How to write the basic format of C language code

The basic format of C language includes: preprocessing instructions (starting with a pound sign, including header files or defining macros); function declaration (specifying function information); global variable declaration (declaring variables available outside the function); function definition (contains the function body); main function (program entry point); statement (instructs the computer to perform operations).

Basic format of C language

The basic format of C language contains the following elements:

• Preprocessing directives: starts with a pound sign (#) and is used to include header files or define macros.
• Function declaration: Specifies the return type, function name and parameter list of the function.
• Global variable declaration: Declare variables available outside the function.
• Function definition: Contains function body and implementation.
• Main function (main): The entry point of the program.
• Statement: A line of code that instructs the computer to perform an operation.

Specific format:

<code class="c">#include <stdio.h> // 包含头文件

int main() { // 主函数
    int a, b; // 声明全局变量

    printf("输入两个数字："); // 提示用户输入
    scanf("%d %d", &a, &b); // 读取用户输入

    int sum = a + b; // 计算总和

    printf("总和为：%d\n", sum); // 输出结果

    return 0; // 结束程序
}</code>

Detailed explanation:

• Line 2 contains preprocessing instructions , giving programmers access to functions in the standard input/output (I/O) library.
• Line 4 is the main function, which is the first function executed when the program starts.
• Lines 6-7 declare two global variables a and b.
• Lines 9-10 use the printf function to prompt the user for input and the scanf function to read the input.
• Line 12 calculates the sum of the two input numbers and stores it in the variable sum.
• Lines 14-15 use the printf function to output the results to the console.
• Line 17 returns 0 to end the program.

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