C++ Basics Practice

Practise C++ variables, data types, arithmetic operators, integer division, type conversion and formatted output.

Beginner7 problemsUpdated October 23, 2026

Review first: Variables, Data Types, Operators, Type Conversion, Constants

1.Split the bill

Beginner

A dinner costs 1850 rupees and 4 friends split it equally. Print each share with exactly two decimal places, like Each person pays 462.50.

Show hint

Make sure the division is done in floating point, then use std::fixed and std::setprecision(2) from <iomanip>.

Show solution

C++

#include <iomanip>
#include <iostream>

int main() {
    double total = 1850;
    int people = 4;

    double share = total / people;
    std::cout << std::fixed << std::setprecision(2);
    std::cout << "Each person pays " << share << '\n';
}

Output

Each person pays 462.50

2.Minutes to hours and minutes
Beginner
A film lasts 135 minutes. Print it as 2 h 15 min.
Show hint
Integer / gives the whole hours and % gives the minutes left over.
Show solution
C++
#include <iostream> int main() { int minutes = 135; std::cout << minutes / 60 << " h " << minutes % 60 << " min\n"; }
Output
2 h 15 min
3.Temperature conversion
Beginner
Convert a body temperature of 36.6 °C to Fahrenheit (F = C × 9 / 5 + 32) and print it with one decimal place.
Show hint
Use double for the temperature, and std::fixed with std::setprecision(1).
Show solution
C++
#include <iomanip> #include <iostream> int main() { double celsius = 36.6; double fahrenheit = celsius * 9 / 5 + 32; std::cout << std::fixed << std::setprecision(1) << fahrenheit << " F\n"; }
Output
97.9 F
The exact value is 97.88, which rounds to 97.9 with one decimal place.
4.Fix the average
Beginner
The average of the marks 7, 8 and 10 should be about 8.33, but int sum = 25; double avg = sum / 3; gives 8. Print the wrong result and then the correct one.
Show hint
sum / 3 divides two integers before the result is stored. Cast one operand to double first.
Show solution
C++
#include <iostream> int main() { int sum = 7 + 8 + 10; double wrong = sum / 3; double right = static_cast<double>(sum) / 3; std::cout << wrong << '\n' << right << '\n'; }
Output
8 8.33333
std::cout prints at most 6 significant digits by default, so 8.333333… appears as 8.33333.

5.First and last digit

Beginner

For the 4-digit number 4096, print its first digit, its last digit, and their sum.

Show hint

The last digit is n % 10. For a 4-digit number, the first digit is n / 1000.

Show solution

C++

#include <iostream>

int main() {
    int n = 4096;
    int first = n / 1000;
    int last = n % 10;
    std::cout << first << ' ' << last << ' ' << first + last << '\n';
}

Output

4 6 10

6.Avoid integer overflow
Beginner
A square stadium floor is 50000 mm on each side. Print its area in square millimetres. The answer is larger than an int can hold.
Show hint
50000 * 50000 overflows a 32-bit int. Do the multiplication in long long.
Show solution
C++
#include <iostream> int main() { long long side = 50000; long long area = side * side; std::cout << area << '\n'; }
Output
2500000000
An int holds up to 2,147,483,647, and 2,500,000,000 is bigger. Because side is a long long, the multiplication itself is done in 64 bits. Writing int side = 50000; long long area = side * side; would still overflow, because the multiplication happens in int before the result is stored.
7.Characters are numbers
Beginner
Given char letter = 'C';, print the next letter of the alphabet and the numeric code of letter.
Show hint
A char is a small integer, so letter + 1 is the next code. Cast to char to print it as a letter, and to int to print the code.
Show solution
C++
#include <iostream> int main() { char letter = 'C'; char next = static_cast<char>(letter + 1); std::cout << next << ' ' << static_cast<int>(letter) << '\n'; }
Output
D 67

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