Question

What goes in the blanks to make this for loop sum the values 1..n?

int n, x = 0;
cout << "Enter a positive number: ";
cin >> n;
for (int count = 1; __________; count++)
_______________
cout << x << endl;

Answer 1

To sum the values from 1 to n in the given for loop, fill the first blank with 'count <= n' to ensure the loop continues until count exceeds n, and the second blank with 'x += count' to sum up the count values.

Step-by-step explanation:

To make the for loop sum the values from 1 to n, you need to specify the loop to continue running as long as count is less than or equal to n, and to increment the sum variable x by adding the value of count at each iteration. Therefore, the blanks would be filled as follows:

for (int count = 1; count <= n; count++) x += count;

This loop will execute n times, with count taking on the values from 1 to n, during each iteration x is increased by the value of count. Eventually, x would represent the sum of all numbers from 1 to n.