How can I prevent scientific notation and display floating-point numbers in a fixed format using C ?

Maintaining Precision in Floating-Point Output

When printing double-precision numbers using the stream insertion operator (<<), it is possible for the output to be represented in scientific notation. However, in certain scenarios, it may be desirable to prevent this and instead display the number in a fixed format.

To achieve this, specific formatting options can be applied to the output stream using the iomanip library. Here's how it's done:

setprecision(n): This manipulates the number of decimal places displayed. Once set, this precision persists until explicitly unset.

fixed: Enforces a consistent output format for floating-point numbers, ensuring that precision is maintained for all values.

showpoint: Forces the inclusion of decimal points, even if no fractional portion exists.

For example, to specify that double-precision numbers should be displayed with 4 decimal places, the following code can be used:

#include 

std::ofstream outfile;
outfile << std::fixed << std::showpoint;
outfile << std::setprecision(4);
outfile << x;

By utilizing these formatting options, you can control the precision and format of floating-point output, preventing scientific notation and ensuring consistent display.
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