; cin.ignore(); } while (again == 'y'); return 0; }

do { cout." << " I'll tell you length" << endl; lenth = 0; cin.get(ch); // "primes" the loop while (ch != '\n') { length++; cin.get(ch); } cout << endl << "Your sentence is " << length << " characters long.\n" << endl; cout << "More input ?? "; cin >> again; cin.ignore(); } while (again == 'y'); return 0; }

do { cout." << " I'll tell you length" << endl; lenth = 0; cin.get(ch); // "primes" the loop while (ch != '\n') { length++; cin.get(ch); } cout << endl << "Your sentence is " << length << " characters long.\n" << endl; cout << "More input ?? "; cin >> again; cin.ignore(); } while (again == 'y'); return 0; }

do { cout." << " I'll tell you length" << endl; lenth = 0; cin.get(ch); // "primes" the loop while (ch != '\n') { length++; cin.get(ch); } cout << endl << "Your sentence is " << length << " characters long.\n" << endl; cout << "More input ?? "; cin >> again; cin.ignore(); } while (again == 'y'); return 0; }

do { cout." << " I'll tell you length" << endl; lenth = 0; cin.get(ch); // "primes" the loop while (ch != '\n') { length++; cin.get(ch); } cout << endl << "Your sentence is " << length << " characters long.\n" << endl; cout << "More input ?? "; cin >> again; cin.ignore(); } while (again == 'y'); return 0; }

do { cout." << " I'll tell you length" << endl; lenth = 0; cin.get(ch); // "primes" the loop while (ch != '\n') { length++; cin.get(ch); } cout << endl << "Your sentence is " << length << " characters long.\n" << endl; cout << "More input ?? "; cin >> again; cin.ignore(); } while (again == 'y'); return 0; }

1.A for loop is generally used when you know how many times you want to repeat a section of code. 2.When you don’t know how many times you want to repeat a section of code but you want to specify a condition in which the code is to be repeated, use a while or a do-while loop. 3.A do-while loop is used when you want the code to be executed at least once. In a do- while, the test is done at the end of the loop 4.In a while loop, the condition is checked at the beginning of the loop. If the condition is false, the body of the loop will never be executed.

 for loop  while loop  do-while loop