How to retain two decimal places in c++ output
In C, use the `std::fixed` and `std::setprecision` functions (defined in the `
` header file) to preserve two decimal places in the output. `std::fixed` sets the output format to a fixed decimal point format, while `std::setprecision(2)` specifies keeping two decimal places.
In C, if you want to retain two decimal places when outputting, you can use std::setprecision and std::fixed functions, they are all defined in the
cpp
#include <iostream> #include <iomanip> int main() { double num = 3.141592653589793; std::cout << std::fixed << std::setprecision(2) << num << std::endl; return 0; }
In this example, std: :fixed sets the output format to a fixed decimal point format, and std::setprecision(2) sets the number of digits retained after the decimal point to 2. In this way, the output result is 3.14.
In addition, you also need to note that although std::setprecision sets the number of digits after the decimal point, it will not be rounded. If you need to round, you can use the std::round function, which is defined in the
cpp
#include <iostream> #include <iomanip> #include <cmath> int main() { double num = 3.141592653589793; num = std::round(num * 100.0) / 100.0; std::cout << std::fixed << std::setprecision(2) << num << std::endl; return 0; }
In this example, we first Multiply num by 100, then round, and finally divide by 100 to get the result to two decimal places. The output is still 3.14.
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