33 lines
747 B
C
33 lines
747 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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// As we are using the function BEFORE it is actually written we need to provide the
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// prototype so that the compiler can verify we are calling it correctly
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void CalculateArea ( double Radius, double *pArea); // note the ‘*’
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// This is the main code for our application
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int main()
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{
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double radius, area;
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radius = 1.0;
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CalculateArea (radius, &area);
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printf ("The area of circle of radius %f is %f\n", radius, area);
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return 0;
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}
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// And here is our function
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// Note: Pi is written out simply to match the notes, M_PI could also be used
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void CalculateArea ( double Radius, double *pArea )
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{
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*pArea = 3.14159265 * Radius * Radius;
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return;
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}
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