怎样用c语言画函数曲线图

#include<stdio.h>
#include<math.h>
main(){
double y;
int x,m,i;
printf("y=sin(x) [0<x<2*pi]\n");
for(y=1;y>=-1;y-=0.1){
if(y>=0){
 m=asin(y)*10;
 for(x=1;x<m;x++)printf(" ");
 printf("*",m);
 for(;x<31-m;x++)printf(" ");
 printf("*\n");}
else{
 m=-1*asin(y)*10;
for(i=0;i<32;i++)printf(" ");
 for(x=1;x<m;x++)printf(" ");
 printf("*",m); 
 for(;x<31-m;x++)printf(" ");
 printf("*\n",m);
}
}
}