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Chapter 2: Problem 10

What statements should you include in your program to ensure that, when a number of type double is output, it will be output in ordinary notation with three digits after the decimal point?

Short Answer

Expert verified
Answer: You can use the "fixed" and "setprecision" manipulators from the iomanip library to achieve this. First, include the iostream and iomanip libraries. In the output statement, use std::fixed to display the number in decimal format and std::setprecision(3) to set the number of digits after the decimal point to 3. This will display the output in ordinary notation with three digits after the decimal point.

Step by step solution

01

Include iostream library

To start, make sure to include the iostream library, which allows us to perform input and output operations in C++. ```cpp #include ```
02

Include iomanip library

Also, you need to include the iomanip library, which contains the I/O manipulators we will use for this task. ```cpp #include ``` Step 2: Set Precision and Display Format
03

Set Precision

Use the "setprecision" manipulator in the output statement to set the number of digits to be displayed after the decimal point. In this case, it should be 3. ```cpp std::cout << std::setprecision(3); ```
04

Fix Display Format

Use the "fixed" manipulator in the output statement to ensure that the number is displayed in decimal format (as opposed to scientific notation). ```cpp std::cout << std::fixed; ``` Example Program: ```cpp #include #include int main() { double number = 123.456789; // Display number with 3 digits after the decimal point in ordinary notation std::cout << std::fixed << std::setprecision(3) << number << std::endl; return 0; } ```

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Most popular questions from this chapter

Consider a quadratic expression, say \\[ x^{2}-x-2 \\] Describing where this quadratic is positive (that is, greater than 0 ). involves describing a set of numbers that are either less than the smaller root (which is -1 ) or greater than the larger root (which is +2 ). Write a \(\mathrm{C}++\) Boolean expression that is true when this formula has positive values.

Give an input statement that will fill the variable the_number (of type \(i n t)\) with a number typed in at the keyboard. Precede the input statement with a prompt statement asking the user to enter a whole number.

Give a \(\mathrm{C}++\) statement that will increase the value of the variable length by \(8.3 .\) The variable length is of type double.

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Write an \(i f\) -else statement that outputs the word Passed provided the value of the variable exam is greater than or equal to \(6 \theta\) and the value of the variable programs_done is greater than or equal to \(10 .\) Otherwise, the if-else statement outputs the word Failed. The variables exam and programs_done are both of type int.
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