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【
C
】
画y=sin(x)和y=x/3在[-pi/2,pi/2]的图像
作者:
Dezai.CN
/ 发布于
2011/7/8
/
757
<div> <strong><span style="color: #0000ff">程序2：画y=sin(x)和y=x/3在[-pi/2,pi/2]的图像</span></strong> <b>没有画出坐标，直接画图像的形状，采用坐标描点。分y>0和y<0两种情况，y>0时，y=x/3在y=sin(x)后面。y<0时相反</b> <span style="color: #0000ff" color="#0000ff">代码：</span> <div class="cnblogs_code"> <pre><div><span style="color: #008000">//</span><span style="color: #008000">程序2；</span><span style="color: #008000"></span><span style="color: #000000">#include</span><span style="color: #000000"><</span><span style="color: #000000">stdio.h</span><span style="color: #000000">></span><span style="color: #000000">#include</span><span style="color: #000000"><</span><span style="color: #000000">math.h</span><span style="color: #000000">></span><span style="color: #000000"></span><span style="color: #0000ff">int</span><span style="color: #000000"> main(){ </span><span style="color: #0000ff">double</span><span style="color: #000000"> y; </span><span style="color: #0000ff">int</span><span style="color: #000000"> x,m,k; </span><span style="color: #0000ff">for</span><span style="color: #000000">(y</span><span style="color: #000000">=</span><span style="color: #800080">1</span><span style="color: #000000">;y</span><span style="color: #000000">>=-</span><span style="color: #800080">1</span><span style="color: #000000">;y</span><span style="color: #000000">-=</span><span style="color: #800080">0.1</span><span style="color: #000000">) </span><span style="color: #008000">//</span><span style="color: #008000">y为列方向，值从1到-1，步长为0.1</span><span style="color: #008000"></span><span style="color: #000000"> { m</span><span style="color: #000000">=</span><span style="color: #000000">asin(y)</span><span style="color: #000000">*</span><span style="color: #800080">10</span><span style="color: #000000">; </span><span style="color: #008000">//</span><span style="color: #008000">计算出y对应的弧度m，乘以10为图形放大倍数</span><span style="color: #008000"></span><span style="color: #000000"> k</span><span style="color: #000000">=</span><span style="color: #800080">3</span><span style="color: #000000">*</span><span style="color: #000000">y</span><span style="color: #000000">*</span><span style="color: #800080">10</span><span style="color: #000000">; </span><span style="color: #008000">//</span><span style="color: #008000">计算y=x/3对应的x，同样将图形放大10倍</span><span style="color: #008000"></span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (y</span><span style="color: #000000">></span><span style="color: #800080">0</span><span style="color: #000000">)</span><span style="color: #008000">//</span><span style="color: #008000">[0,PI/2]</span><span style="color: #008000"></span><span style="color: #000000"> { </span><span style="color: #0000ff">for</span><span style="color: #000000">(x</span><span style="color: #000000">=</span><span style="color: #800080">1</span><span style="color: #000000">;x</span><span style="color: #000000"><</span><span style="color: #800080">31</span><span style="color: #000000">+</span><span style="color: #000000">m;x</span><span style="color: #000000">++</span><span style="color: #000000">) printf(</span><span style="color: #800000">"</span><span style="color: #800000"> </span><span style="color: #800000">"</span><span style="color: #000000">); printf(</span><span style="color: #800000">"</span><span style="color: #800000">*</span><span style="color: #800000">"</span><span style="color: #000000">); </span><span style="color: #0000ff">for</span><span style="color: #000000">(;x</span><span style="color: #000000"><</span><span style="color: #800080">31</span><span style="color: #000000">+</span><span style="color: #000000">k; x</span><span style="color: #000000">++</span><span style="color: #000000">) printf(</span><span style="color: #800000">"</span><span style="color: #800000"> </span><span style="color: #800000">"</span><span style="color: #000000">); printf(</span><span style="color: #800000">"</span><span style="color: #800000">*\n</span><span style="color: #800000">"</span><span style="color: #000000">); } </span><span style="color: #0000ff">else</span><span style="color: #008000">//</span><span style="color: #008000">[-PI/2,0]</span><span style="color: #008000"></span><span style="color: #000000"> { </span><span style="color: #0000ff">for</span><span style="color: #000000"> (x</span><span style="color: #000000">=</span><span style="color: #800080">1</span><span style="color: #000000">; x </span><span style="color: #000000"><</span><span style="color: #000000"> </span><span style="color: #800080">31</span><span style="color: #000000">+</span><span style="color: #000000">k;x</span><span style="color: #000000">++</span><span style="color: #000000">) printf(</span><span style="color: #800000">"</span><span style="color: #800000"> </span><span style="color: #800000">"</span><span style="color: #000000">); printf(</span><span style="color: #800000">"</span><span style="color: #800000">*</span><span style="color: #800000">"</span><span style="color: #000000">); </span><span style="color: #0000ff">for</span><span style="color: #000000">(;x</span><span style="color: #000000"><</span><span style="color: #800080">31</span><span style="color: #000000">+</span><span style="color: #000000">m;x</span><span style="color: #000000">++</span><span style="color: #000000">) printf(</span><span style="color: #800000">"</span><span style="color: #800000"> </span><span style="color: #800000">"</span><span style="color: #000000">); printf(</span><span style="color: #800000">"</span><span style="color: #800000">*\n</span><span style="color: #800000">"</span><span style="color: #000000">); } } </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #800080">0</span><span style="color: #000000">;}</span></div></pre> </div> 运行结果： <div class="cnblogs_code"> <pre><div><span style="color: #000000">[hanxi@hanxi</span><span style="color: #000000">-</span><span style="color: #000000">workstation Documents]$ gcc </span><span style="color: #000000">-</span><span style="color: #000000">lm code2.c[hanxi@hanxi</span><span style="color: #000000">-</span><span style="color: #000000">workstation Documents]$ .</span><span style="color: #000000">/</span><span style="color: #000000">a.</span><span style="color: #0000ff">out</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">**</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">*</span></div></pre> </div> </div>
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