What does double mean in c++

The doubledouble in C is a data type used to represent double-precision floating point numbers. It provides higher precision and value range, can represent very large or very small numbers, and is needed in scientific or engineering applications. Used in high-precision scenes.

double in C

double is a data type in C, used for Represents a double-precision floating point number. It can represent very large or very small numbers and is more precise than float (single-precision floating point numbers).

Features:

• Precision: double type has 53 significant bits, and the floating point exponent range is [-1022, 1023] , provides higher precision than float.
• Value range: The minimum positive value that double can represent is about 2.23e-308, and the maximum positive value is about 1.79e 308.
• Storage space: In most systems, double occupies 8 bytes.

Usage:

• Declare double variable:

  <code class="cpp">double myDouble;</code>

• Assign value to double variable :

  <code class="cpp">myDouble = 3.14;</code>

• Perform arithmetic operations:

  <code class="cpp">double result = myDouble + 1.2;</code>

The difference between float and float:

double and Float is a floating-point number type, but double has greater precision and value range. Therefore, when higher precision floating point numbers are required, the double type should be used.

When to use double:

• Calculations involving large or small numbers
• Scientific or engineering applications that require high precision
• When compatibility with other programming languages ​​is required, they use double to represent floating point numbers

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