Summary  
Modifying a value through a dereferenced pointer updates the memory location it points to, directly changing the original variable.

General domain of usage  
Memory management in systems programming.

When you modify the value through the **dereferenced pointer**, you are essentially modifying **the content of the memory location** it points to. This directly affects the original variable.

Changing the value through `*(p_variable)` **is equivalent** to changing the value of `variable`.

Note

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

void normalizeSensor(float* p_sensor);

TEST_CASE("Sensor value -5 should normalize to 0", "[normalizeSensor]") {
    float sensor = -5.0f;
    normalizeSensor(&sensor);
    float expected = 0.0f;
    REQUIRE(sensor == expected);
}

TEST_CASE("Sensor value 150 should normalize to 100", "[normalizeSensor]") {
    float sensor = 150.0f;     
    normalizeSensor(&sensor);
    float expected = 100.0f;    
    REQUIRE(sensor == expected);
}

TEST_CASE("Sensor value 75 should remain 75 after normalization", "[normalizeSensor]") {
    float sensor = 75.0f;      
    normalizeSensor(&sensor);
    float expected = 75.0f;     
    REQUIRE(sensor == expected);
}

TEST_CASE("Sensor value 0 should remain 0 after normalization", "[normalizeSensor]") {
    float sensor = 0.0f;      
    normalizeSensor(&sensor);
    float expected = 0.0f;     
    REQUIRE(sensor == expected);
}

TEST_CASE("Sensor value 100 should remain 100 after normalization", "[normalizeSensor]") {
    float sensor = 100.0f;     
    normalizeSensor(&sensor);
    float expected = 100.0f;    
    REQUIRE(sensor == expected);
}

test.cpp

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Link Between Pointer and Variable

解答