C语言 为什么以下函数 输出结果不同

#include “stdio.h”
#include “math.h”
main()
{
float y;
int x,n;
y=1;
while(y>=-1)
{

n=acos(y)*10;
for(x=0;x<n;x++)
printf(” “);
printf(“*”);
for(;x<62-n;x++)
printf(” “);
printf(“*%d %lf\n”,n,y);
y=y-0.1;
}

getchar();
}




#include “stdio.h”
#include “math.h”
main()
{
double y;
int x,n;
y=1;
while(y>=-1)
{

n=acos(y)*10;
for(x=0;x<n;x++)
printf(” “);
printf(“*”);
for(;x<62-n;x++)
printf(” “);
printf(“*%d %lf\n”,n,y);
y=y-0.1;
}

getchar();
}