运行后无论输什么值 都等于0

#include<stdio.h>
#include<math.h>
int main()
{
double x,s;
printf("input number:\n");
scanf("lf",&x);
s=sin(x);
printf("sin of %lf is %lf\n",x,s);
return 0;
}

scanf("%lf", &x);