visual studio - How to properly set precision for doubles in C++ -

i'm working on project need math , give user output dollars in it, have console tell user answer $20.15 instead of $20.153. used set precision function such: cout << setprecision(2);, rather have numbers become want them be, converted scientific notation.

i'm outputting lot of numbers, having function setprecision best me ease of use.

how have numbers displayed 2 decimal places , not have console give me numbers in scientific notation?

thanks

nathan

edit:

here part of code i'm having problems with:

int main() {  cout << setprecision(2);  if (totalcosthybrid < totalcostnonhybrid) {             cout << "hybrid car: " << endl;             cout << "total cost: " << totalcosthybrid << endl;             cout << "total gallons used: " << milesperyear / hybrideffic << endl;             cout << "total gas cost: " << gascosthybrid << endl;             cout << "non-hybrid car: " << endl;             cout << "total cost: " << totalcostnonhybrid << endl;             cout << "total gallons used: " << milesperyear / nonhybrideffic << endl;             cout << "total gas cost: " << gascostnonhybrid << endl;             cout << "hybrid cheaper!" << endl; } 

obviously there's more it, need with.

to fix that, should use fixed floating-point notation cout. can find more info here.

try addind cout << fixed code, code below. set precision 2, can use precision property.

cout << fixed; cout.precision(2); 

here complete code:

using namespace std;  int main() {      cout << fixed;     cout.precision(2);      if (totalcosthybrid < totalcostnonhybrid) {             cout << "hybrid car: " << endl;             cout << "total cost: " << totalcosthybrid << endl;             cout << "total gallons used: " << milesperyear / hybrideffic << endl;             cout << "total gas cost: " << gascosthybrid << endl;             cout << "non-hybrid car: " << endl;             cout << "total cost: " << totalcostnonhybrid << endl;             cout << "total gallons used: " << milesperyear / nonhybrideffic << endl;             cout << "total gas cost: " << gascostnonhybrid << endl;             cout << "hybrid cheaper!" << endl;      } }