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CS 1400

CS 1400. Chapter 5, section 2. Loops!. while ( rel-expression ) while ( rel-expression ) { statements statement }. if the relational-expression is true, execute the statement(s) then repeat. (This is a pre-test loop). Example.

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CS 1400

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  1. CS 1400 Chapter 5, section 2

  2. Loops! while (rel-expression) while (rel-expression) { statements statement } if the relational-expression is true, execute the statement(s) then repeat. (This is a pre-test loop)

  3. Example • Convert a list of temperatures from Fahrenheit to Centigrade. • int main() • { float fahr; • char continue = ‘Y’; • while (continue == ‘Y’) • { cout << “Enter a temperature: “; • cin >> fahr; • cent = 5.0/9.0 * (fahr-32.0); • cout >> “centrigrade conversion is: “ << cent << endl; • cout >> “Enter Y to continue…”; • cin >> continue; • } • }

  4. Counting loops • Convert exactly 5 temperatures to centigrade… • int main() • { float fahr; • int count = 0; • while (count < 5) • { cout << “Enter a temperature: “; • cin >> fahr; • cent = 5.0/9.0 * (fahr-32.0); • cout >> “centrigrade conversion is: “ << cent << endl; • count = count + 1; • } • }

  5. Examples… • Write a program to output the sum of a list of positive numbers provided by the user. • Modify the above program to output the average of a list of positive numbers provided by the user. • Write a program that prompts the user to enter an age in the range 18 to 25. Re-prompt the user if an invalid age is entered.

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