Practical 10 PPS

 Write a program that reads a string and counts occurrences of a given character.

#include <string.h>

int main()

{

    char s[1000], c;

    int i, count = 0;

    printf("Enter  the string : ");

    gets(s);

    printf("Enter character to be searched: ");

    c = getchar();

    for (i = 0; s[i]; i++)

    {

        if (s[i] == c)

        {

            count++;

        }

    }

    printf("character '%c' occurs %d times \n ", c, count);

    return 0;

}

Write a program convert character into Toggle character.

/*C program to toggle each character in a string.*/

#include <stdio.h>

int main()

{

    char str[100];

    int counter;

    printf("Enter a string: ");

    gets(str);

    // toggle each string characters

    for (counter = 0; str[counter] != NULL; counter++)

    {

        if (str[counter] >= 'A' && str[counter] <= 'Z')

            str[counter] = str[counter] + 32; // convert into lower case

        else if (str[counter] >= 'a' && str[counter] <= 'z')

            str[counter] = str[counter] - 32; // convert into upper case

    }

    printf("String after toggle each characters: %s", str);

    return 0;

}

Write a program that checks whether the string is palindrome or not using string library function.

#include <stdio.h>

#include <string.h>

int main()

{

    char s[1000];

    int i, n, c = 0;

    printf("Enter  the string : ");

    gets(s);

    n = strlen(s);

    for (i = 0; i < n / 2; i++)

    {

        if (s[i] == s[n - i - 1])

            c++;

    }

    if (c == i)

        printf("string is palindrome");

    else

        printf("string is not palindrome");

    return 0;

}