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;
}

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