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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 />
double r=0.0;<br />
double m=2.0;<br />
double area=1;<br />
printf("enter area");<br />
area =PI* pow(r,m);<br />