9.1趣味图形

1>绘制余弦曲线

//绘制余弦曲线#include<math.h>int main ( int argc, char **argv ){    double y;    int x,m;    for (y=1; y>=-1; y-=0.1) {        m=acos(y)*10;        for (x=1;x<m;x++)            printf(" ");        printf("*");        for(;x<62-m;x++)            printf(" ");        printf("*\n");    }       return 0;}#endif

2>绘制空心圆

#if 0#include<math.h>int main ( int argc, char **argv ){    double y;    int x,m;    for (y=10; y>=-10; y--) {        m=2*sqrt(100-y*y);        for (x=1;x<30-m;x++)            printf(" ");        printf("*");        for(;x<30+m;x++)            printf(" ");        printf("*\n");    }    return 0;}