昨天寫了一個代碼，使用C語言畫三角形，既然寫了那個，那就繼續(xù)畫一條直線，這個也很有意思。

C語言不調(diào)用庫函數(shù)畫一個三角形

直線的方程是

如下圖所示

— — 斜率的范圍

(-∞,+∞)

既然知道公式了，我們就直接上代碼吧，之前有人評論說 putchar函數(shù)可以修改下，這次我們就修改下。

還有，我這次就不用浮點(diǎn)型了，直接用int來做計(jì)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)?'@':'.'); }

用圖片來更直觀的來感受下輸出

如果坐標(biāo)系更大，就會更細(xì)膩

—— 程序輸出

weiqifa@bsp-ubuntu1804:~/c$?gcc?elsfk.c?&&?./a.out ....................................................................................@................ ..................................................................................@.................. ................................................................................@.................... ..............................................................................@...................... ............................................................................@........................ ..........................................................................@.......................... ........................................................................@............................ ......................................................................@.............................. ....................................................................@................................ 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............@........................................................................................ ..........@.......................................................................................... ........@............................................................................................ ......@.............................................................................................. ....@................................................................................................ ..@.................................................................................................. @.................................................................................................... ..................................................................................................... ..................................................................................................... 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