Example1 : Write C# program using method to exchange two number (Swap)?
Sol//
using System;
class Program
{
static void Main()
{
int num1 = 5;
int num2 = 10;
Console.WriteLine($"Before swapping: num1 = {num1}, num2 = {num2}");
// Call the Swap method to exchange the values of num1 and num2
Swap(ref num1, ref num2);
Console.WriteLine($"After swapping: num1 = {num1}, num2 = {num2}");
}
// Method to swap two numbers
static void Swap(ref int a, ref int b)
{
int temp = a;
a = b;
b = temp;
}
}
Ex2: Write C# Program using methods to read three integer number and find the value of y Where:
Y= x1! + x2! + x3!
Sol//
using System;
class Program
{
static void Main()
{
Console.WriteLine("Enter three integer numbers:");
int x1 = int.Parse(Console.ReadLine());
int x2 = int.Parse(Console.ReadLine());
int x3 = int.Parse(Console.ReadLine());
long y = Factorial(x1) + Factorial(x2) + Factorial(x3);
Console.WriteLine($"Y = {y}");
}
// Method to calculate factorial of a number
static long Factorial(int num)
{
if (num == 0)
return 1;
long result = 1;
for (int i = 1; i <= num; i++)
{
result *= i;
}
return result;
}
}
Ex3: Write C# Program using methods to read four integer number and find the value of sum Where: Sum= x1+x2+x3+x4
Sol//
using System;
class Program
{
static void Main()
{
Console.WriteLine("Enter four integer numbers:");
int x1 = int.Parse(Console.ReadLine());
int x2 = int.Parse(Console.ReadLine());
int x3 = int.Parse(Console.ReadLine());
int x4 = int.Parse(Console.ReadLine());
int sum = Sum(x1, x2, x3, x4);
Console.WriteLine($"Sum = {sum}");
}
// Method to calculate sum of four numbers
static int Sum(int num1, int num2, int num3, int num4)
{
return num1 + num2 + num3 + num4;
}
}
Example4/ Write C# program using methods to find the average of set numbers ended by number equal first number?
Sol//
using System;
class Program
{
static void Main()
{
Console.WriteLine("Enter a set of numbers (terminate with the first number entered):");
// Read the first number
double firstNumber = double.Parse(Console.ReadLine());
// Calculate the average of the set of numbers
double average = CalculateAverage(firstNumber);
Console.WriteLine($"The average of the set of numbers is: {average}");
}
// Method to calculate the average of a set of numbers
static double CalculateAverage(double firstNumber)
{
double sum = firstNumber;
int count = 1;
double currentNumber;
do
{
currentNumber = double.Parse(Console.ReadLine());
sum += currentNumber;
count++;
} while (currentNumber != firstNumber);
return sum / count;
}
}
Example5: Write C# program to create an array (A) of 10 integer numbers and an array(B) of 10 integer numbers and find the summation of array A and array B in an array C and print array A, B and C; using methods?
Sol//
using System;
class Program
{
static void Main()
{
int[] arrayA = new int[10];
int[] arrayB = new int[10];
// Populate arrayA
Console.WriteLine("Enter 10 integer numbers for array A:");
InputArrayValues(arrayA);
// Populate arrayB
Console.WriteLine("Enter 10 integer numbers for array B:");
InputArrayValues(arrayB);
// Summation of arrayA and arrayB
int[] arrayC = SumArrays(arrayA, arrayB);
// Print arrays
Console.WriteLine("Array A:");
PrintArray(arrayA);
Console.WriteLine("Array B:");
PrintArray(arrayB);
Console.WriteLine("Array C (Sum of A and B):");
PrintArray(arrayC);
}
// Method to input values into an array
static void InputArrayValues(int[] array)
{
for (int i = 0; i < array.Length; i++)
{
Console.Write($"Enter value {i + 1}: ");
array[i] = int.Parse(Console.ReadLine());
}
}
// Method to sum two arrays
static int[] SumArrays(int[] arrayA, int[] arrayB)
{
int[] result = new int[arrayA.Length];
for (int i = 0; i < arrayA.Length; i++)
{
result[i] = arrayA[i] + arrayB[i];
}
return result;
}
// Method to print an array
static void PrintArray(int[] array)
{
foreach (int num in array)
{
Console.Write(num + " ");
}
Console.WriteLine();
}
}
Example6: Write a C# program using methods to create array named table of n integer numbers, and find the following using methods:
1- the count the positive even numbers and count positive odd numbers .
2- increment each number in odd position by 10 and each number in even position
by 5.
3- Print array .
Sol//
using System;
class Program
{
static void Main()
{
Console.WriteLine("Enter the size of the array:");
int n = int.Parse(Console.ReadLine());
int[] table = new int[n];
// Populate the array
PopulateArray(table);
// Count positive even and odd numbers
int countPositiveEven = CountPositiveEven(table);
int countPositiveOdd = CountPositiveOdd(table);
Console.WriteLine($"Count of positive even numbers: {countPositiveEven}");
Console.WriteLine($"Count of positive odd numbers: {countPositiveOdd}");
// Increment numbers in odd and even positions
IncrementNumbers(table);
// Print the array
Console.WriteLine("Array after incrementing:");
PrintArray(table);
}
// Method to populate the array
static void PopulateArray(int[] array)
{
Console.WriteLine("Enter the elements of the array:");
for (int i = 0; i < array.Length; i++)
{
array[i] = int.Parse(Console.ReadLine());
}
}
// Method to count positive even numbers
static int CountPositiveEven(int[] array)
{
int count = 0;
foreach (int num in array)
{
if (num > 0 && num % 2 == 0)
{
count++;
}
}
return count;
}
// Method to count positive odd numbers
static int CountPositiveOdd(int[] array)
{
int count = 0;
foreach (int num in array)
{
if (num > 0 && num % 2 != 0)
{
count++;
}
}
return count;
}
// Method to increment numbers in odd and even positions
static void IncrementNumbers(int[] array)
{
for (int i = 0; i < array.Length; i++)
{
if (i % 2 == 0) // Even position
{
array[i] += 5;
}
else // Odd position
{
array[i] += 10;
}
}
}
// Method to print the array
static void PrintArray(int[] array)
{
foreach (int num in array)
{
Console.Write(num + " ");
}
Console.WriteLine();
}
}
Example7 : Write a C# program to create array table of 10 string values , and search the value elt in array and print index of string?
Sol//
using System;
class Program
{
static void Main()
{
string[] table = { "apple", "banana", "orange", "grape", "mango", "pineapple", "kiwi", "strawberry", "peach", "pear" };
Console.WriteLine("Enter the string to search:");
string elt = Console.ReadLine();
int index = SearchString(table, elt);
if (index != -1)
{
Console.WriteLine($"The string '{elt}' is found at index {index}.");
}
else
{
Console.WriteLine($"The string '{elt}' is not found in the array.");
}
}
// Method to search for a string in the array and return its index
static int SearchString(string[] array, string value)
{
for (int i = 0; i < array.Length; i++)
{
if (array[i] == value)
{
return i;
}
}
return -1; // String not found
}
}