Double is the data type of the following function prototype's parameter variable.
The high-precision floating-point data or numbers are stored using the C double data type (up to 15 to 17 digits). Large decimal number values are stored there. The amount of data that can be stored in values is twice what can be stored in float data. It is called a double data type as a result. In the C programming language, the double data type is used to hold high-precision floating-point data or integers in computer memory. Because it can carry data that is twice as large as float data type, it is known as the double data type. A double is 8 bytes long, or 64 bits, in total.
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