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lecture2

# lecture2 - Monday,Oct11 #1 Moreaboutvariables Newoperators...

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Monday, Oct 11 th Questions about Project #1? Week 1 review challenge A potpourri of new topics More about variables New operators (+=, ++, etc.) The if statement String variables…

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Time for your favorite game! Programming Language Inventor  Or Serial Killer See if you can guess who uses a keyboard and who uses a  chainsaw!
Review Challenge This program computes the average of 2 numbers and prints the result. Find  the syntax & semantic errors. #include <iostream> int main(void) { int sum, a, b; std::cout << “Enter 2 numbers:\n“; std :: cin >> a; sum = sum + a; std::c in >> b sum = sum + b; sum = sum / 2; std::cout >> “Average: “ + sum; ; )

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Review Challenge #include <iostream> int main(void) { int n; std::cout << “Enter n: “; std::cin >> n; // add your code here std::cout << ;        std::cout << ; std::cout << ; } Given a number,  n , in seconds, print out the number of hours, minutes and  seconds that n represents. Hint : Use regular division and  modulo division E.g. if the user types in 7265, the  program should print: Hours: 2 Minutes: 1  Seconds: 5
More About Variables Learn how to use char  variables. Learn how to initialize more  than one variable at a time Learn about const variables Learn some new C++  operators Linda writes her first C++  program…

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char variables int main(void) { char small_num; small_num = -125; // this is OK! Last time we learned that char  variables can hold numbers  between -127 and 128. To assign a symbolic value to a character variable, use  single quotation  marks  ‘ and ’. You print out character variables just like you do any other variable.  char variable  can also hold a  symbolic character, like a letter  or a punctuation mark. char grade, punct; grade = ‘ A ’; punct = ‘ \$ ’; cout << “Your grade is: “ << grade; }
char variables #include <iostream> int main(void) { char grade; cout << “Enter desired grade: “; cin >> grade; cout << “You don’t deserve a “ << grade; } You can also prompt  the user to input a  single character using  std::cin . The user can type in  a single character  and then hit the  enter key. grade        ‘P’ Enter desired grade: B ‘B’ You don’t deserve a B

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#include <iostream> int main(void) { int a, b, c; a = b = c = 5; } Assigning Multiple Variables at The  Same Time Sometimes its convenient to assign many variables to  the same value at once. This is how you do it. #include <iostream> int main(void) { int a, b, c; c = 5; b = c; a = b; } And here’s how C++ treats it.
Const Variables What’s wrong with this program? #include <iostream> int main(void) { double rad; std::cout << “Enter the radius of your zit: “; std::cin >> rad; std::cout << “Zit circumference: “ << 2 * rad * 3.141; std::cout << “Zit area: “ << rad*rad * 3.141; } Hint: 1.What do we have to do to our program         to get increased precision (3.141 ->3.14159)?

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Const Variables #include <iostream> int main(void) { const double PI = 3.14;
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