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Printing the correct number of decimal points with cout in C++
Here we will see how to print some floating point numbers up to some pre-defined decimal places. In C++, we can use setprecision with the cout to do this word. This is present under the iomanip header file in C++.
Example Code
#include <iostream> #include <iomanip> using namespace std; int main() { double x = 2.3654789d; cout << "Print up to 3 decimal places: " << setprecision(3) << x << endl; cout << "Print up to 2 decimal places: " << setprecision(2) << x << endl; cout << "Print up to 7 decimal places: " << setprecision(7) << x << endl; }
Output
Print up to 3 decimal places: 2.365 Print up to 2 decimal places: 2.37 Print up to 7 decimal places: 2.3654789
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