Answer:
C# code:
#include <stdio.h>
// start main function
int main()
{
// declare the required variables
int userNum = 0;
int i = 0;
// set userNum to 3
userNum = 3;
// print the 'Ready!'
printf("Ready!");
// print the new line
printf("\n");
// use the for-loop to print userNum ... 2 1
for (i = userNum; i >= 1; i--)
{
// print current value of i
printf("%d", i);
// print the new line
printf("\n");
} // end for-loop
// print the 'Blastoff!'
printf("Blastoff!");
// print the new line
printf("\n");
// return from the program
return 0;
} // end of main function
Explanation: