cs-142:more-data-types-work [CS Wiki]

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--- cs-142:more-data-types-work [2014/09/16 09:22]
kseppi created
+++ cs-142:more-data-types-work [2016/09/10 15:35] (current)
kseppi
@@ Line 1: / Line 1: @@
 <code cpp>
 #include<iostream>
-#include<iomanip>
 #include<string>
 using namespace std;
 int main() {
-	cout << "\tPI:\n\n";
-	// PI
+   /* Try this for input:
-	const double PI = 4.0*atan(1.0);
-	cout << "PI is " << PI << endl;
+      Kevin
+      Kevin D Seppi
+      Kevin
-	// Formatting role play, then
+      Kevin
-	cout << endl << "\tFORMATTING:\n\n";
+   */
-	double a_cool_number = PI;
-	int another_cool_number = 7;
+	cout << "strings:" << endl;
-	cout << "The way it comes out by default: " << a_cool_number << endl;
-	// we can change that: (note #include of iomanip!)
-	cout << "The way it comes out modified by fixed and setprecision: " << fixed << setprecision(3) << a_cool_number << endl;
-	// we can try to change that:
-	cout << "The way it comes out modified by setw too small: " << setw(3) << a_cool_number << endl;
-	// we can change that:
-	cout << "The way it comes out modified by setw more than big enough: " << setw(13) << a_cool_number << endl;
-	// we can change that:
-	cout << "The way it comes out modified by setw but only affect next thing " << setw(13) << another_cool_number << " and " << a_cool_number << endl;
-	// We have not changed a_cool_number
-	cout << "The way it comes out enlarging the precision: " << fixed << setprecision(8) << a_cool_number << endl;
-	cout << endl << "\tROUNDING:\n\n";
-	// from last time: c++ does not round
-	double price = 12345.53;
-	int about_dollars = price;
-	cout << "price " << price << " or rounded is " << about_dollars << " dollars??\n";
-	// but you can ask it to:
-	about_dollars = round(price);
-	cout << "price " << price << " or rounded is " << about_dollars << " dollars.\n";
-	// round was added in c++11 so it may not work in earlier versions. Also Microsoft
-	// did not put this feature in visual studio until the 2013 version.
-	// The old way to round was:
-	about_dollars = price + 0.5;
-	cout << "price " << price << " or rounded is " << about_dollars << " dollars.\n";
-	// rounded to the nearest 100
-	cout << "price " << price << " or rounded to the nearest 100 is " << 100*round(price/100) << " dollars.\n"; // is / ok?
-	cout << endl << "\tstring:\n\n";
 	// string type:
 	// don't forget the include!
-	string first_name = "Kevin";
+	string firstName = "Kevin";
-	string last_name = "Seppi";
+	string lastName = "Seppi";
-	cout << "My name is " << first_name << endl;
+	cout << "My name is " << firstName << endl;
-	string full_name = first_name + " " + last_name;
+	string fullName = firstName + " " + lastName;
-	cout << "my full name is " << full_name << endl;
+	cout << "my full name is " << fullName << endl;
-	// string functions are different from the ones we have seen so far atan and round
+	// Remember that this works:
-	int name_length = full_name.length();
+	cout << "Some sum! " << 23 + 34 << endl;
-	cout << "The length of my name is " << name_length << endl;
+	// But this will not:
-	// other string functions: _verb, nor for you.
+	// cout << "Failed Concatination: " << "some"+"more" << endl;
+	// string can be tell us more than just their contents:
+	int nameLength = fullName.length();
+	cout << "The length of my name is " << nameLength << endl;
 	// extracting parts of a string, note that it starts with position 0
-	cout << "The first character is \"" << full_name.substr(0,1) << "\"" << endl;
+	cout << "The first character is \"" << fullName.substr(0,1) << "\"" << endl;
 	// more interesting parts:
-	string middle_part = full_name.substr(name_length / 2 - 2, 6);
+	string middlePart = fullName.substr(nameLength / 2 - 2, 6);
-	cout << "The middle 6 characters are \"" << middle_part << "\"" << endl;
+	cout << "The middle 6 characters are \"" << middlePart << "\"" << endl;
+        cout << endl;
-	cout << endl << "\tCIN:\n\n";
+	cout << "CIN:" << endl;
 	// from last time:
-	int favorite_number;
+	int favoriteNumber;
 	cout << "Please give me your favorite number:";
-	cin >> favorite_number;
+	cin >> favoriteNumber;
+	cout << endl;
-	cout << "\nHey, I know you, your favorite number is " << favorite_number << endl;
+	cout << "Hey, I know you, your favorite number is " << favoriteNumber << endl;
-	// try again but give "abc" as your favorite number.
-	// I wish we had a way to check for bad input and do some thing about it!
 	// we can do this with strings too
-	int users_name;
+	string usersName;
 	cout << "Please give me your first name: ";
-	cin >> first_name;
+	cin >> firstName;
+	cout << endl;
-	cout << first_name << " is a funny name!!\n";
+	cout << firstName << " is a great name!!" << endl;
 	//But be careful with stings:
 	cout << "Please give me your full name: ";
-	cin >> full_name;
+	cin >> fullName;
+	cout << endl;
-	cout << full_name << " really!!\n";
-	cin >> last_name;
+	cout << "Full name: " << fullName << "?? really!!" << endl;
-	cout << last_name << " is the rest of it.\n";
+	cout << "Please let me try again, give me your full name: ";
+	getline(cin,fullName);
+	cout << endl;
+	cout << "Full name: " << fullName << " What?" << endl;
 	// back to numbers
 	// errors in cin
-	int interesting_number;
+	int interestingNumber;
 	cout << "I am expecting a number, try something unexpected:";
-	cin >> interesting_number;
+	cin >> interestingNumber;
-	cout << "\nI saw: " << interesting_number << endl;
+	cout << endl;
-	cout << "What?\n\nMaybe this will help, give bad input here:\n";
+	cout << "Interesting Number: " << interestingNumber << endl;
-	cout << "Please give me your favorite number:";
+	cout << "What?" << endl;
-	cin >> favorite_number;
+	cout << endl;
+	cout << "Maybe this will help, give bad input here:" << endl;
-	cout << "\nHey, I know you, your favorite number is " << favorite_number << endl;
+	cout << "Please give me bad input for your favorite number:";
+	cin >> favoriteNumber;
+	cout << endl;
+	cout << "Hey, I know you, your favorite number is " << favoriteNumber << endl;
+	cout << "Hmmm." << endl;
 	// I sure wish I could tell when input failed and do something about it!!
+	//system("pause");
-	system("pause");
 	return 0;
 }
 </code>

cs-142/more-data-types-work.1410880941.txt.gz · Last modified: 2014/09/16 09:22 by kseppi

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