How to use string in c language

In C language, strings are represented by character arrays. Define a string through the syntax char str[] = "this is a string";. String operations include: 1. Access elements (subscript access); 2. Get the length (strlen() function); 3. Compare strings (strcmp() function); 4. Copy strings (strcpy() function); 5. Connect strings (strcat() function); 6. Search for substrings (strstr() function).

String in C language

##1. Introduction

String is a commonly used data type in programming and is used to store text data. In C language, strings are represented using character arrays.

2. Define strings

Define strings through the following syntax:

<code class="c">char str[] = "this is a string";</code>

3. String operations

1. Access string elements

Use the subscript of the character array to access elements in the string:

<code class="c">printf("%c", str[0]); // 输出 "t"</code>

2. Get characters String length

Use the strlen() function to get the length of the string:

<code class="c">int len = strlen(str); // len 为字符串的长度</code>

3. Compare strings

Use strcmp() The function compares two strings:

<code class="c">int result = strcmp(str1, str2);
// result > 0 表示 str1 大于 str2
// result < 0 表示 str1 小于 str2
// result = 0 表示 str1 等于 str2</code>

4. Copy a string

Use the strcpy() function to copy one string to another:

<code class="c">strcpy(str2, str1); // str2 现在包含 str1 的内容</code>

5. Concatenate strings

Use the strcat() function to concatenate two strings:

<code class="c">strcat(str1, str2); // str1 现在包含 str1 和 str2 连接的内容</code>

6. Search for substrings

Use the strstr() function to search for substrings in a string:

<code class="c">char* pos = strstr(str1, "substring");
// 如果找到子字符串，pos 指向子字符串的第一个字符
// 否则，pos 为 NULL</code>

4. End

Strings are very important in C language A data type used to store and manipulate text data. Mastering string manipulation is very helpful in programming.

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