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C++ Basics: Output Practice Questions

Practice basic C++ output concepts with simple exercises on cout, variables, arithmetic expressions, and predicting console output for beginner programmers.

Instructions for Students

Read the program carefully.
Predict the output without running the code.
Write your predicted output.
Run the program to verify your answer.
Understand why the output appears.
Modify the code and predict the new output.

Question 1: Displaying Integer Values

Task: Predict the output.

Code

int x = 10;
int y = 5;

cout << x << endl;
cout << y << endl;
cout << x + y;

Question 2: Displaying Decimal Values

Task: Predict the output.

Code

float price = 25.5;
double tax = 5.25;

cout << price << endl;
cout << tax << endl;
cout << price + tax;

Question 3: Displaying Character Values

Task: Predict the output.

Code

char grade = 'A';
char section = 'B';

cout << grade << endl;
cout << section << endl;
cout << grade + 1;

Question 4: Displaying String Values

Task: Predict the output.

Code

string firstName = "Ali";
string lastName = "Ahmed";

cout << firstName << endl;
cout << lastName << endl;
cout << firstName + lastName;

Question 5: Character and Integer Values

Task: Predict the output.

Code

char letter = 'A';
int number = 5;

cout << letter << endl;
cout << letter + number << endl;
cout << char(letter + number);

Question 6: Different Data Types in One Program

Task: Predict the output.

Code

int age = 20;
float height = 5.6;
char grade = 'A';
bool isStudent = true;

cout << age << endl;
cout << height << endl;
cout << grade << endl;
cout << isStudent;

Question 7: Multiplication and Division

Task: Predict the output.

Code

int a = 20;
int b = 4;

cout << a * b << endl;
cout << a / b;

Question 8: Modulus Operator

Task: Predict the output.

Code

int a = 17;
int b = 5;

cout << a % b << endl;
cout << 20 % 3;

Question 9: Increment Operator

Task: Predict the output.

Code

int x = 5;

cout << x << endl;

x++;

cout << x << endl;

++x;

cout << x;

Question 10: Decrement Operator

Task: Predict the output.

Code

int x = 10;

cout << x-- << endl;
cout << x << endl;
cout << --x;

Question 11: Compound Assignment Operators

Task: Predict the output.

Code

int x = 10;

x += 5;
cout << x << endl;

x *= 2;
cout << x << endl;

x -= 4;
cout << x;

Question 12: Relational Operators

Task: Predict the output.

Code

int a = 10;
int b = 20;

cout << (a > b) << endl;
cout << (a < b) << endl;
cout << (a == b) << endl;
cout << (a != b);

Question 13: Logical AND Operator

Task: Predict the output.

Code

int age = 20;
int marks = 75;

cout << (age >= 18 && marks >= 50);

Question 14: Logical OR Operator

Task: Predict the output.

Code

int marks = 40;
int attendance = 80;

cout << (marks >= 50 || attendance >= 75);

Question 15: Combining Relational and Logical Operators

Task: Predict the output.

Code

int age = 22;
int marks = 85;
int attendance = 90;

bool result = (age >= 18 && marks >= 50)
              || attendance >= 95;

cout << boolalpha << result;

Question 16: Multiplication Before Addition

Task: Predict the output.

Code

int result = 10 + 5 * 2;

cout << result;

Question 17: Division Before Subtraction

Task: Predict the output.

Code

int result = 20 - 12 / 3;

cout << result;

Question 18: Multiple Arithmetic Operators

Task: Predict the output.

Code

int result = 20 + 10 / 2 * 3;

cout << result;

Question 19: Modulus and Addition

Task: Predict the output.

Code

int a = 17;
int b = 5;

int result = a + b % 3;

cout << result;

Question 20: Constant in Addition

Task: Predict the output.

Code

const int BONUS = 10;
int salary = 50000;

cout << salary + BONUS;

Question 21: Combining Constants and Variables

Task: Predict the output.

Code

const int TAX_RATE = 10;
int price = 1000;

int tax = price * TAX_RATE / 100;
int total = price + tax;

cout << tax << endl;
cout << total;

Question 22: Double to Integer Conversion

Task: Predict the output.

Code

double price = 99.75;

int result = (int) price;

cout << result;

Question 23: Integer Division Without Casting

Task: Predict the output.

Code

int a = 7;
int b = 2;

double result = a / b;

cout << result;

Question 24: Integer Division with Casting

Task: Predict the output.

Code

int a = 7;
int b = 2;

double result = (double) a / b;

cout << result;

Question 25: Character Type Casting

Task: Predict the output.

Code

int code = 65;

char letter = (char) code;

cout << letter;

Question 26: Type Casting Before Division

Task: Predict the output.

Code

int a = 10;
int b = 3;

double result = (double)(a / b);

cout << result;

Question 27: Multiple Type Conversions

Task: Predict the output.

Code

double a = 15.8;
int b = (int) a;

double c = b + 2.5;

cout << b << endl;
cout << c;

Question 28: Single-Line Comment

Task: Predict the output.

Code

int x = 10;

// cout << 20 << endl;

cout << x;

Question 29: Multiple-Line Comments

Task: Predict the output.

Code

int a = 5;

/*
cout << 10 << endl;
cout << 20 << endl;
*/

cout << a;

Question 30: Commenting Part of a Statement

Task: Predict the output.

Code

int a = 10;
int b = 5;

cout << a /* + b */ * 2;

Question 31: Comments and Variable Updates

Task: Predict the output.

Code

int number = 10;

// Increase the number
number += 5;

/*
number = number * 2;
cout << number << endl;
*/

cout << number;