Difference between spoofing and sniffing

What will be the output in C and Java code?

(i) C program:

#include<stdio.h>
int main(){
    int a[] = {5,3,4,2,1};
    int i;
    for(i=0; i<10; i++)
        printf("%d\n", a[i]);
}

(ii) Java program:

public class MyFirst {
    public static void main(String[] args) {
        MyFirst obj = new MyFirst(n);
    }

    static int a = 10;
    static int n;
    int b = 5;
    int c;

    public MyFirst(int m) {
        System.out.println(a + ", " + b + ", " + c + ", " + n + ", " + m);
    }

    {
        b = 30;
        n = 20;
    }

    static {
        a = 60;
    }
}

X is an integer stream of N numbers. You have to select 2 data P and Q such that A <= (P+Q) <= B. Write an algorithm / pseudo code/ C program how many ways you can select P & Q. The time complexity must be n log n.

How to Determine the weighted graph has negative cycle?

Write a code in C/C++ that will output the 2nd largest number. (If N>=1)

What is the full meaning of SQL? List of the aggregate function. Write SQL Query of a table and its output.

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Linked list, doubly linked list and circular linked list explains with diagram.

Write down the functionality of OSI model.

Draw ER Diagram (Not Fully Collected)