#include <stdio.h>
int main()
{
int a;
char b;
float c;
double d;
a=320;
b='X';
c=3.14;
d=3.141592653;
printf("谢家豪的生日是%d\n",a);
printf("谢的首字母%c\n",b);
printf("圆周率是;%.2f\n",c);
printf("精确到小数点后九位的圆周率是%11.9f\n",d);
return 0;
}