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  1.  
  2.              #include <stdio.h>
  3.  
  4.              #define PI 3.14      /* define the value of PI as a constant */
  5.  
  6.              float square   (float number)
  7.              { 
  8.                       float square_value;
  9.  
  10.                       square_value = number * number;
  11.  
  12.                       return (square_value);
  13.  
  14.              }    
  15.  
  16.              float area_of_circle (float radius)
  17.              {
  18.  
  19.                       float area;   /* area of a circle */
  20.  
  21.                       /* compute area of a circle: PI * radius squared */
  22.                       area  = PI * square(radius);
  23.  
  24.                       return (area);
  25.              }
  26.  
  27.              main ()
  28.              {
  29.  
  30.                    float area;       /* the area of the circle */
  31.                    float radius;    /* radius of a circle to be entered */
  32.  
  33.                    printf ("Enter the circle radius: ");
  34.                    scanf ("%f", &radius);
  35.  
  36.                   /* Pass value1 to the square function, process it and return the */
  37.                   /* the squared value into the answer local variable */
  38.                   area = area_of_circle (radius);
  39.  
  40.                   printf ("The Area of a Circle with a radius of %5.2f is %10.2f \n", radius, area);
  41.  
  42.                  return (0);
  43.  
  44.              }
Success #stdin #stdout 0.01s 5280KB
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stdin
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4.5
stdout
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Enter the circle radius: The Area of a Circle with a radius of  4.50 is      63.58
https://ideone.com/iZXDPL
language:
C++ (gcc 8.3)
created:
3 hours ago
visibility:
public

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