CODEWITHSUNDEEP
c#.net
MindGame
MindGame

Reputation: 1251

Detect Leading Zero in String

I'm currently trying to detect if a number has a leading zero. Not sure what the best way is to detect that. An example would something like this "000445454"

Upvotes: 2

Views: 7180

Answers (4)

JJY9
JJY9

Reputation: 623

I am not familiar with c# syntax

But in C++ in order to find 00, 05, 01 , i tend to do this:

We can find the index of first zero from left using

index = str.find('0');

And now check if index == 0 means leading ZERO and the length of string is greater than 1

if(index ==0 and str.length()>1){
    cout<<"Leading Zero";
}

Upvotes: 0

Jaydeep Shil
Jaydeep Shil

Reputation: 1959

string str = "0";
if(str.StartsWith("0") && str.Length !=1) Console.WriteLine("false");
else Console.WriteLine("true");

if the string starts with '0' and if it has more than one character.

Upvotes: 0

Ralph Meixner
Ralph Meixner

Reputation: 11

One easy way to detect a leading zero in a non empty "s" string is to compare its first element with the character '0':

s[0] == '0'

Upvotes: 1

Cyral
Cyral

Reputation: 14153

Use String.StartsWith

"Determines whether the beginning of this string instance matches a specified string."

string numbers =  "000445454";
if (numbers.StartsWith("0"))
    //Do Something

Upvotes: 11

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