What is the principle of forced type conversion?

The principle of forced type conversion is to perform conversion based on the representation range and precision of the data type. Within the computer, different data types occupy different amounts of space in the memory. Convert a data type to Another data type, the computer will convert according to these different space sizes. Casting can be divided into two types, conversion from a smaller data type to a larger data type, and conversion from a larger data type to a smaller data type. It is necessary to pay attention to the representation range and precision of the data type, and avoid possible data overflow and precision loss.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Coercion is an operation that converts one data type to another data type. In programming, sometimes we need to convert one data type to another data type to meet specific needs.

The principle of forced type conversion is to perform conversion based on the representation range and precision of the data type. Within the computer, different data types occupy different amounts of space in memory. When we convert one data type to another, the computer performs the conversion based on these different space sizes.

Coercive type conversion can be divided into two situations: conversion from a smaller data type to a larger data type, and conversion from a larger data type to a smaller data type.

When we convert a smaller data type to a larger data type, such as converting an integer type to a floating point number type, the computer will automatically perform the conversion because the larger data type can accommodate larger data types. Small data type.

However, when we convert a larger data type to a smaller data type, such as converting a floating point number type to an integer type, we need to use a cast symbol to explicitly tell the computer Make the conversion. This is because smaller data types may not accommodate larger data types, and precision may be lost when converting.

When performing forced type conversion, we need to pay attention to the following points:

1. Representation range of data types: Different data types occupy different amounts of space in memory. When performing type conversion, we need to ensure that the target data type can accommodate the value of the original data type, otherwise data overflow will occur.

2. Loss of data precision: When converting larger data types to smaller data types, we need to pay attention to the possible loss of precision. For example, when converting a floating-point number type to an integer type, the decimal part is truncated, leaving only the integer part.

3. Syntax of cast: In most programming languages, we can use cast symbols to perform type conversion. For example, in C language, you can use parentheses to enclose variables that need to be converted.

Although forced type conversion can meet specific needs, it also needs to be used with caution. When performing type conversion, we need to ensure that the result of the conversion is correct and does not cause data loss or errors. Therefore, when performing forced type conversion, we need to carefully consider the necessity and possible impact of the conversion.

In short, cast is an operation that converts one data type to another data type. Its principle is to convert based on the representation range and precision of the data type. When performing forced type conversion, we need to pay attention to the representation range and precision of the data type, and avoid possible data overflow and precision loss problems.

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