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strlen()

The strlen() function returns the number of characters in a string

#include <stdio.h>
#include <string.h>

int main() {
    char name[] = "Alice";
    printf("Length of string: %d\n", strlen(name));  
    return 0;
}

Output:

Length of string: 5

strcpy() String Copy

#include <stdio.h>
#include <string.h>

int main() {
    char src[] = "Hello";
    char dest[20];  

    strcpy(dest, src);  
    printf("Copied string: %s\n", dest);
    return 0;
}

Output:

Copied string: Hello
strcat() String Concatenation

strcat() joins two strings.

#include <stdio.h>
#include <string.h>

int main() {
    char str1[20] = "Hello, ";
    char str2[] = "World!";
    
    strcat(str1, str2);
    printf("Concatenated string: %s\n", str1);
    return 0;
}
Concatenated string: Hello, World!
strcmp() String Compare

The strcmp() function compares two strings lexicographically (dictionary order).

#include <stdio.h>
#include <string.h>

int main() {
    char str1[] = "apple";
    char str2[] = "banana";

    int result = strcmp(str1, str2);

    if (result == 0)
        printf("Strings are equal\n");
    else if (result > 0)
        printf("First string is greater\n");
    else
        printf("Second string is greater\n");

    return 0;
}
Second string is greater