How to use string in c language

In C language, string ends with '\0', which is used to store and process strings. Specific usages include: declare string: char string_name[size]; initialize string: char string_name[] = "content"; access element: string_name[index]; obtain length: strlen(string_name); compare string: strcmp(string1, string2) ;String function: strlen() returns length, strcmp() compares, strcpy() copies, strcat() appends.

Usage of string in C language

string is used to store and process strings in C language Character array. It is terminated with '\0' (null character) to indicate the end of the string.

Usage of string

• Declare string:

  <code class="C">char string_name[size];</code>

• Initialize string:

  <code class="C">char string_name[] = "Hello World";</code>

• Access string element:

  <code class="C">string_name[index];</code>

• ##Get the string length :

  <code class="C">strlen(string_name);</code>

• Compare strings:

  <code class="C">strcmp(string1, string2);</code>

string function

C language provides the following string functions:

• strlen(): Returns the string length.
• strcmp(): Compares two strings and returns 0 for equality, otherwise a non-zero value is returned.
• strcpy(): Copy one string to another string.
• strcat(): Appends one string to another string.

string example

<code class="C">#include <stdio.h>

int main() {
    char string1[] = "Hello";
    char string2[] = "World";

    printf("%s\n", string1);  // 输出：Hello
    printf("%d\n", strlen(string1));  // 输出：5

    strcpy(string2, string1);  // 将string1复制到string2
    printf("%s\n", string2);  // 输出：Hello

    strcat(string2, "!");  // 将"!"附加到string2
    printf("%s\n", string2);  // 输出：Hello!

    return 0;
}</code>

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