In programming, float, int, and double are three different data types used to store different types of numeric values. Here is their basic usage:
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1. int: Used to represent integer variables (such as -10, 0, 100, etc.), and can perform basic operations (such as addition, subtraction, multiplication, division, etc.). Sample code:
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Int = 10;
Int b = 20;
Int c = a b;
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2. float: Used to represent single-precision floating point numbers (such as 3.14, 1.5, etc.), can perform basic operations (such as addition, subtraction, multiplication, division, etc.). Sample code:
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浮点PI = 3.14;
浮动r = 2.5;
浮动面积= PI * r * r;
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3. double: Used to represent double-precision floating point numbers (such as 3.141592653589793, 1.2345678, etc.), which can perform basic operations (such as addition, subtraction, multiplication, division, etc.). double is more accurate than float, but it also takes up more space. Sample code:
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双PI = 3.141592653589793;
双r = 2.5;
双面积= PI * r * r;
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It should be noted that the data range and accuracy issues should be considered when using these data types to ensure the correctness and efficiency of the program. At the same time, it is also necessary to understand the value range and occupy space of various data types, so as to make a reasonable choice and use when writing programs.
int refers to an integer variable, which can only be defined as an integer, such as -1,100. However, this integer has a range, not infinitely large, not infinitely small. For example, the TC2.0 system allocates 2 bytes of storage space to the int variable by default, that is, 16 bits, so the range of int shaping in this system is (-32768 ~ 32767). If you want to define a larger number, you can define it with a long int.A float is floating point data, a decimal. Such as 1.2, -2.3, 3.0 and so on. In the TC2.0 system, 4 bytes are allocated to a float data by default, one part is used to store the integer part and the other part is used to store the decimal part. So, this floating point number is neither infinitely large nor infinitely small. So, to define larger floating point data, we use double float(float can be omitted). It's kind of similar to the use of long in int.ps: A number larger than double can be defined as a long double.thank you