这个程序为啥运行后直接就结束了

Question

#include<stdio.h>
#include<string.h>
#define DENSITY 62.4
int main(void)
{
float weight, volume;
int size, letters;
char name[40];
printf("Hi! What's your frist name?\n");
scanf_s("%s", name);
printf("%s,Whats your weight in pounds?\n", name);
scanf_s("%f", &weight);
size = sizeof(name);
letters = strlen(name);
volume = weight / DENSITY;
printf("well,%s,your volume is %2.2f cubic feet.\n", name, weight);
printf("Also,your frist name has %d letters,\n", letters);
printf("and we have %d bytes to store it.\n", size);
return 0;

}

Answer 1

scanf_s("%s", name); 修改为： scanf_s("%s", name, 40);