Develop Reference

Is there a way to throw an exception when string is typed in an arrayc#?

I am new in this fascinating world of programming. I have done this array, but when I type a non integer it crashes. I have tried many ways like int.Parse(console.readLine)), tryparse(text, out int) and ConvertTo32 ,However it continues saying that "Input string was not in correct format." Thanks
using System;
namespace BubbleSort
{
class Program
{
public static void HelpME(int[] a, int t)
{
for (int j = 0; j <= a.Length - 2; j++)
{
for (int i = 0; i <= a.Length - 2; i++)
{
if (a[i] > a[i + 1])
{
t = a[i + 1];
a[i + 1] = a[i];
a[i] = t;
}
}
}
}
static void Main(string[] args)
{
int[] num = { 1, 2, 3, 4, 5 };
int[] a = new int[5];
for (int x = 0; x < 5; x++)
{
Console.WriteLine($"Input enter {num[0 + x]} of five");
a[0 + x] = Convert.ToInt32(Console.ReadLine());
}
Console.WriteLine("The Array is : ");
for (int i = 0; i < a.Length; i++)
{
Console.WriteLine(a[i]);
}
{
HelpME(num, 5);
}
Console.WriteLine("The Sorted Array :");
foreach (int aray in a)
{
Console.Write(aray + " ");
}
Console.ReadLine();
}
}
}

you should validate the user unput by using int.TryParse method. If the entered string can be converted to int then only it should be inserted into the array, otherwise the program should ignore that value.
static void Main(string[] args)
{
int[] num = { 1, 2, 3, 4, 5 };
int[] a = new int[5];
for (int x = 0; x < 5; x++)
{
Console.WriteLine($"Input enter {num[0 + x]} of five");
int temp = 0;
string input = Console.ReadLine();
if(int.TryParse(input, out temp))
{
a[0 + x] = Convert.ToInt32(input);
}
}
Console.WriteLine("The Array is : ");
for (int i = 0; i < a.Length; i++)
{
Console.WriteLine(a[i]);
}
{
HelpME(num, 5);
}
Console.WriteLine("The Sorted Array :");
foreach (int aray in a)
{
Console.Write(aray + " ");
}
Console.ReadLine();
}

triangle paramid using for loop in C# [duplicate]

This question already has an answer here:
C# program to develop a pyramid, using for loop [closed]
(1 answer)
Closed 6 years ago.
i can't solve my triangle program in school , it is printing one sided curve by this program
using System;
namespace starpyramid
{
class program
{
static void Main()
{
Console.Write("Height: ");
int i = int.Parse(Console.ReadLine());
if(i>0)
{
goto main;
}
else
{
Main();
}
main:
Console.Write("\n");
for (int h = 1; h<= i;h++) // main loop for the lines
{
for (int s = h; s <= i; s++) //for spaces before the stars
{
Console.Write(" ");
}
for(int j=1; j<(h*2); j=j+2)
{
Console.Write("*");
}
Console.Write("\n");
}
}
}
}
but i need to modify it by something that make this a proper triangle !

Here is one solution:
public static void DrawPyramid(int Rows)
{
string Pyramid = string.Empty;
int n = Rows;
for (int i = 0; i <= n; i++)
{
for (int j = i; j < n; j++)
{
Pyramid += " ";
}
for (int k = 0; k < 2 * i - 1; k++)
{
Pyramid += "*";
}
Pyramid += Environment.NewLine;
}
Pyramid.ConsoleWrite();
}
Example:
DrawPyramid(5);
// *
// ***
// *****
// *******
// *********

C# program for printing numbers triangle?

class Triangle
{
static void Main(string[] args)
{
int i,j,k,odd=1,size,s=0;
Console.Write("Enter the Size:");
size = Convert.ToInt32(Console.ReadLine());
int nofSpaces=size-1;
for (i = 1; i <= size; i++)
{
for (k = 1; k <= nofSpaces; k++)
{
Console.Write(" ");
}
for (j = 1; j <= odd; j++)
{
if (i >= j)
{
s = s + 1;
}
else
{
s = s - 1;
}
Console.Write(s);
}
Console.Write("\n");
odd = odd + 2;
nofSpaces = nofSpaces - 1;
}
Console.ReadKey();
}
}
This is the code and it gives the following result:
1
232
34543
4567654
56789875
But I need the result like this:
1
121
12321
1234321
---------
Any help would be greatly appreciated. Thank you.

Add
s = 0;
at the right line in your code.

class Triangle
{
static void Main(string[] args)
{
int i,j,k,odd=1,size;
Console.Write("Enter the Size:");
size = Convert.ToInt32(Console.ReadLine());
int nofSpaces=size-1;
int s = 0;
for (i = 1; i <= size; i++)
{
int g = 0;
for (k = 1; k <= nofSpaces; k++)
{
Console.Write(" ");
}
for (j = 1; j <= odd; j++)
{
if (i >= j)
{
Console.Write(j);
g = j;
}
else
{
//for (int n = j-1; n >= i; n--)
//{
// Console.Write(n - 1);
//}
Console.Write(--g);
}
}
Console.Write("\n");
odd = odd + 2;
nofSpaces = nofSpaces - 1;
}
Console.ReadKey();
}
}
}
Thank you All!... The above code is working....

You should try this...
This is a simple example with for loops
class Triangle
{
static void Main(string[] args)
{
int size;
Console.Write("Enter the Size:");
size = Convert.ToInt32(Console.ReadLine());
for (int i = 0; i < size; i++)
{
for (int j = size ; j > i; j--)
{
Console.Write(" ");
}
for (int x = 1; x <= i; x++)
{
Console.Write(x);
}
for (int j = i-1; j > 0; j--)
{
Console.Write(j);
}
Console.WriteLine();
}
Console.ReadKey();
}
}

Please write as below
static void Main(string[] args)
{
int i, j, k, odd = 1, size, s = 0;
Console.Write("Enter the Size:");
size = Convert.ToInt32(Console.ReadLine());
int nofSpaces = size - 1;
for (i = 1; i <= size; i++)
{
for (k = 1; k <= nofSpaces; k++)
{
Console.Write(" ");
}
s = 0;
for (j = 1; j <= odd; j++)
{
if (i >= j)
{
s = s + 1;
}
else
{
s = s - 1;
}
Console.Write(s);
}
Console.Write("\n");
odd = odd + 2;
nofSpaces = nofSpaces - 1;
}
Console.ReadKey();
}

Number of zeroes at the end of factorial

I need to find the number of zeroes at the end of a factorial number. So here is my code, but it doesn't quite work :/
using System;
class Sum
{
static void Main(string[] args)
{
int n = int.Parse(Console.ReadLine());
long factoriel = 1;
for (int i = 1; i <= n; i++)
{
factoriel *= i;
}
Console.WriteLine(factoriel);
int timesZero = 0;
while(factoriel % 10 != 0)
{
timesZero++;
}
Console.WriteLine(timesZero);
}
}
I know I can use a for loop and divide by 5, but I don't want to. Where is the problem in my code and why isn't it working?

There's problem with your algorithm: integer overflow. Imagine, that you are given
n = 1000
and so n! = 4.0238...e2567; you should not compute n! but count its terms that are in form of (5**p)*m where p and m are some integers:
5 * m gives you one zero
25 * m gives you two zeros
625 * m gives you three zeros etc
The simplest code (which is slow on big n) is
static void Main(string[] args) {
...
int timesZero = 0;
for (int i = 5; i <= n; i += 5) {
int term = i;
while ((term % 5) == 0) {
timesZero += 1;
term /= 5;
}
}
...
}
Much faster implementation is
static void Main(string[] args) {
...
int timesZero = 0;
for (int power5 = 5; power5 <= n; power5 *= 5)
timesZero += n / power5;
...
}

Counting Trailing zeros in Factorial
static int countZerosInFactOf(int n)##
{
int result = 0;
int start = 1;
while (n >= start)
{
start *= 5;
result += (int)n/start;
}
return result;
}

Make sure to add inbuilt Reference System.Numeric
using System.Text;
using System.Threading.Tasks;
using System.Numeric
namespace TrailingZeroFromFact
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Enter a no");
int no = int.Parse(Console.ReadLine());
BigInterger fact = 1;
if (no > 0)
{
for (int i = 1; i <= no; i++)
{
fact = fact * i;
}
Console.WriteLine("{0}!={1}", no, fact);
string str = fact.ToString();
string[] ss = str.Split('0');
int count = 0;
for (int i = ss.Length - 1; i >= 0; i--)
{
if (ss[i] == "")
count = count + 1;
else
break;
}
Console.WriteLine("No of trailing zeroes are = {0}", count);
}
else
{
Console.WriteLine("Can't calculate factorial of negative no");
}
Console.ReadKey();
}
}
}

static void Main(string[] args)
{
Console.WriteLine("Enter the number:");
int n = int.Parse(Console.ReadLine());
int zero = 0;
long fac=1;
for (int i = 1; i <= n; i++)
{
fac *= i;
}
Console.WriteLine("Factorial is:" + fac);
ab:
if (fac % 10 == 0)
{
fac = fac / 10;
zero++;
goto ab;
}
else
{
Console.WriteLine("Zeros are:" + zero);
}
Console.ReadLine();
}

Your code seems fine, just a little correction in the while-condition:
public static int CalculateTrailingZeroes(BigInteger bigNum)
{
int zeroesCounter = 0;
while (bigNum % 10 == 0)
{
zeroesCounter++;
bigNum /=10;
}
return zeroesCounter;
}
That works, I just tested it.

C# Multiplication Table

So I'm attempting to print a multiplication table in C# however I can't quite figure out how to get what I need.
So far my program outputs the following:
1 2 3
2 4 6
3 6 9
However, I need it to output this:
0 1 2 3
1 1 2 3
2 2 4 6
3 3 6 9
I've tried a lot of different ways to get the second output however I can't quite figure it out. I'm not necessarily asking for an answer but if someone could point me in the right direction it would be much appreciated.
This is the code I have as of now:
static void Main(string[] args)
{
for (int i = 1; i <= 3; i++)
{
for (int j = 1; j <= 3; j++)
{
Console.Write(i * j + "\t");
}
Console.Write("\n");
}
Console.ReadLine();
}

for (int i = 0; i <= 3; i++)
{
Console.Write(i + "\t");
for (int j = 1; j <= 3; j++)
{
if (i>0) Console.Write(i * j + "\t");
else Console.Write(j + "\t");
}
Console.Write("\n");
}

int tbl= int.Parse(Console.ReadLine());
int j = int.Parse(Console.ReadLine());
for (int i=1; i<=10; i++)
{
for (int j=1;j<=10; j++)
{
Console.WriteLine("{0}*{1}={2}", i, j, (i * j));`enter code here`
}
}
Console.ReadLine();

You should skip both 0's.
for (int i = 0; i <= 3; i++)
{
for (int j = 0; j <= 3; j++)
{
Console.Write((i == 0? j : (j == 0? i : i*j)) + "\t");
}
Console.Write("\n");
}

You could try one of this three solutions.
Solution 1 (without if else statement):
static void Main(string[] args)
{
for (int i = 0; i <= 3; i++)
{
Console.Write("{0}\t", i);
for (int j = 1; j <= 3; j++)
{
Console.Write("{0}\t", i * j);
}
Console.WriteLine();
}
Console.ReadLine();
}
Solution 2 (With if else statement):
static void Main(string[] args)
{
for (int i = 0; i <= 3; i++)
{
for (int j = 1; j <= 3; j++)
{
if (i == 0)
{
Console.Write("{0}\t", i);
}
else
{
Console.Write("{0}\t", i * j);
}
}
Console.WriteLine();
}
Console.ReadLine();
}
Solution 3 (With short-hand if else statement):
static void Main(string[] args)
{
for (int i = 0; i <= 3; i++)
{
for (int j = 1; j <= 3; j++)
{
Console.Write("{0}\t", (i == 0) ? i : i * j);
}
Console.WriteLine();
}
Console.ReadLine();
}

for (int i = 0; i <= 3; i++)
{
for (int j = 0; j <= 3; j++)
{
if (i == 0)
{
Console.Write(j);
}
else
{
if(j == 0)
{
Console.Write(i);
}
else
{
Console.Write(i * j);
}
}
}
Console.Write("\n");
}

Console.WriteLine("Enter A Number");
int j = Convert.ToInt32(Console.ReadLine());
for (int i = 0 ; i <= 10; i++) {
Console.WriteLine("{1} X {0} = {2}",i,j,i*j);
Console.ReadLine();
}

public class Program
{
//int num;
public static void Main(string[] args)
{
int num,num1;
Console.WriteLine("enter a any number num");
num = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("enter any second number num1");
num1 = Convert.ToInt32(Console.ReadLine());
for(int i = num;i <= num1; i++)
{
for (int j = 1; j <= 10; j++)
{
Console.Write(i *j+ "\t");
}
}
Console.Write("\n");
}
}

using System;
/*
* Write a console-based application that displays a multiplication table of the product of
* every integer from 1 through 10 multiplied by every integer from 1 through 10. Save the
* file as DisplayMultiplicationTable.cs.
*/
namespace MultiplicationTable
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("\t\t\t\t\t\t\t\t\tMultiplication Table");
Console.WriteLine("------------------------------------------------------------------------------------------------------------------------------------------------------------");
const int END = 11;
for(int x = 1; x < END; x++)
{
for(int y = 1; y < END; y++)
{
int value = x * y;
Console.Write("{0} * {1} = {2}\t", y, x, value);
}
Console.WriteLine();
}
Console.ReadLine();
}
}
}
Output
Output of Code
I am attempting to complete the above code in a GUI. So far I have come up with the following code; but the output is not like the above output.
My Code for the GUI is as follows:
using System;
using System.Windows.Forms;
namespace DisplayMultiplicationTableGUI
{
public partial class Form1:Form
{
public Form1()
{
InitializeComponent();
}
private void ShowTableButton_Click(object sender, EventArgs e)
{
int a;
int b;
const int STOP = 11;
for(a = 1; a < STOP; a++)
{
for(b = 1; b < STOP; b++)
{
int value = a * b;
multiplicationTableLabel.Text += String.Format("{0} * {1} = {2} ", b, a, value);
}
multiplicationTableLabel.Text += "\n";
}
}
}
}