hello.c
#include <stdio.h>
int main()
{
        age = 15;
        height = 162;
        weight = 82.5;
        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;   
}