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Hello i got a string that im converting to a char
and cheking if it has a digit but i got a bug when i type like
122Abssde it goes thru anny suggestions?
foreach (char cha in myString)
{
if(char.IsDigit(cha))
{
return Int32.Parse(MyString)
}
}
I feel like taking risk to answer that but you can use Enumerable.All with char.IsDigit method and parse it to int like;
if(myString.All(char.IsDigit))
{
return int.Parse(myString);
}
Or better, use int.TryParse to check your string is valid integer or not.
write a function
public static bool isNumeric(string val, System.Globalization.NumberStyles NumberStyle)
{
Int32 result;
return Int32.TryParse(val, NumberStyle,
System.Globalization.CultureInfo.CurrentCulture, out result);
}
usage
var _isNumeric2 = isNumeric("9.", System.Globalization.NumberStyles.Integer);
Related
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In the Main function, declare three integer variables (name them arbitrarily) and initialize these variables with values (ideally different). Write a program that computes the following arithmetic expression: Multiply the values of the last two variables and subtract the value of the first variable from the obtained result. Write the arithmetic expression and its result on the screen in a suitable way.
using System;
namespace ConsoleApp4
{
class Program
{
static void Main(string[] args)
{
int prvni = 10;
int druha = 20;
int treti = 30;
int vysledek = (treti * druha) - prvni;
Console.WriteLine("Výsledek: {vysledek}");
}
}
}
String-interpolation in that way requires a $ (dollar-sign) before the string to specify that you are doing interpolation, so: Console.WriteLine($"Výsledek: {vysledek}");
For more examples on string interpolation: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated
An alternative solution could be to simply concatenate the variable to the string: Console.WriteLine("Výsledek: " + vysledek);
You need to print the varable correctly.
Console.WriteLine("the answer {0}", vysledek);
Take care,
Ori
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I have been doing some C# practice problems for a while and I want to start playing with ternary operations to make my code cleaner.
Here is my code:
public static string Bomb(string txt)
{
txt.ToLower().Contains("bomb") == true ? "Duck!!!" : "There is no bomb, relax.";
}
So basically if Bomb("xxxxxx") contains the string "bomb" it will return "Duck!!!" if not it will return "There is no bomb, relax."
But for some reason, this doesn't work and I can't figure out why.
You just need to add return
public static string Bomb(string txt)
{
return txt.ToLower().Contains("bomb") == true ? "Duck!!!" : "There is no bomb, relax.";
}
Your ternary operator looks OK, but you're missing a return statement from the function. Also note that Contains returns a boolean, so the == true is redundant:
So I have been doing some c# practice problems for a while and I want to start playing with ternary operations to make my code cleaner.
Here is my code:
public static string Bomb(string txt)
{
return txt.ToLower().Contains("bomb") ? "Duck!!!" : "There is no bomb, relax.";
}
you missed the return part in the function
public static string Bomb(string txt)
{
return txt.ToLower().Contains("bomb") ? "Duck!!!" : "There is no bomb, relax.";
}
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Question: My else-statement is unreachable, what am i doing wrong?
very VERY new at programming and i'm trying to compare the type so for example people can't enter strings when i'm asking for integers.
My code is probably pretty bad, if i could get a header what to do and why the if-argument skips the else-part i'd be really happy!
Thanks!
class Program
{
static void Main(string[] args)
{
int integer = 0;
start:
Console.WriteLine("How old are you?: ");
int svar = int.Parse(Console.ReadLine());
Utility.CompareTypes(svar, integer);
if (true)
{
Console.WriteLine("Thanks");
}
else
{
Console.WriteLine("You have to enter a number!");
goto start;
}
}
}
class Utility
{
public static bool CompareTypes<T01, T02>(T01 type01, T02 type02)
{
return typeof(T01).Equals (typeof(T02));
}
}
:c
It's not really a question of code, but of logic...
if (true) // <--- this will ALWAYS be true
{
Console.WriteLine("Thanks");
}
else // <--- therefore this will NEVER happen
{
Console.WriteLine("You have to enter a number!");
goto start;
}
Since your else block can never possibly execute under any logical circumstance, the entire block of code can be simplified to:
Console.WriteLine("Thanks");
In order for the else block to execute, the condition checked in the if statement needs to be false. You're currently not checking any actual condition, just a hard-coded true value.
Perhaps you meant to use the result of the previous line of code? Something like this:
var typesAreSame = Utility.CompareTypes(svar, integer);
if (typesAreSame)
{
//...
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I have a pre defined string as Follows.
string preDefined="abc"; // or i can use char array in here
string value="ac";
string value1="abw";
I need some function to compare value with preDefined.
(value.SomefunctionContains(preDefined)
this function needs to return
value -> true;
value1 -> false
I knew that i can't use contains() or Any(). so plz help
You are just looking for if value has any character that is not in predefined, so this should do it:
!value.Any(x => !predefined.Contains(x))
Or it's more clear using All:
value.All(predefined.Contains);
private bool SomeFunction(string preDefined, string str)
{
foreach (char ch in str)
{
if (!preDefined.Contains(ch))
{
return false;
}
}
return true;
}
You can implement the following method to get the result :
private static bool DoesContain(string predefined, string value)
{
char[] c_pre = predefined.ToCharArray();
char[] c_val = value.ToCharArray();
char[] intersection = c_pre.Intersect(c_val).ToArray();
if (intersection.Length == c_val.Length) {
return true;
}
else {
return false;
}
}
Please not that this solution is a generalized implementation. IT also returns true even if the characters are not in the same order, unless ther include all.
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Ok i Edited post to short version i want to ask about methods in c#: TryGetValue and sorting list by the compare (IComparator).
I need write this methods in Java so I wrote this code. Asking to developers which know both this language is that correct??
1) First question- TryGetValue is that methods wrote in Java make the same?
c#:
Node value;
if (!nodes.TryGetValue(nodeId,out value)) return false;
to Java:
Node value;
if (!nodes.containsKey(nodeId)){
return false;
}else{
value = nodes.get(nodeId);
}
2)And Sorting by the comparator in java work the same?
static int compareNodes(Node n1, Node n2)
{
if (n1.f > n2.f) return 1;
if (n1.f < n2.f) return -1;
return 0;
}
list.Sort(compareNodes);
And this in Java:
#Override
public int compare(Node nodeFirst, Node nodeSecond) {
if (nodeFirst.f > nodeSecond.f)
return 1;
if (nodeFirst.f < nodeSecond.f)
return -1;
return 0;
}
Collections.sort(nodeList, new OpenList());
After just a quick glance over your code, I can't see any real problems with it. No guarantees though.
If you really want to be sure, you should probably create unit-tests to verify the behavior in both C# and in Java. That will require a little more work, but will be a lot safer than depending on reviews here.