What is the significance of setprecision manipulator in C++ programming?
Why is setprecision manipulator important in C++ programming?
Given the following variable definition double exam = 1.2345678; What is the output based on the stream manipulator setting shown below?
a. 1.2346
b. 1.235
c. 1.2346
d. 1.23
Final answer: Option b is correct.
Explanation
In C++ programming, the setprecision manipulator is important because it allows you to control the number of digits displayed after the decimal point when outputting floating-point numbers.
Given the variable definition double exam = 1.2345678;, using 'cout << setprecision(4);' would output '1.235'.Understanding setprecision manipulator
The setprecision manipulator in C++ is part of the iomanip library and is used to set the precision of floating-point numbers when they are output to the console. By specifying a precision value, you can control the number of digits that will be displayed after the decimal point.
In the example provided, the variable exam is defined as 1.2345678. When the setprecision(4) manipulator is applied before outputting the variable using cout, only the first 4 digits after the decimal point will be displayed. This means that the output will be rounded to 1.235 instead of showing the full value of 1.2345678.
It is important to note that setprecision affects the entire output stream, so any subsequent floating-point numbers output using cout will also adhere to the specified precision setting.
Understanding how to use setprecision manipulator can be beneficial in scenarios where you need to present data with specific decimal precision or format output for better readability.