c语言程序出现警告，[Warning] extended initializer lists only available with -std=c++11 or -std=gnu++11

#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 ponds?\n", name);
    scanf("%f", &weight);
    size = sizeof(name);
    letters = strlen (name);
    volume = weight / density;
    printf("Well, %s, your volume is %2.2f cubic feet.\n", name, volume);
    printf("Also, your first name name has %d letters, \n", letters);
    printf("and we have %d bytes to store it.\n", size);
    
    return 0;
 } 

出现警告，[Warning] extended initializer lists only available with -std=c++11 or -std=gnu++11
如何解决？

char name{40}; 语法错误？