IBM Placement Paper - Programming Question And Answers

IBM Previous Years Solved Sample Placement Papers

1. Reverse a String in Java

import java.io.*;
import java.util.Scanner;

class PrepBytes {
    public static void main (String[] args) {    
        String str = "PrepBytes", nstr = "";
        char ch;    
        System.out.print("Original word: ");
        System.out.println("PrepBytes");    
        for (int i = 0; i < str.length(); i++) {
            ch = str.charAt(i); 
            nstr = ch + nstr;
        }
        System.out.println("Reversed word: " + nstr);
    }
}
    

2. C Program to Find the Largest Number Among Three Numbers

#include 

int main() {
    int A, B, C;
    printf("Enter the numbers A, B and C: ");
    scanf("%d %d %d", &A, &B, &C);
    
    if (A >= B && A >= C)
        printf("%d is the largest number.\n", A);
    if (B >= A && B >= C)
        printf("%d is the largest number.\n", B);
    if (C >= A && C >= B)
        printf("%d is the largest number.\n", C);
    
    return 0;
}
    

3. Compute Average of Two Numbers Without Overflow (C++)

#include 
using namespace std;

int compute_average(int a, int b) {
    return (a + b) / 2;
} 

int main() {
    int a = INT_MAX, b = INT_MAX;
    cout << "Actual average: " << INT_MAX << endl;
    cout << "Computed average: " << compute_average(a, b) << endl;
    return 0;
}
    

4. Check if a Given Number is Prime or Not (C++)

#include 
using namespace std;  

bool isPrime(int n) {
    if (n <= 1)
        return false;

    for (int i = 2; i <= sqrt(n); i++)
        if (n % i == 0)
            return false;

    return true;
}

int main() {
    isPrime(11) ? cout << "true\n" : cout << "false\n";
    return 0;
}
    

5. C++ Program to Generate Fibonacci Triangle

#include
using namespace std;  

int main() {  
    int a = 0, b = 1, i, c, n, j;    
    cout << "Enter the limit: ";   
    cin >> n;    
    for(i = 1; i <= n; i++) {    
        a = 0;    
        b = 1;    
        cout << b << "\t";   
        for(j = 1; j < i; j++) {    
            c = a + b;    
            cout << c << "\t";    
            a = b;    
            b = c;  
        }    
        cout << "\n";    
    }  
    return 0;  
}