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cs-142:formatting [2016/09/06 22:24] (current)
kseppi created
Line 1: Line 1:
 +<code cpp>
 +#​include<​iostream>​
 +#​include<​iomanip>​
 +#​include<​string>​
 + 
 +using namespace std;
 + 
 +int main() {
  
 + cout << "​\tPI:​\n\n";​
 + // PI
 + const double PI = 3.14159; // approximately
 + // I use this sometimes: const double PI = 4.0*atan(1.0);​
 + cout << "PI is " << PI << endl;
 + 
 + 
 + // 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;
 + 
 + //​system("​pause"​);​
 + return 0;
 +}
 +</​code>​
cs-142/formatting.txt ยท Last modified: 2016/09/06 22:24 by kseppi
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