Food blog

 

Task 1: Array me 5 integers input using pointer offset notation

#include <iostream>
using namespace std;

int main() {
    int arr[5];
    int *p = arr;

    cout << "Enter 5 integers:\n";
    for (int i = 0; i < 5; i++) {
        cin >> *(p + i);   // pointer offset notation
    }

    cout << "You entered:\n";
    for (int i = 0; i < 5; i++) {
        cout << *(p + i) << " ";
    }
    return 0;
}

---

Task 2: Sort array of 10 integers in ascending order (using function)

#include <iostream>
using namespace std;

void sortArray(int *arr, int size) {
    for (int i = 0; i < size - 1; i++) {
        for (int j = i + 1; j < size; j++) {
            if (*(arr + i) > *(arr + j)) {
                int temp = *(arr + i);
                *(arr + i) = *(arr + j);
                *(arr + j) = temp;
            }
        }
    }
}

int main() {
    int arr[10];
    cout << "Enter 10 integers:\n";
    for (int i = 0; i < 10; i++)
        cin >> arr[i];

    sortArray(arr, 10);

    cout << "Sorted array:\n";
    for (int i = 0; i < 10; i++)
        cout << arr[i] << " ";

    return 0;
}

---

Task 3: Find maximum of two numbers using pointer

#include <iostream>
using namespace std;

int main() {
    int a, b;
    int *p1, *p2;

    cout << "Input first number: ";
    cin >> a;
    cout << "Input second number: ";
    cin >> b;

    p1 = &a;
    p2 = &b;

    if (*p1 > *p2)
        cout << *p1 << " is the maximum number";
    else
        cout << *p2 << " is the maximum number";

    return 0;
}

---

Task 4: Print all permutations of a string using pointers

#include <iostream>
#include <cstring>
using namespace std;

void swap(char *x, char *y) {
    char temp = *x;
    *x = *y;
    *y = temp;
}

void permute(char *str, int l, int r) {
    if (l == r)
        cout << str << " ";
    else {
        for (int i = l; i <= r; i++) {
            swap((str + l), (str + i));
            permute(str, l + 1, r);
            swap((str + l), (str + i));
        }
    }
}

int main() {
    char str[] = "abcd";
    int n = strlen(str);
    cout << "The permutations of the string are:\n";
    permute(str, 0, n - 1);
    return 0;
}

---

Task 5: Swap elements using call by reference

#include <iostream>
using namespace std;

void swapValues(int &a, int &b, int &c) {
    int temp = a;
    a = c;
    c = b;
    b = temp;
}

int main() {
    int a, b, c;

    cout << "Input value of 1st element: ";
    cin >> a;
    cout << "Input value of 2nd element: ";
    cin >> b;
    cout << "Input value of 3rd element: ";
    cin >> c;

    cout << "\nThe value before swapping are:\n";
    cout << "element 1 = " << a << endl;
    cout << "element 2 = " << b << endl;
    cout << "element 3 = " << c << endl;

    swapValues(a, b, c);

    cout << "\nThe value after swapping are:\n";
    cout << "element 1 = " << a << endl;
    cout << "element 2 = " << b << endl;
    cout << "element 3 = " << c << endl;

    return 0;
}

---

Task 6: Convert kilogram to grams using pointers

#include <iostream>
using namespace std;

void kgToGram(float *kg, float *gram) {
    *gram = (*kg) * 1000;
}

int main() {
    float kg, gram;
    cout << "Enter kilograms: ";
    cin >> kg;

    kgToGram(&kg, &gram);

    cout << "Grams = " << gram;
    return 0;
}

---

Task 7: Print string character by character using pointer

#include <iostream>
using namespace std;

int main() {
    char str[50];
    cout << "Enter a string: ";
    cin.getline(str, 50);

    char *p = str;
    while (*p != '\0') {
        cout << *p << endl;
        p++;
    }
    return 0;
}

---

Task 8: Find length of string using pointers

#include <iostream>
using namespace std;

int main() {
    char str[50];
    cout << "Enter a string: ";
    cin.getline(str, 50);

    char *p = str;
    int length = 0;

    while (*p != '\0') {
        length++;
        p++;
    }

    cout << "Length of string = " << length;
    return 0;
}