Use of fixed and setprecision

// Manipulators (Stream operator) // detailed parsing // use of stream operator fixed and setprecision # include <iostream> # include <iomanip> using namespace STD; int main () {double num = 123.45678; // by default, the maximum number of digits (including before and after the decimal point) displayed in the data is 6 digits, rounded to five. Cout <num <Endl; // setprecision indicates that the number of digits is 7 bits. Therefore, the cout number is rounded to <setprecision (7) <num <Endl; // If fixed is placed before setprecision, setprecision (2) specifies the number of digits to display after the decimal point. cout <fixed <setprecision (2) <num <Endl; return 0 ;}

Output result:
123.457
123.4568
123.46