Looking into the similarities between C language and C++

C language and C are two very popular programming languages. They are very similar in many aspects. This article will discuss their differences in detail in terms of syntax, data types, functions, object-oriented, etc. similarities and provide code examples to illustrate.

First of all, the basic grammatical structure of C language and C are very similar. They both follow the "semicolon ending" rule and use braces to define code blocks, etc. For example, the following is an example of a simple C language function and C function:

// Define a simple function in C language
#include <stdio.h>

void sayHello() {
    printf("Hello, World!
");
}

int main() {
    sayHello();
    return 0;
}

// Define a simple function in C
#include <iostream>

void sayHello() {
    std::cout << "Hello, World!" << std::endl;
}

int main() {
    sayHello();
    return 0;
}

As you can see, the function definition and calling methods in the above two examples are very similar, except for the slightly different output statements.

In addition, C language and C have similar basic data types, such as integer, floating point, character, etc. The following is an example showing C language and C integer variables:

// Define an integer variable in C language
#include <stdio.h>

int main() {
    int num = 10;
    printf("The number is: %d
", num);
    return 0;
}

// Define an integer variable in C
#include <iostream>

int main() {
    int num = 10;
    std::cout << "The number is: " << num << std::endl;
    return 0;
}

In the above example, we can see that both C language and C define an integer variable num and output its value.

In addition, the function definition and calling methods in C language and C are also very similar. The following is an example showing function parameter passing:

// Define a function that accepts parameters in C language
#include <stdio.h>

void printNumber(int num) {
    printf("The number is: %d
", num);
}

int main() {
    int number = 20;
    printNumber(number);
    return 0;
}

// Define a function in C that accepts parameters
#include <iostream>

void printNumber(int num) {
    std::cout << "The number is: " << num << std::endl;
}

int main() {
    int number = 20;
    printNumber(number);
    return 0;
}

In the above example, we have shown how to define a function that accepts parameters and call it in C language and C.

Finally, C is an object-oriented programming language developed on the basis of the C language. Therefore, C also includes object-oriented programming features such as classes, objects, inheritance, and polymorphism. Here is an example showing a C class:

// Define a simple class in C
#include <iostream>

class Person {
public:
    std::string name;
    int age;

    void displayInfo() {
        std::cout << "Name: " << name << ", Age: " << age << std::endl;
    }
};

int main() {
    Person p1;
    p1.name = "Alice";
    p1.age = 25;
    p1.displayInfo();

    return 0;
}

In the above example, we defined a simple Person class and created a Person objectp1, and finally called The displayInfo function outputs information.

In general, although the C language and C have some differences, they are still very similar in many ways, which makes it easier for developers who learn and use both programming languages ​​to switch and adapt. Hopefully the code examples provided in this article will help readers better understand the similarities between the C language and C.

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