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cs-142:more-data-types-work [2016/09/05 20:06]
kseppi
cs-142:more-data-types-work [2016/09/10 15:35] (current)
kseppi
Line 1: Line 1:
 <code cpp> <code cpp>
 #​include<​iostream>​ #​include<​iostream>​
-#​include<​iomanip>​ 
 #​include<​string>​ #​include<​string>​
    
Line 7: Line 6:
    
 int main() { int main() {
- cout << "​\tPI:​\n\n";​ +    
- // PI +   ​/* Try this for input: 
- const double PI = 3.14159; // approaximately +      42 
- // I use this sometimes: const double PI = 4.0*atan(1.0);​ +      ​Kevin 
- cout << "PI is " << PI << endl;+      Kevin D Seppi 
 +      Kevin 
 +      Kevin 
 +   */
    
-  
- // Formatting role play, then 
- cout << endl << "​\tFORMATTING:​\n\n";​ 
- double aCoolNumber = PI; 
- int anotherCoolNumber = 7; 
- cout << "The way it comes out by default: " << aCoolNumber << endl; 
- // we can change that: (note #include of iomanip!) 
- cout << "The way it comes out modified by fixed and setprecision:​ " << fixed << setprecision(3) << aCoolNumber << endl; 
- cout << "The way it comes out modified by fixed and setprecision (rounding!):​ " << fixed << setprecision(4) << aCoolNumber << endl; 
- cout << "We round the output but not the value itself: " << fixed << setprecision(5) << aCoolNumber << endl; 
- cout << "The way it comes out modified by setw too small (*10000 to make it big): " << setw(3) << aCoolNumber*10000 << endl; 
- cout << "The way it comes out modified by setw more than big enough: " << setw(13) << aCoolNumber << endl; 
- cout << "The way it comes out modified by setw but only affect next item: " << setw(13) << anotherCoolNumber << " and " << aCoolNumber << endl; 
- cout << "The way it comes out modified by setw on both items: " << setw(13) << anotherCoolNumber << " and " << setw(13) << aCoolNumber << endl; 
- cout << "The way it comes out enlarging the precision: " << fixed << setprecision(8) << aCoolNumber << endl; 
-  
- cout << endl << "​\tROUNDING:​\n\n";​ 
-  
- // from last time: c++ does not round 
- double priceOfCar = 12345.53; 
- int roundedPrice = priceOfCar; 
- cout << "price " << priceOfCar << " or rounded is " << roundedPrice << " dollars??​\n";​ 
- // but you can make it round: 
- roundedPrice = priceOfCar + 0.5; 
- cout << "price " << priceOfCar << " or rounded is " << roundedPrice << " dollars.\n";​ 
- // rounded to the nearest 100 
- cout << "price " << priceOfCar << " or rounded to the nearest 100 is " << 100*(static_cast<​int>​(priceOfCar/​100+0.5)) << " dollars.\n";​ // is / ok? 
-   cout << endl; 
-    
  cout << "​strings:"​ << endl;  cout << "​strings:"​ << endl;
    
Line 51: Line 24:
  string fullName = firstName + " " + lastName;  string fullName = firstName + " " + lastName;
  cout << "my full name is " << fullName << endl;  cout << "my full name is " << fullName << endl;
 + // Remember that this works:
 + cout << "Some sum! " << 23 + 34 << endl;
 + // But this will not:
 + // cout << "​Failed Concatination:​ " << "​some"​+"​more"​ << endl;
 +
  // string can be tell us more than just their contents:  // string can be tell us more than just their contents:
  int nameLength = fullName.length();​  int nameLength = fullName.length();​
Line 59: Line 37:
  string middlePart = fullName.substr(nameLength / 2 - 2, 6);  string middlePart = fullName.substr(nameLength / 2 - 2, 6);
  cout << "The middle 6 characters are \""​ << middlePart << "​\""​ << endl;  cout << "The middle 6 characters are \""​ << middlePart << "​\""​ << endl;
-   cout << endl; +        ​cout << endl; 
-   ​+ 
  cout << "​CIN:"​ << endl;  cout << "​CIN:"​ << endl;
    
Line 90: Line 68:
  cout << endl;  cout << endl;
    
- cout << "Full name: " << fullName << "That is better." << endl;+ cout << "Full name: " << fullName << " ​What?" << endl;
    
  // back to numbers  // back to numbers
cs-142/more-data-types-work.1473127590.txt.gz · Last modified: 2016/09/05 20:06 by kseppi
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