Assignment 9 PPS

  Assignment 9 PPS

Problem 1: Write a C program to read two numbers from user and add them using pointers.

sol.    

#include<stdio.h>

// Function for add two numbers using pointers

void addNumbers(int *num1, int *num2, int *sum) {

    *sum = *num1 + *num2;

}

int main() {

    int num1, num2, sum;

    printf("Enter the first number: "); 

    scanf("%d", &num1);

    printf("Enter the second number: "); 

    scanf("%d", &num2);

    // Calling the sum function

    addNumbers(&num1, &num2, &sum); 

    printf("The sum of %d and %d is %d\n", num1, num2, sum);

    return 0;

}

Problem 2: Write a C program to swap two elements using the concept of pointers. Create a function swap and use call by reference.

sol. 

#include<stdio.h>

// Function for swapping

void swap(int *a, int *b) {

    int temp = *a;

    *a = *b;

    *b = temp;

}

int main() {

    int num1, num2;

    printf("Enter the first number: "); 

    scanf("%d", &num1);

    printf("Enter the second number: "); 

    scanf("%d", &num2);

    //before swapping

    printf("Before swapping: num1 = %d, num2 = %d\n", num1, num2); 

    swap(&num1, &num2); // Calling swap function

    //After swapping

    printf("After swapping: num1 = %d, num2 = %d\n", num1, num2); 

    return 0;

}

Problem 3: Write a C program to input elements in an array and print array using pointers.

sol.

#include<stdio.h>

// Function for inputing elements into an array

void inputArray(int *arr, int size) {

int i;

    printf("Enter %d elements:\n", size);

    for (i = 0; i < size; i++) {

        scanf("%d", arr + i); // Using pointer arithmetic to access array elements

    }

}

// Function for printing elements of an array

void printArray(int *arr, int size) {

int i;

    printf("The array elements are:\n");

    for (i = 0; i < size; i++) {

        printf("%d ", *(arr + i)); // Using pointer arithmetic to access array elements

    }

    printf("\n");

}

int main() {

    int size;

    printf("Enter the size of the array: "); 

    scanf("%d", &size);

    int arr[size]; // Declaring array

    inputArray(arr, size); //Calling function for Inputing elements

    printArray(arr, size); //Calling function for Print elements of the array

    return 0;

}

Problem 4: Write a C program to search an element in array using pointers.

sol.

#include<stdio.h>

int searchElement(int *arr, int size, int key) {

int i;

    for (i = 0; i < size; i++) {

        if (*(arr + i) == key) 

            return i;

    }

    return -1;

}

int main() {

    int size, key,i;

    printf("Enter the size of the array: "); 

    scanf("%d", &size);

    

    int arr[size];

    printf("Enter %d elements:\n", size);

    for (i = 0; i < size; i++)

        scanf("%d", &arr[i]);

    printf("Enter the element to search: "); scanf("%d", &key);

    int index = searchElement(arr, size, key);

    if (index != -1)

        printf("Element %d found at index %d\n", key, index);

    else

        printf("Element %d not found in the array\n", key);

    return 0;

}

Problem 5: Write a C program to concatenate two strings in a single string using pointers.

sol.

#include<stdio.h>

#include<string.h>

// Function to concatenate two strings

void concatenateStrings(char *str1, char *str2, char *result) {

    while (*str1 != '\0') { // Copying the first string into result

        *result = *str1;

        result++;

        str1++;

    }

    while (*str2 != '\0') { // Copying the second string into result

        *result = *str2;

        result++;

        str2++;

    }

  *result = '\0'; // Terminate the concatenated string

}

int main() {

    char str1[100], str2[100], result[200];

    puts("Enter the first string: "); gets(str1);

    puts("Enter the second string: "); gets(str2);

    concatenateStrings(str1, str2, result); // Calling the concatenateStrings function

    printf("Concatenated string: %s\n", result); // Printing the concatenated string

    return 0;

}

Problem 6: Write a C program to find reverse of a string using pointers.

sol.    

#include<stdio.h>

#include<string.h>

// Function to reverse a string using pointers

void reverseString(char *str) {

    int length = strlen(str);              // Finding the length of the string

    char *start = str;                      // Pointer to the start of the string

    char *end = str + length - 1;   // Pointer to the end of the string

// Swap characters from start to end

    while (start < end) {    

        // Swap characters

        char temp = *start;

        *start = *end;

        *end = temp;

        // Move pointers

        start++;

        end--;

    }

}

int main() {

    char str[100];

    puts("Enter a string: "); 

    gets(str);

    reverseString(str); // Calling the reverseString function

    printf("Reversed string: %s\n", str); // Printing the reversed string

    return 0;

}