Exercise SumAndAverage (Loop)

Write a program called SumAndAverage to produce the sum of 1, 2, 3, ..., to an upperbound (e.g., 100). Also compute and display the average. The output shall look like:
The sum is 5050
The average is 50.5
For Hints Visti Hints on Exercise SumAndAverage (Loop)


TRY:

1. Modify the program to use a "while-do" loop instead of "for" loop.

int number = lowerbound;
int sum = 0;
while (number <= upperbound) {
   sum += number;
   ++number;
}

2. Modify the program to use a "do-while" loop.

int number = lowerbound;
int sum = 0;
do {
   sum += number;
   ++number;
} while (number <= upperbound);

3. What is the difference between "for" and "while-do" loops? What is the difference between "while-do" and "do-while" loops?
4. Modify the program to sum from 111 to 8899, and compute the average. Introduce an int variable called count to count the numbers in the specified range.

int count = 0;   // count the number within the range, init to 0
for (...; ...; ...) {
   ......
   ++count;
}

5. Modify the program to sum only the odd numbers from 1 to 100, and compute the average. (Hint: n is an odd number if n % 2 is not 0.)
6. Modify the program to sum those numbers from 1 to 100 that is divisible by 7, and compute the average.
7. Modify the program to find the "sum of the squares" of all the numbers from 1 to 100, i.e. 1*1 + 2*2 + 3*3 + ... + 100*100.

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