C语言程序报错，找不问题

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

#define DENSITY 62.4

int main(){
    float weight, volume;
    int size, letters;
    char name[40];

    printf("Hi! What's your first name?\n");
    scanf("%s", name);
    printf("%s, what's your weight in pounds?\n", name);
    scanf("%f", &weight);

    size = sizeof(name);
    letters = strlen(name);
    volume = weight / DENSITY;

    printf("Well, %s, your volume is %2.5f cubic feet.\n", name, volume);
    printf("Also, we have %d bytes to store your first name.\n", letters);
    printf("And we have %d bytes to store it.\n", size);

    return 0;
}