return 0;是干吗用的

如题

#include <stdio.h>

int main()

{

    int age = 15;

    int height = 162;

    double weight = 82.5;

    char isfat = 'y';

    printf("年龄：%d 岁\n", age);

    printf("身高：%d CM\n", height);

    printf("体重：%f KG\n", weight);

    printf("是否属于肥胖儿童：%c\n", isfat); 

    /*%d,%f,%c此类符号在后面会有讲解*/

    return 0;    

}