The difference between double and float in c language

The floating-point data type with higher precision and range, more memory usage and calculation time is double data.

The difference between double and float in C language

In C language, double and float are two types of floats. Point data type. Their differences are mainly reflected in the following aspects:

1. Precision and range

• Precision: Precision of double type data It is higher than float type data, which means it can represent more decimal values.
• Range: The valid range of double type data is also larger than that of float type data, and it can represent a wider range of values.

2. Memory allocation

• Memory size: Double type data takes up twice as much memory as float type data , that is, double is 8 bytes and float is 4 bytes.

3. Calculation performance

• Calculation speed: Since double type data has higher precision, floating point During operation, it usually takes more time than float type data.

4. Data format

• Internal representation: The internal representation of double and float type data is different, which affects how they are stored in memory.

Summary
In general, double data has higher precision and range than float data, but it also requires more memory and calculation time. When choosing which data type to use, you need to consider precision, range, memory footprint, and computational performance requirements on a case-by-case basis.

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