Simple C programs for string.h function

Below are some main string.h functions, click on anyone and go directly to that program.
strlen(),  strcat(),  strcpy(),  strcmp()



Program:

1) strlen(): used to find length of string

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

void main()
{
    int l;
    char s[20];

    printf("Enter String: ");
    gets(s);
    l=strlen(s); /* length of string will be stored in l */

    printf("length of string is: %d",l);
    getch();
}

Output:
Enter String: SlashMyCode.com
length of string is: 15


2) strcat(): used to join two strings.

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

void main()
{
    int l;
    char s1[40],s2[40];

    printf("Enter String 1: ");
    gets(s1);
    printf("Enter String 2: ");
    gets(s2);

    strcat(s1,s2); /* join two strings i.e s1, s2 and new string is stored in s1 */

    printf("Concatenated string is: ");
    puts(s1);

    getch();

}

Output:
Enter String 1: Get C Programs from:
Enter String 2: SlashMyCode.com

Concatenated string is: Get C Programs from: SlashMyCode.com

3) strcpy(): used to copy 2nd string over 1st

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

void main()
{
    char s1[40],s2[40];

    printf("Enter String 1: ");
    gets(s1);
    printf("Enter String 2: ");
    gets(s2);

    strcpy(s1,s2); /* overwrites 2nd strings over 1st and store it in s1 */

    printf("1st string is: ");
    puts(s1);
    getch();

}

Output:

Enter String 1: Hiii

Enter String 2: Hello!

1st string is: Hello!

4) strcmp(): used to compare two strings according to ascii values of characters in string

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

int main()
{
    char s1[20], s2[20];
    int result;

    printf("Enter String 1: ");
    gets(s1);
    printf("Enter String 2: ");
    gets(s2);

    result = strcmp(s1,s2); /* comparing strings s1 and s2 */
    printf("Result = %d\n",result);

    getch();
}

Output: Enter String 1: abc
Enter String 2: xyz

Result = -1

Note: 
0  = both strings are equal 
-1 = if the ASCII value of first character is less than second.
1  = if the ASCII value of first character is greater than second.               (see ASCII table)