String Function

 String Function

In C programming, a string function is a built-in library function designed to manipulate, manage, and perform operations on text. It is used to find the length of a given string, reverse the string, copy the string, change into upper case or lower case, compare the two strings, etc.

There are 7 string functions. They are:

strlen()

strrev()

strcat()

strupr()

strlwr()

strcmp()

strcpy()

1. strlen()

This string function is used to find the length of string. Its keyword is strlen().

For example:

#include<stdio.h>

#include<string.h>

int main()

{

    int x;

    char word[50];

    printf("enter a word ");

    scanf("%s", word);

    x = strlen(word);

    

    printf("The length of word is %d ", x);

    return 0;

}

Output:

enter a word prapti

The length of word is 6

2. strrev()

This string function is used to reverse the given string.

For example:

#include<stdio.h>

#include<string.h>

int main()

{

    char word[25];

    printf("enter a word\n ");

    scanf("%s", word);

    strrev(word);

    printf("The reversed word is %s", word);

    return 0;

}

Output:

Enter a word

prapti

The reversed word is itparp

3. strcat()

This string function is used to join two string together.

For example:

#include<stdio.h>

#include<string.h>

int main()

{

    char word1[25], word2[25];

    printf("enter two words\n");

    scanf("%s %s", word1, word2);

    strcat(word1, word2);

    printf("The combined word is %s", word1);

    return 0;

}

Output:

Enter two words

gita sita

The combined word is gitasita

4. strupr()

The string function is used to convert lower case into upper case letter.

For example:

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

    char word[25];

    clrscr();

    printf("enter a word\n");

    scanf("%s", word);

    strupr(word);

    printf("The upper case letter is %s", word);

    getch();

}

Output:

Enter a word

prapti

The upper case letter is PRAPTI

5. strlwr()

The string function is used to convert upper case into lower case letter.

For example:

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

    char word[25];

    clrscr();

    printf("enter a word\n");

    scanf("%s", word);

    strlwr(word);

    printf("The lower case letter is %s", word);

    getch();

}

Output:

Enter a word

PRAPTI

The lower case letter is prapti

6. strcmp()

This string function is used to compare two string.

For example:

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

    char word1[25], word2[25];

    clrscr();

    printf("enter two words\n");

    scanf("%s %s", word1, word2);

    if (strcmp(word1, word2) == 0)

    {

        printf("Both string are same");

    }

    else

    {

        printf("Both string are not same");

    }

    getch();

}

Output:

Enter two words

prapti, prapti

Both string are same

7. strcpy()

This string function is used to copy string from one string variable to another variable.

For example:

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

    char word1[25], word2[25];

    clrscr();

    printf("enter a word\n");

    scanf("%s", word2);

    strcpy(word1, word2);

    printf("The copied word is %s", word1);

    getch();

}

Output:

enter a word

prapti

The copied word is prapti

Practice Questions

Q. WAP to check whether the given word is palindrome or not.

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

    char word1[25], word2[25];

    clrscr();

    printf("enter a word\n");

    scanf("%s", word1);

    strcpy(word2, word1);

    strrev(word1);

    if (strcmp(word1, word2) == 0)

    {

        printf("palindrome");

    }

    else

    {

        printf("Not palindrome");

    }

    getch();

}

Output:

Enter a word

prapti

Not palindrome