Sum of numbers from 1 to user-defined limit

AkaruiKuraku

May 13th, 2025 (edited)

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//this thing has two version, the other one is at the bottom
import java.util.Scanner;
public class AkaruiKuraku {
public static void main(String []args) {
Scanner choice = new Scanner(System.in);
int what;
int number;
do {
System.out.println("\nSum of numbers from 1 to a user defined limit");
System.out.println("\nChoose what method to use:");
System.out.println("1 - For loop");
System.out.println("2 - While loop");
System.out.println("3 - Do loop");
System.out.println("\n4 - Exit\n");
System.out.print("Input: ");
what = checkInputType(choice);
choice.nextLine();
if (what < 5 && what >= 1 && what != 4) {
System.out.print("\nEnter number limit: ");
number = checkInputType(choice);
choice.nextLine();
} else if (what == 4) {
System.out.print("...");
break;
} else {
System.out.println("\nInvalid, try again.\n");
continue;
}
int result;
switch (what) {
case 1:
result = limitCalcMethod1(number);
System.out.println("\nResult: " + result);
break;
case 2:
result = limitCalcMethod2(number);
System.out.println("\nResult: " + result);
break;
case 3:
result = limitCalcMethod3(number);
System.out.println("\nResult: " + result);
break;
}
} while (what != 4);
choice.close();
}
static int limitCalcMethod1(int number) {
int i;
int con = 0;
for (i = 1; i <= number; i++) {
con += i;
}
return con;
}
static int limitCalcMethod2(int number) {
int i = 1;
int con = 0;
while (i <= number) {
con += i;
i++;
}
return con;
}
static int limitCalcMethod3(int number) {
int i = 1;
int con = 0;
do {
con += i;
i++;
} while (i <= number);
return con;
}
static int checkInputType(Scanner choice) {
while (true) {
if (choice.hasNextInt()) {
return choice.nextInt();
}
else {
System.out.println("Invalid type, please try again.");
choice.next();
}
}
}
}
//optimized ver. below
import java.util.Scanner;
public class AkaruiKuraku {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int choice;
int number;
while (true) {
printMenu();
choice = getValidInput(scanner);
if (choice == 4) {
System.out.println("Exiting...");
break;
}
if (choice >= 1 && choice <= 3) {
System.out.print("\nEnter number limit: ");
number = getValidInput(scanner);
int result;
result = calculateSum(choice, number);
System.out.println("\nResult: " + result);
} else {
System.out.println("\nInvalid, try again.\n");
}
}
scanner.close();
}
static void printMenu() {
System.out.println("\nSum of numbers from 1 to a user defined limit");
System.out.println("\nChoose what method to use:");
System.out.println("1 - For loop");
System.out.println("2 - While loop");
System.out.println("3 - Do loop");
System.out.println("\n4 - Exit\n");
System.out.print("Input: ");
}
static int calculateSum(int method, int number) {
int sum = 0;
switch (method) {
case 1:
for (int i = 1; i <= number; i++) {
sum += i;
}
break;
case 2:
int i = 1;
while (i <= number) {
sum += i;
i++;
}
break;
case 3:
i = 1;
do {
sum += i;
i++;
} while (i <= number);
break;
}
return sum;
}
static int getValidInput(Scanner scanner) {
while (!scanner.hasNextInt()) {
System.out.println("Invalid type, please try again.");
scanner.next();
}
return scanner.nextInt();
}
}

Tags: Java Addition loops Iteration

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