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SumAndAverage.java
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184 lines (167 loc) · 5.41 KB
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/**
* Write a program 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:
* <code>
* The sum is 5050
* The average is 50.5
* </code>
*/
package javaexercises.flowcontrol;
/**
*
* @author User
*/
public class SumAndAverage {
/**
*
* @param args
*/
public static void main(String[] args)
{
int upperBoundNumber = 100;
if (upperBoundNumber <= 0) {
System.out.println("Error: upperbound less than 0!");
return;
}
SumAndAverage aSumAndAverage = new SumAndAverage();
aSumAndAverage.printSumNumbersUsingForLoop(upperBoundNumber);
aSumAndAverage.printSumNumbersUsingDoWhileLoop(upperBoundNumber);
aSumAndAverage.printSumNumbersUsingWhileDoLoop(upperBoundNumber);
aSumAndAverage.printSumNumbersFromRange(111, 8899);
aSumAndAverage.printSumOddNumbers(1, 100);
aSumAndAverage.printSumNumbersDivisibleBySeven(1, 100);
aSumAndAverage.printSumSquares(1, 100);
}
/**
* Sum the numbers use a \"for\" loop.
* @param number
* @return
*/
private void printSumNumbersUsingForLoop(int number)
{
long sum = 0L;
for(int i = 1; i <= number; i++) {
sum += i;
}
System.out.println("Sum the "+number+" numbers use a \"for\" loop.");
System.out.println("The sum is " + sum);
System.out.println("The average is "+ ((double) sum / number));
}
/**
* Sum the numbers use a "do-while" loop instead of \"for\" loop.
* @param number
* @return
*/
private void printSumNumbersUsingDoWhileLoop(int number)
{
long sum = 0L;
int i = 1;
do {
sum += i;
i++;
} while (i <= number);
System.out.println("Sum the "+number+" numbers use a \"do-while\" loop.");
System.out.println("The sum is " + sum);
System.out.println("The average is "+ ((double) sum / number));
}
/**
* Sum the numbers use a "while-do" loop instead of \"for\" loop.
*
* @param number
* @return
*/
private void printSumNumbersUsingWhileDoLoop(int number)
{
long sum = 0L;
int i = 1;
while (i <= number) {
sum += i;
i++;
}
System.out.println("Sum the "+number+" numbers use a \"while-do\" loop.");
System.out.println("The sum is " + sum);
System.out.println("The average is "+ ((double) sum / number));
}
/**
* Sum the numbers from range.
*
* @param lowerNumber
* @param upperNumber
* @return
*/
private void printSumNumbersFromRange(int lowerNumber, int upperNumber)
{
long count = 0L;
long sum = 0L;
for (int i = lowerNumber; i <= upperNumber; i++) {
sum += i;
count++;
}
System.out.println("4. Sum numbers from "+lowerNumber+" to "+upperNumber+", and compute the average.");
System.out.println("The sum is " + sum);
System.out.printf ("The average is %.2f", ((double) sum / count));
System.out.println();
}
/**
* Sum only the odd numbers from range, and compute the average.
*
* @param lowerNumber
* @param upperNumber
*/
private void printSumOddNumbers(int lowerNumber, int upperNumber)
{
long count = 0L;
long sum = 0L;
for (int i = lowerNumber; i <= upperNumber; i++) {
if (i % 2 != 0) {
continue;
}
sum += i;
count++;
}
System.out.println("5. Sum only the odd numbers from "+lowerNumber+" to "+upperNumber+", and compute the average.");
System.out.println("The sum is " + sum);
System.out.printf ("The average is %.2f", ((double) sum / count));
System.out.println();
}
/**
* Sum numbers from range that is divisible by 7, and compute the average.
*
* @param lowerNumber
* @param upperNumber
*/
private void printSumNumbersDivisibleBySeven(int lowerNumber, int upperNumber)
{
long count = 0L;
long sum = 0L;
for (int i = lowerNumber; i <= upperNumber; i++) {
if (i % 7 != 0) {
continue;
}
sum += i;
count++;
}
System.out.println("6. Sum numbers from "+lowerNumber+" to "+upperNumber+" that is divisible by 7, and compute the average.");
System.out.println("The sum is " + sum);
System.out.printf ("The average is %.2f", ((double) sum / count));
System.out.println();
}
/**
* Find out the "sum of the squares" of all the numbers from 1 to 100,
* i.e. 1*1 + 2*2 + 3*3 + ... + 100*100.
*/
private void printSumSquares(int lowerNumber, int upperNumber)
{
long count = 0L;
long sum = 0L;
for (int i = lowerNumber; i <= upperNumber; i++) {
sum += i*i;
System.out.println(i*i);
count++;
}
System.out.println("7. Sum of the squares from "+lowerNumber+" to "+upperNumber+".");
System.out.println("The sum is " + sum);
System.out.printf ("The average is %.2f", ((double) sum / count));
System.out.println();
}
}