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

int increaseSignal(int value);
int decreaseSignal(int value);

TEST_CASE("increaseSignal doubles the value using left shift", "[increaseSignal]") {
    REQUIRE(increaseSignal(4) == 8);    // 4 << 1 = 8
    REQUIRE(increaseSignal(7) == 14);   // 7 << 1 = 14
    REQUIRE(increaseSignal(0) == 0);    // 0 << 1 = 0
    REQUIRE(increaseSignal(1) == 2);    // 1 << 1 = 2
}

TEST_CASE("decreaseSignal halves the value using right shift (integer division)", "[decreaseSignal]") {
    REQUIRE(decreaseSignal(10) == 5);   // 10 >> 1 = 5
    REQUIRE(decreaseSignal(3) == 1);    // 3 >> 1 = 1
    REQUIRE(decreaseSignal(1) == 0);    // 1 >> 1 = 0
    REQUIRE(decreaseSignal(0) == 0);    // 0 >> 1 = 0
}

test.cpp

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Explore how binary numbers underpin C programming, including integer storage, signed vs unsigned types, and two’s complement.

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Challenge: Signal

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