最后一行总是显示错误，有没有人能告诉我

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#define I 20
#define R 340
#include <string.h>
int main()
{
char answer[10];
printf("遇到你\n我才发现\n曾经所有的条件\n似乎都成了我等你的借口\n\n");
printf("请允许我，从今往后映入你\n明媚的眼\n");
printf("输入yes或no,点击Enter");
printf("\n ");
scanf("%s", answer);
char b[4]="yes";
if(strcmp(answer,b)==0)
{
float y, x, z, f;
for (y = 1.5f; y > -1.5f; y -= 0.1f)
{
for (x = -1.5f; x < 1.5f; x += 0.05f)
{
z = x * x + y * y - 1;
f = z * zz - x * xyyy;
putchar(f <= 0.0f ? "*********"[(int)(f*-8.0f)] : ' ');
}
putchar('\n');
}
long time;
for (;;)
{
system("color a");
for (time = 0; time<99999999; time++);
system("color b");
for (time = 0; time<99999999; time++);
system("color c");
for (time = 0; time<99999999; time++);
system("color d");
for (time = 0; time<99999999; time++);
system("color e");
for (time = 0; time<99999999; time++);
system("color f");
for (time = 0; time<99999999; time++);
system("color 0");
return 0；}
为什么最后一行总是显示错误啊

error：stray'\243'in program
错误原因：
出现非标ASCII的字符，比如全角的{，}，；
我们还少打了三个}
还有变量没有声明

下面这个去把zz和xyyy申明了应该就可以了，有不懂的欢迎随时来问

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#define I 20
#define R 340
#include <string.h>
int main()
{
char answer[10];
printf("遇到你\n我才发现\n曾经所有的条件\n似乎都成了我等你的借口\n\n");
printf("请允许我，从今往后映入你\n明媚的眼\n");
printf("输入yes或no,点击Enter");
printf("\n ");
scanf("%s", answer);
char b[4]="yes";
if(strcmp(answer,b)==0)
{
float y, x, z, f;
for (y = 1.5f; y > -1.5f; y -= 0.1f)
{
for (x = -1.5f; x < 1.5f; x += 0.05f)
{
z = x * x + y * y - 1;
f = z * zz - x * xyyy;

}
putchar('\n');
}
long time;
for (;;)
{
system("color a");
for (time = 0; time<99999999; time++);
system("color b");
for (time = 0; time<99999999; time++);
system("color c");
for (time = 0; time<99999999; time++);
system("color d");
for (time = 0; time<99999999; time++);
system("color e");
for (time = 0; time<99999999; time++);
system("color f");
for (time = 0; time<99999999; time++);
system("color 0");
return 0; 
}
}
}