求助：编程报错invalid operands of types 'float' and 'int' to binary 'operator^'

凯风自北来

之前编程的时候几个量都是整型的，后来为精确起见改成浮点型，但是就报错了，请大神帮忙看下问题在哪里
arduino IDE提示
_1.ino: In function 'void setup()':
_1:18: error: invalid operands of types 'float' and 'int' to binary 'operator^'
_1:20: error: invalid operands of types 'float' and 'int' to binary 'operator^'
invalid operands of types 'float' and 'int' to binary 'operator^'

1. #include <AccelStepper.h>
   
2. AccelStepper stepper1(1, 9, 8);
   
3. AccelStepper stepper2(1, 7, 6);
   
4. float  flowrate1=17;            
   
5. float  diameter1=8.24;            
   
6. int  pitch1=1;                  
   
7. float area1;                       
   
8. float velocity1;   
   
9. float  flowrate2=17;              
   
10. float diameter2=8.24;            
    
11. int  pitch2=1;                  
    
12. float area2;                     
    
13. float velocity2;
    
14. int pos1 = 3600;
    
15. int pos2 = 5678;
    
16. void setup()
    
17. {  
    
18.    area1=3.14*((diameter1/2)^2);   
    
19.    velocity1=(flowrate1/area1)*80/3;
    
20.     area2=3.14*((diameter2/2)^2);   
    
21.    velocity2=(flowrate2/area2)*80/3;
    
22.    stepper1.setMaxSpeed(velocity1);
    
23.    stepper1.setAcceleration(1000);
    
24.    stepper2.setMaxSpeed(velocity2);
    
25.    stepper2.setAcceleration(1000);}
    
26. void loop()
    
27. {
    
28.    if (stepper1.distanceToGo() == 0)
    
29.    {
    
30.      pos1 = -pos1;
    
31.      stepper1.moveTo(pos1);
    
32.    }
    
33.    if (stepper2.distanceToGo() == 0)
    
34.    {   
    
35.      pos2 = -pos2;
    
36.      stepper2.moveTo(pos2);
    
37.    }
    
38.     stepper1.run();
    
39.   stepper2.run();
    
40. }
    
41.    

复制代码

alai2015

int 跟 float不支持"^" 運算
換成下面方式試試:
#include <math.h>
...
area1=3.14*(pow((diameter1/2), 2));

凯风自北来

alai2015 发表于 2015-7-8 13:02
int 跟 float不支持"^" 運算
換成下面方式試試:
#include

多谢，问题已解决