Before you move forward, it is helpful to recall what you have learned about variables and operators in C. You have already seen how to declare variables of different data types, such as `int`, `float`, and `char`, and how to assign values to them. Operators allow you to perform calculations or modify variable values. Arithmetic operators like `+`, `-`, `*`, `/`, and `%` are commonly used to compute results using variables. Understanding how to combine variables and operators is essential for solving real-world problems in C programming.


#define CATCH_CONFIG_MAIN
#include <catch2/catch.hpp>

int _testmain();


int calculate_expression(int a, int b, int c);

TEST_CASE("calculate_expression returns correct result for positive integers", "[calculate_expression]") {
    REQUIRE(calculate_expression(5, 3, 2) == 16); // (5 + 3) * 2 = 16
    REQUIRE(calculate_expression(10, 20, 3) == 90); // (10 + 20) * 3 = 90
}

TEST_CASE("calculate_expression returns correct result when one or more inputs are zero", "[calculate_expression]") {
    REQUIRE(calculate_expression(0, 0, 5) == 0); // (0 + 0) * 5 = 0
    REQUIRE(calculate_expression(4, 0, 0) == 0); // (4 + 0) * 0 = 0
    REQUIRE(calculate_expression(0, 7, 2) == 14); // (0 + 7) * 2 = 14
}

TEST_CASE("calculate_expression returns correct result for negative integers", "[calculate_expression]") {
    REQUIRE(calculate_expression(-2, -3, 4) == -20); // (-2 + -3) * 4 = -20
    REQUIRE(calculate_expression(5, -10, 2) == -10); // (5 + -10) * 2 = -10
    REQUIRE(calculate_expression(-4, 2, -3) == 6); // (-4 + 2) * -3 = 6
}

test.cpp

A comprehensive introduction to the C programming language, covering essential concepts, syntax, and practical skills for beginners. This course blends clear explanations with hands-on practice to build a solid foundation in C.

Learn the basic structure of a C program and how to write your first code.

Understand how to declare variables, use different data types, and perform operations in C.

Learn how to control the flow of your C programs using conditional statements.

Master the use of loops to perform repetitive tasks efficiently in C.

Discover how to define and use functions to organize and reuse code.

Challenge: Variable Manipulation

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