Beginner C/C++ Exercises

Multiplication Table

A counted loop can generate a predictable formatted table.

What is Multiplication Table?

A counted loop can generate a predictable formatted table.

Print a multiplication table for one number.

Important points

Compile with warnings enabled and fix every warning.
Know the lifetime and type of every value.
Validate input and keep array bounds explicit.

C and C++ code examples

Run code →

main.c

#include <stdio.h>
int main(void) {
    int number = 7;
    // Generate the first five rows.
    for (int multiplier = 1; multiplier <= 5; ++multiplier)
        printf("%d x %d = %d\n", number, multiplier, number * multiplier);
}

Expected output

C++

Run code →

main.cpp

#include <iostream>
int main() {
    int number = 7;
    // Generate the first five rows.
    for (int multiplier = 1; multiplier <= 5; ++multiplier)
        std::cout << number << " x " << multiplier << " = " << number * multiplier << '\n';
}

Expected output

C and C++ comparison

The loop counter supplies each multiplier and the product is calculated for display.

C exposes small procedural APIs and makes representation details explicit.

C++

C++ retains the low-level model while adding safer library types and abstractions.

Practice exercises

Run both versions, then modify them to observe the different language guarantees.

Add invalid and boundary-value inputs.
Compile with -Wall -Wextra -Wpedantic.
Move reusable declarations into a header and implementation file.