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  1. #include <stdio.h>
  2. int main(){
  3. int radius;
  4. float pi=3.14;
  5. printf("Type radius of circle \n");
  6. scanf("%d", &radius);
  7. printf("Area of circle is %f \n", pi*radius*radius );
  8.  
  9. return 0;}
Success #stdin #stdout 0s 5688KB
stdin
3
stdout
Type radius of circle 
Area of circle is 28.260000