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#include stdio.h

int main() {
    int a1 = 3; 
    int d = 4; 
    int n = 1; 

    int an = a1 + (n-1) * d; 
    
    printf("The first term of the arithmetic progression is %d\n", a1);
    printf("The common difference is %d\n", d);
    printf("The number of terms is %d\n", n);
    printf("The nth term of the arithmetic progression is %d\n", an);
    
    return 0;
}

#include stdio.h
int x = 0;
int f()
{
    if (x == 0)
        return x + 1;
    else
        return x - 1;
}
int g()
{
    return x++;
}
int main()
{
    int i = (f() + g()) | g(); //bitwise or
    int j = g() | (f() + g()); //bitwise or
}

class output 
   {
        public static void main(String args[]) 
        {
            double a, b,c;
            a = 3.0/0;
            b = 0/4.0;
            c=0/0.0;
            System.out.println(a);
            System.out.println(b);
            System.out.println(c);
        } 
    }

public class CaesarCipher {
    public static String encrypt(String plaintext, int shift) {
        StringBuilder ciphertext = new StringBuilder();
        for (int i = 0; i  plaintext.length(); i++) {
            char c = plaintext.charAt(i);
            if (Character.isLetter(c)) {
                c = (char) (((c - 'a' + shift) % 26) + 'a');
            }
            ciphertext.append(c);
        }
        return ciphertext.toString();
    }
    public static String decrypt(String ciphertext, int shift) {
        StringBuilder plaintext = new StringBuilder();
        for (int i = 0; i  ciphertext.length(); i++) {
            char c = ciphertext.charAt(i);
            if (Character.isLetter(c)) {
                c = (char) (((c - 'a' - shift + 26) % 26) + 'a');
            }
            plaintext.append(c);
        }
        return plaintext.toString();
    }
    public static void main(String[] args) {
        String plaintext = "hello world";
        int shift = 3;
        String ciphertext = encrypt(plaintext, shift);
        System.out.println("Ciphertext: " + ciphertext);
        String decryptedText = decrypt(ciphertext, shift);
        System.out.println("Decrypted text: " + decryptedText);
    }
}

a1 = 3
d = 3
n = 3

Sn = (n/2) * (2*a1 + (n-1)*d)

print("The sum of the first", n, "terms of the arithmetic sequence with a1 =", a1, "and d =", d, "is:", Sn)