How to use setprecision in C++

Question

I am new in C++ , i just want to output my point number up to 2 digits. just like if number is 3.444, then the output should be 3.44 or if number is 99999.4234 then output should be 99999.42, How can i do that. the value is dynamic. Here is my code.

#include <iomanip.h>
#include <iomanip>
int main()
{
    double num1 = 3.12345678;
    cout << fixed << showpoint;
    cout << setprecision(2);
    cout << num1 << endl;
}

but its giving me an error, undefined fixed symbol.

Answer 1

#include <iomanip> #include <iostream>  int main() {     double num1 = 3.12345678;     std::cout << std::fixed << std::showpoint;     std::cout << std::setprecision(2);     std::cout << num1 << std::endl;     return 0; } 

Answer 2

#include <iostream> #include <iomanip> using namespace std; 

You can enter the line using namespace std; for your convenience. Otherwise, you'll have to explicitly add std:: every time you wish to use cout, fixed, showpoint, setprecision(2) and endl

int main() {     double num1 = 3.12345678;     cout << fixed << showpoint;     cout << setprecision(2);     cout << num1 << endl; return 0; } 

Answer 3

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

when you are using operator overloading try this.