[Solved] The following code throws an exception. What is the main cause?string s = "example"; int pos = s.IndexOf("z"); string part = s.Substring(pos, 3); Console.WriteLine(part); | C Sharp (C#)

C Sharp (C#) - Strings and StringBuilder

The following code throws an exception. What is the main cause?

string s = "example";
int pos = s.IndexOf("z");
string part = s.Substring(pos, 3);
Console.WriteLine(part);

ASubstring called with negative start index

BIndexOf throws exception if not found

CLength parameter is too large

DConsole.WriteLine cannot print substrings

Step-by-Step Solution

Solution:

Step 1: Check IndexOf result for "z"
"z" is not in "example", so IndexOf returns -1.
Step 2: Substring called with start index -1 causes exception
Substring cannot start at negative index, so it throws ArgumentOutOfRangeException.
Final Answer:
Substring called with negative start index -> Option A
Quick Check:
Negative index in Substring causes error [OK]

Quick Trick: Check if IndexOf is -1 before using Substring [OK]

Common Mistakes:

MISTAKES

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The following code throws an exception. What is the main cause?