昨天写了一个代码，使用C语言画三角形，既然写了那个，那就继续画一条直线，这个也很有意思。
C语言不调用库函数画一个三角形
直线的方程是
如下图所示
— — 斜率的范围
(-∞,+∞)
既然知道公式了，我们就直接上代码吧，之前有人评论说 putchar函数可以修改下，这次我们就修改下。
还有，我这次就不用浮点型了，直接用int来做计算。
#include "stdio.h"
typedef struct {
int x,y;
} Vec;
/*y=kx+b*/
int judge(Vec p,int k,int b){
int tmp = p.y - k*p.x -b;
if(tmp == 0)
return 1;
return 0;
}
int main(){
Vec p;
int k = 1;
int b = 16;
for(p.y = 50;p.y>= -50;p.y -=2,putchar('\n'))
for(p.x = -50;p.x <= 50;p.x++)
putchar(judge(p,k,b)?'@':'.');
}
用图片来更直观的来感受下输出
如果坐标系更大，就会更细腻
—— 程序输出
weiqifa@bsp-ubuntu1804:~/c$ gcc elsfk.c && ./a.out
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