#include <iostream> using namespace std; int main() { for(int i=3;i!=0; i--) { count<<i--<<" "; } }

Explanation of Code Execution:

  1. The code starts by including the iostream library, which provides the necessary functions for input and output operations in C++.

  2. The line "using namespace std;" is used to avoid typing "std::" before every function call from the standard library, making the code more concise.

  3. The main function is the entry point of the program and is where the execution starts. It has a return type of "int", indicating that it should return an integer value.

  4. The for loop is initialized with the variable i set to 3, the condition i!=0, and the decrement expression i--. This loop will execute as long as the condition i!=0 is true.

  5. Inside the loop, the statement "count<<i--<<" "; " is executed. This statement first prints the current value of i, then decrements i by 1, and finally prints a space character.

  6. After each iteration of the loop, the value of i is decremented by 1.

  7. Once the value of i becomes 0, the condition i!=0 is no longer true, and the loop terminates.

  8. The program then reaches the end of the main function and returns 0, indicating successful execution.

Output Explanation:

The code will output the numbers 3, 2, and 1 separated by a space, like this: "3 2 1 ". The space character is printed after each number using the "<<" operator. The numbers are printed in descending order because the loop starts with i=3 and decrements i by 1 after each iteration. The loop terminates when i becomes 0, and the program exits after printing the numbers.