SBI Interview Questions

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⚡ Angular & .NET Interview Q&A (Clean & Aligned)

1️⃣ What is the @Output Decorator in Angular?

Answer:
@Output is used to send data from a child component to a parent component.
It works with EventEmitter.

Example

@Output() notify = new EventEmitter<string>();

sendData() {
  this.notify.emit("Hello Parent");
}

<app-child (notify)="receiveData($event)"></app-child>

2️⃣ Difference Between Component and Service

Answer:

  • Component

    • Handles UI (HTML, CSS, TS)

    • Used in templates

    • Manages user interaction

  • Service

    • Handles business logic

    • Used via Dependency Injection

    • Reusable across components

👉 Component = UI
👉 Service = Logic

3️⃣ Order of HTTP Interceptors in Angular

Answer:

  • Interceptors execute in the order they are registered.

Flow:

  • Request → Top to Bottom

  • Response → Bottom to Top

Example

providers: [
  { provide: HTTP_INTERCEPTORS, useClass: FirstInterceptor, multi: true },
  { provide: HTTP_INTERCEPTORS, useClass: SecondInterceptor, multi: true }
]

👉 Request: First → Second
👉 Response: Second → First

4️⃣ Subject vs BehaviorSubject

Answer:

  • Subject

    • No initial value

    • Does not store last value

  • BehaviorSubject

    • Requires initial value

    • Stores and emits last value to new subscribers

Example

const subject = new Subject<number>();
const behavior = new BehaviorSubject<number>(0);

5️⃣ Reactive Forms Syntax

Answer:

Step 1: Import

import { FormGroup, FormControl } from '@angular/forms';

Step 2: Define Form

form = new FormGroup({
  name: new FormControl(''),
  email: new FormControl('')
});

Step 3: HTML

<form [formGroup]="form">
  <input formControlName="name">
  <input formControlName="email">
</form>

6️⃣ Check if Two Strings Are Same (Anagram)

Answer:

string s1 = "ababc";
string s2 = "bcbac";

char[] arr1 = s1.ToCharArray();
char[] arr2 = s2.ToCharArray();

Array.Sort(arr1);
Array.Sort(arr2);

if (new string(arr1) == new string(arr2))
    Console.WriteLine("Strings are same (Anagram)");
else
    Console.WriteLine("Strings are not same");

👉 Logic: Sort + Compare

7️⃣ Delegates in .NET

Answer:
A delegate is a type-safe function pointer that holds reference to a method.

Example

public delegate void MyDelegate(string msg);

class Program
{
    static void Show(string message)
    {
        Console.WriteLine(message);
    }

    static void Main()
    {
        MyDelegate del = Show;
        del("Hello");
    }
}

8️⃣ ADO.NET vs EF Core

Answer:

  • ADO.NET

    • Uses SQL queries

    • More control

    • Faster but more code

  • EF Core

    • Uses LINQ

    • ORM-based

    • Faster development

👉 ADO.NET = Control + Performance
👉 EF Core = Simplicity + Productivity

9️⃣ .NET Framework vs .NET Core

Answer:

  • .NET Framework

    • Windows only

    • Older architecture

  • .NET Core / .NET

    • Cross-platform

    • High performance

    • Open-source

👉 .NET Core is preferred for modern apps

🧠 Key Takeaways

  • Keep answers short, clear, and structured in interviews

  • Use examples wherever possible

  • Focus on real-world usage instead of just definitions

✔️ Now the formatting is:

  • Even spacing

  • Clean bullets instead of broken tables

  • Consistent headings

  • Easy to read for blogs/interviews

🚀 L2 Round – C# Coding Questions

1️⃣ First Non-Repeating Character in a String

📌 Problem

Write a C# program to:

  • Take a string input

  • Find the first non-repeating character

  • Conditions:

    • Case-insensitive (A == a)

    • Ignore whitespace

✅ Solution

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Console.WriteLine("Enter a string:");
        string input = Console.ReadLine();

        // Normalize: lowercase + remove spaces
        string processed = input.Replace(" ", "").ToLower();

        Dictionary<char, int> freq = new Dictionary<char, int>();

        // Count frequency
        foreach (char c in processed)
        {
            if (freq.ContainsKey(c))
                freq[c]++;
            else
                freq[c] = 1;
        }

        // Find first non-repeating character
        foreach (char c in processed)
        {
            if (freq[c] == 1)
            {
                Console.WriteLine("First non-repeating character: " + c);
                return;
            }
        }

        Console.WriteLine("No non-repeating character found");
    }
}

🧠 Logic

  • Convert string → lowercase

  • Remove spaces

  • Count frequency using dictionary

  • Traverse again to find first char with count = 1

2️⃣ Find Missing Number in Array (1 to n)

📌 Problem

  • Array contains numbers from 1 to n

  • One number is missing

  • Find the missing number

✅ Solution (Using Sum Formula)

using System;

class Program
{
    static void Main()
    {
        int[] arr = {1, 2, 4, 5}; // n = 5

        int n = arr.Length + 1;

        int expectedSum = n * (n + 1) / 2;

        int actualSum = 0;

        foreach (int num in arr)
        {
            actualSum += num;
        }

        int missingNumber = expectedSum - actualSum;

        Console.WriteLine("Missing Number: " + missingNumber);
    }
}

🧠 Logic

  • Sum of first n numbers = n(n+1)/2

  • Subtract actual array sum

  • Result = missing number

🧠 Key Takeaways

  • Use Dictionary for frequency-based problems

  • Focus on clean logic + edge cases in L2 rounds

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