invalid operands of types `float’ and `int’ to bin

[chucky]

I’m a beginner, so not too harsh on the criticism. Ok, so I have the code

<br /> void circle()<br /> {<br /> int r;<br /> double Area;<br /> cout << "Enter the radius: ";<br /> cin >> r;<br /> Area = PI * r^2;<br /> cout << "The area is " << Area << "n";<br /> main();<br /> }

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<br /> void circle()<br /> {<br /> int r;<br /> double Area;<br /> cout << "Enter the radius: ";<br /> cin >> r;<br /> Area = PI * r^2;<br /> cout << "The area is " << Area << "n";<br /> main();<br /> }

and i try to compile it and i get an error saying “38 invalid operands of types float’ and int’ to binary `operator^'”. What should I do?

[msaqib]

Hello
 
Well there is a sligh problem with your code. You are using ^ as a power operator but there is no such operator which performs the power operations. This operator (^) is a bitwiase operator to calculate XOR.

To calculate the power you can use pow(double x, double y) function. It will calculate x power y. 
 
Also make sure you include math.h header in your program as pow function is defined is this header file. 
 
So your function should look like

void circle()<br /> {<br />  double r=0.0;<br />  double m=2.0;<br />  double area=1;<br /> printf("enter area");<br />  scanf("%lf",&#038;r);<br />  area =PI* pow(r,m);<br />  printf("%lf",area);<br />  getch();<br /> }

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void circle()<br /> {<br />  double r=0.0;<br />  double m=2.0;<br />  double area=1;<br /> printf("enter area");<br />  scanf("%lf",&#038;r);<br />  area =PI* pow(r,m);<br />  printf("%lf",area);<br />  getch();<br /> }

[S.Thananchayan]

#include <iostream><br /> using namespace std;<br /> int main()<br /> {<br />     float pi = 3.14;<br />  int r;<br />     double area;<br />     cout << "Enter the radius: ";<br />     cin >> r;<br />     area =  r * r * pi;<br />     cout << "The area is "  << area << "n";<br />     return(0);<br />  <br /> }  </iostream>

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#include <iostream><br /> using namespace std;<br /> int main()<br /> {<br />     float pi = 3.14;<br />  int r;<br />     double area;<br />     cout << "Enter the radius: ";<br />     cin >> r;<br />     area =  r * r * pi;<br />     cout << "The area is "  << area << "n";<br />     return(0);<br />  <br /> }  </iostream>

 
 
   

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