C language: the function returns the realization of the output through the parameter

The blogger has just learned C language for a while, and he is not very proficient in the way of returning functions as parameters, so this small experiment is recorded.
code show as below:

/******************************************
*功能：实例了函数返回通过参数输出的实现
*作者：lml   时间：2020年4月12日18点
******************************************/
#include<stdio.h>
#include <stdlib.h>
//做两个形参，buf为输入参数，val为输出参数
int func(char *buf,int *val)
{
    
    
	char *arr;
	arr = buf;
	*val = atoi(arr);
	return 0;
}
int main(int argc, const char *argv[])
{
    
    
	char buf[10]={
    
    "123"};
	int data=0;
	func(buf,&data);
	printf("%d\n",data);
	return 0;
}

Finish.