argc & argv

1. English Explanation

argc

• Stands for: Argument Count
• Meaning: The number of command-line arguments passed to the program.
• Type: int (integer)
• Note: argc is at least 1, because the program name itself counts as the first argument.

argv

• Stands for: Argument Vector
• Meaning: An array of strings that stores all command-line arguments.
• Type: char *argv[] (or char **argv)
• argv[0] = the program name
• argv[1], argv[2]... = the actual arguments you input.

Simple Rule

argc = how many arguments; argv = what the arguments are.

---

2. 中文解释

argc

• 全称：Argument Count
• 含义：命令行参数的个数
• 类型：整数 int
• 特点：至少是 1，因为程序名本身也算一个参数。

argv

• 全称：Argument Vector
• 含义：存储所有命令行参数 的字符串数组
• 类型：char *argv[]
• argv[0] = 程序名
• argv[1]、argv[2]... = 你输入的实际参数

简单记忆

argc = 有几个参数；argv = 参数具体是什么。

---

3. Code Example (Standard main function)

#include <stdio.h>

// The full main function with command line arguments
int main(int argc, char *argv[])
{
    // Print how many arguments
    printf("Total arguments (argc): %d\n", argc);

    // Print all arguments
    for (int i = 0; i < argc; i++)
    {
        printf("argv[%d] = %s\n", i, argv[i]);
    }

    return 0;
}

---

4. How to Run & Test

Compile:

gcc main.c -o myapp

Run with arguments:

./myapp hello 123 test

Output

Total arguments (argc): 4
argv[0] = ./myapp
argv[1] = hello
argv[2] = 123
argv[3] = test

---

5. Summary Table

Name	Full Name	Chinese	Meaning
argc	Argument Count	参数个数	命令行参数的总数量（整数）
argv	Argument Vector	参数向量	存储所有参数的字符串数组

---

最直白总结

• argc = 你在终端输了几个词（包括程序名）
• argv = 把你输的词存成字符串数组
• argv[0] 永远是程序自己的名字