Write a program segment that computes XXXXXXXXXXn-1)+n, where n is a data value. Follow the loop body with an if statement that compares this value to (n * (n + 1)) / 2 and displays a message that...

Write a program segment that computes 1+2+3+...+(n-1)+n, where n is a data value. Follow the loop body with an if statement that compares this value to (n * (n + 1)) / 2 and displays a message that indicates whether the values are the same or different.