Sum: Individual Exercise

Write a program that prints out the sum of a given sequence of integers. The program should ask the user for an ending point for the sequence, and then add all the integers between 0 and the ending point and print the result.

Examples

Enter a top number: 10
Result: 55

This is because 1+2+3+4+5+6+7+8+9+10=55.

Enter a top number: 5
Result: 15

This is because 1+2+3+4+5=15.

Part 1 - User input

1. Print a message asking the user to enter an integer for the top number
2. Get input from the user using Console.ReadLine
3. Define a new variable to store the number the user enters (topNumber)
4. Convert the string input into an integer using Convert.ToInt32

Part 2 - for loop set up

1. Build out the for loop structure:
   • for keyword
   • Parentheses (())
   • Within the parentheses: two semi-colons (;)
   • After the parentheses: curly brackets ({})
2. Fill in the for loop initializer, conditional, and modifier:
   • Declare the i variable, set it equal to 1
   • Check that i is less than or equal to the topNumber variable the user entered
   • Increment the i variable by 1

Part 3 - Finishing up

1. Above the for loop, create a variable to keep track of the sum (name it sum)
   • Set its initial value to 0
2. Within the body of the for loop, update the value of sum
   • Add the current value of i to the current value of sum
3. Beneath the for loop, print out the resulting sum

(BONUS) Part 4 - User-defined starting point

Instead of using the 1 as the first value in the sequence, ask the user for a value. Use that value in the for loop so that it only sums the integers between that value and the topNumber value.

Examples

Enter a top number: 10
Enter a bottom number: 8
Result: 27

This is because 8+9+10=27.

Enter a top number: 5
Enter a bottom number: 2
Result: 14

This is because 2+3+4+5=14.