小编blu*_*oid的帖子

我写了这段简单的代码(它实际上根据输入的s,c或t来计算x的正弦,余弦或正切值),这种方法很好,直到我试图改变语句的顺序......一个工作正常.....

#include<stdio.h>
#include<math.h>
void main()
{
char T;
float x;
printf("\nPress s or S for sin(x); c or C for cos(x); t or T for tan(x)\n\n");
scanf("%c", &T);
printf("Enter the value of x: ");
scanf("%f",&x);

if(T=='s'||T=='S')
{
    printf("sin(x) = %f", sin(x));
}
else if(T=='c'||T=='C')
{
    printf("cos(x) = %f", cos(x));
}
else if(T=='t'||T=='T')
{
    printf("tan(x) = %f", tan(x));
}
}

*但是*一旦我将排列更改为以下内容,编译器会询问x的值并跳过scanf for char T并且不返回任何内容......任何人都可以解释这里发生了什么？

#include<stdio.h>
#include<math.h>
void main()
{
char T;
float x;

printf("Enter the value of x: "); …

我是Processing的新手,我一直致力于模拟电子运动.在我尝试为每个粒子添加渐变颜色之前,一切似乎都很好.帧速率大幅下降.

这是我到目前为止所尝试的:

float a=0;
float s;
void setup()
{
  size(500,500);
  smooth();
  frameRate(500);
  colorMode(HSB,360,100,100);
  noStroke();
  ellipseMode(RADIUS);
}

void draw()
{
  background(200,0,100);
  pushMatrix();
  translate(width/2, height/2);
  rotate(radians(-18));
  for ( int r = width ; r >= 0; r = r - 1 )
  {
    s = 500*exp(-r);
    fill(202, s, 100);
    ellipse(100*cos(a), 50*sin(a), r, r);

  }
  a+=0.1;
  popMatrix();
}