Assignment4_1

User Defined Functions [SET – 1]

#include <iostream>
using namespace std;

int sum(int a, int b) {
    return a + b;
}

int main() {
    int num1, num2;
    cout << "Enter two numbers: ";
    cin >> num1 >> num2;

    int result = sum(num1, num2);
    cout << "Sum: " << result;

    return 0;
}

#include <iostream>
using namespace std;

int factorial(int n) {
    if (n == 0 || n == 1)
        return 1;
    else
        return n * factorial(n - 1);
}

int main() {
    int num;
    cout << "Enter a number: ";
    cin >> num;

    int result = factorial(num);
    cout << "Factorial: " << result;

    return 0;
}

#include <iostream>
using namespace std;

bool isPrime(int n) {
    if (n < 2) return false;
    for (int i = 2; i * i <= n; i++) {
        if (n % i == 0) return false;
    }
    return true;
}

void printPrimes(int start, int end) {
    for (int i = start; i <= end; i++) {
        if (isPrime(i)) {
            cout << i << " ";
        }
    }
}

int main() {
    int start, end;
    cout << "Enter two numbers: ";
    cin >> start >> end;

    cout << "Prime numbers between " << start << " and " << end << ": ";
    printPrimes(start, end);

    return 0;
}

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

double power(double n, int p = 2) {
    return pow(n, p);
}

int main() {
    double num;
    int exponent;
    cout << "Enter a number: ";
    cin >> num;

    cout << "Enter an exponent (or press enter for default): ";
    cin >> exponent;

    cout << "Result: " << power(num, exponent);

    return 0;
}

#include <iostream>
using namespace std;

void zero_small(int &a, int &b) {
    if (a < b) {
        a = 0;
    } else {
        b = 0;
    }
}

int main() {
    int num1, num2;
    cout << "Enter two numbers: ";
    cin >> num1 >> num2;

    zero_small(num1, num2);

    cout << "After zero_small(): " << num1 << " " << num2;

    return 0;
}

#include <iostream.h>
void X(int &A, int &B) {
    A = A + B;
    B = A - B;
    A = A - B;
}

void main() {
    int a = 4, b = 18;
    X(a, b);
    cout << a << "," << b;
}

// Output: 18,4

#include <iostream.h>
void X(int A, int &B) {
    A = A + B;
    B = A - B;
    A = A - B;
}

void main() {
    int a = 4, b = 18;
    X(a, b);
    cout << a << "," << b;
}

// Output: 4,4

#include <iostream.h>
void Execute(int &B, int C = 100) {
    int TEMP = B + C;
    B += TEMP;
    if (C == 100)
        cout << TEMP << " " << B << " " << C << endl;
}

void main() {
    int M = 90, N = 10;
    Execute(M);
    cout << M << " " << N << endl;
    Execute(M, N);
    cout << M << " " << N << endl;
}

// Output:
// 190 280 100
// 280 10
// 290 10

#include <iostream.h>
int global = 10;
void func(int &x, int y) {
    x = x - y;
    y = x * 10;
    cout << x << " " << y << '\n';
}

void main() {
    int global = 7;
    func(::global, global);
    cout << global << "," << ::global << '\n';
    func(global, ::global);
    cout << global << "," << ::global << '\n';
}

// Output:
// 3 30
// 7,3
// 4 40
// 4,3

#include <iostream.h>
static int i = 100;

void abc() {
    static int i = 8;
    cout << "first=" << i++;
}

int main() {
    static int i = 2;
    abc();
    cout << "second=" << i << endl;
    abc();
}

// Output:
// first=8second=2
// first=9

#include <iostream.h>
int func(int &x, int y = 10) {
    if (x % y == 0)
        return ++x;
    else
        return y--;
}

void main() {
    int p = 20, q = 23;
    q = func(p, q);
    cout << p << " " << q << endl;
    p = func(q);
    cout << p << " " << q << endl;
}

// Output:
// 20 22
// 23 22