What are argc and argv in C

In C, this is used to provide information about arguments.
where argc is the argument counter represents the number of arguments
argv is argument vector represents a list (array) of multiple arguments, so it is [] .
These parameters are of type string, so they are of type char pointers.

argv[0] the full pathname when the program runs.
argv[1] represents the first parameter.

for example

hello.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char const *argv[]) {
	printf("The number of parameters：%d\n",argc);
	printf("Program path：%s\n",argv[0]);
	printf("the first parameter：%s\n",argv[1]);
    return 0;
}

run it：

C:\Users\Administrator> cd C:\
C:> hello.exe lautturi

The number of parameters：2
Program path：C:\hello.exe
the first parameter：lautturi