C# Logical Questions with Answer

Loading

C# Logical Questions with Answer

I would be very happy if someone will provide better solution for these questions -

Question 1: Exchange Two integer variable value without using third variable.

Answer:

public static void ExchangeInteger()
{
int a = 10;
int b = 5;
Console.WriteLine("a={0}", a);
Console.WriteLine("b={0}", b);
a = a + b; // Now a would be 15
b = a - b; // Now b would be 15-5=10 ........
a = a - b; // Now a would be 15-10=5........
Console.WriteLine("a={0}", a);
Console.WriteLine("b={0}", b);
Console.ReadLine();
}

Calling above method,

static void Main(string[] args)
{
clsExchangevariable.ExchangeInteger();
}

Output

Exchange Two integer variable value

Exchange Two integer variable value

Question 2: Swap neighbor char in string, For Example string “TAPAN” would be:

Answer:

public static string SwapNeighbourChar(string strToSwap)
{
char[] arraStr = strToSwap.ToCharArray();
StringBuilder strbuild = new StringBuilder();
for (int i = 0; i <= arraStr.Length - 1; i++)
{
if (i != arraStr.Length - 1)
{
strbuild.Append(arraStr[i + 1]);
}
strbuild.Append(arraStr[i]);
i = i + 1;
}
return strbuild.ToString();
}

Calling above method

static void Main(string[] args)
{
Console.WriteLine(clsSwapNeighbour.SwapNeighbourChar("TAPAN"));
Console.ReadLine();
}

Output

Swap neighbor char in string

Swap neighbor char in string

Question 3: Is prime number?

Answer:

public static bool IsPrimeNumbers(int number)
{
bool returnMsg = false;
for (int i = 2; i <= number; i++)
{
if ((number % i) == 0 && number != i)
{
returnMsg = false;
return returnMsg;
}
else if (number == i)
{
returnMsg = true;
return returnMsg;
}
}
return returnMsg;
}

Calling above method,

static void Main(string[] args)
{
string message = clsIsPrimeNumber.IsPrimeNumbers(17) == true ? "Prime Number" : "Not a prime number";
Console.WriteLine(message);
message = clsIsPrimeNumber.IsPrimeNumbers(4) == true ? "Prime Number" : "Not a prime number";
Console.WriteLine(message);
message = clsIsPrimeNumber.IsPrimeNumbers(11) == true ? "Prime Number" : "Not a prime number";
Console.WriteLine(message);
message = clsIsPrimeNumber.IsPrimeNumbers(21) == true ? "Prime Number" : "Not a prime number";
Console.WriteLine(message);
Console.ReadLine();
}

Output:

s prime number

s prime number

Question 4: Fibonacci series.

Answer:

public static void PrintFibonacciSeries(int limit)
{
int digit1, digit2, digit3;
digit1 = 0;
digit2 = 1;
digit3 = digit1 + digit2;
Console.WriteLine(digit1);
Console.WriteLine(digit2);
Console.WriteLine(digit3);
for (int i = 0; i < limit; i++)
{
digit1 = digit2;
digit2 = digit3;
digit3 = digit1 + digit2;
Console.WriteLine(digit3);
}
}

Calling above method,

static void Main(string[] args)
{
clsFibonacci.PrintFibonacciSeries(10);
Console.ReadLine();
}

Output:

ibonacci series

ibonacci series

Question 5: Get Factorial of number.

Answer:

public static int PrintFactorialOfNumber(int number)
{
// 7*6
int result = 1;
for (int i = number; i > 0; i--)
{
result = result * i;
}
return result;
}

Calling above method:

static void Main(string[] args)
{
int factorial;
factorial = clsfactorial.PrintFactorialOfNumber(5);
Console.WriteLine("Factorial Of 5 Is " + factorial.ToString());
factorial = clsfactorial.PrintFactorialOfNumber(7);
Console.WriteLine("Factorial Of 7 Is " + factorial.ToString());
Console.ReadLine();
}

Output:
Get Factorial of number

Get Factorial of number