C PROGRAMMING

cpp
#include <iostream>

using namespace std;

int main() {
    int num,res=1;
    cout << "Enter a positive number:" << endl;
    cin >> num;
    if(num < 0){
        cout << "You entered a negative number" << endl;
    }
    else if(num == 0){
        cout << "0! = " << "1";
    }
    else{
        for(int i = 1;i <= num;i++){
            res = res * i;
        }
        cout << "Factorial of " << num << " is "<<res;
    }

    return 0;
}

#include <iostream>

int main() {
    int a=1;
    int b=2;
    int temp;
    std::cout << "Before Swapping:\n";
    std::cout << "a=" << a <<",b=" << b <<"\n";
    temp = a;
    a=b;
    b=temp;
    std::cout << "After Swapping:\n";
    std::cout << "a=" << a <<",b=" << b <<"\n";
    return 0;
}

#include <iostream>

int main() {
    std::cout << "Hello World";
    return 0;
}

#include <stdio.h>

int main() {
    int x = 10;
    int *ptr = &x;
    *ptr = 20;
    printf("%d\n", x);
    return 0;
}

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