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  1. #include <stdio.h>
  2. int main()
  3. {
  4. float Pi=3.14, area, circumference, radius;
  5.  
  6.  
  7. printf("Enter radius of circle: ");
  8. scanf("%f",&radius);
  9.  
  10. area = Pi * radius * radius;
  11. printf("Area of circle is: %f\n",area);
  12.  
  13. circumference = 2 * Pi * radius;
  14. printf("Circumference of circle is: %f",circumference);
  15.  
  16. return 0;
  17. }
Success #stdin #stdout 0s 5264KB
stdin
25
stdout
Enter radius of circle: Area of circle is: 1962.500000
Circumference of circle is: 157.000000