How to calculate the length of a string using the LEN function

How to use the LEN function to count the length of a string requires specific code examples

In programming, you often encounter situations where you need to count the length of a string. In this case, you can Use the LEN function to achieve this. The LEN function is a commonly used string function. It can return the number of characters in a given string and is very convenient and practical. The following will introduce how to use the LEN function to count the length of a string and give specific code examples.

First of all, we need to understand the basic usage of the LEN function. The syntax of the LEN function is as follows:

LEN(string)

Among them, string is the string whose length is to be counted. For example, we have a string variable str = "Hello World!", we can use the LEN function to count its length, the code is as follows:

str = "Hello World!"
length = LEN(str)
print("字符串的长度是：", length)

The output result of the above code is:

字符串的长度是： 12

Next, we will give some specific examples to demonstrate how to use the LEN function to count string lengths in different situations.

Example 1: Count the length of the string entered by the keyboard

Suppose we need to count the length of the string entered by the user from the keyboard. We can use the input function to get the string entered by the user, and then use the LEN function to count its length. The sample code is as follows:

str = input("请输入一个字符串：")
length = LEN(str)
print("字符串的长度是：", length)

Example 2: Count the length of strings in the file

Suppose we have a text file that contains multiple strings, and we need to count the length of each string . We can count the string length by opening the file, reading the file content line by line, and using the LEN function on each line. The sample code is as follows:

filename = "example.txt"
with open(filename, "r") as file:
    for line in file:
        length = LEN(line)
        print("字符串", line, "的长度是：", length)

Example 3: Count the length of strings in the list

Suppose we have a list containing multiple strings, and we need to count the length of each string. We can use a loop to iterate through the list and use the LEN function on each string to count the length. The sample code is as follows:

strings = ["apple", "banana", "cherry", "durian"]
for string in strings:
    length = LEN(string)
    print("字符串", string, "的长度是：", length)

Through the above examples, we can see how to use the LEN function to count the length of strings in different situations. The LEN function is a simple and practical function that is often used in string processing. By using the LEN function, we can more easily obtain the length of the string for subsequent processing or analysis.

To summarize, the LEN function is a function used to count the length of a string, and can easily obtain the number of characters in a string. In programming, you can use the LEN function to implement string length statistics and perform corresponding processing according to specific usage scenarios. I hope the above introduction and examples can help readers better understand and apply the LEN function.

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