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  1. #include <stdio.h>
  2. #define PI 3.14
  3. struct Ellipse{
  4. int a;
  5. int b;
  6. }Date = {5,2};
  7. int main(void) {
  8. printf("%lf",PI*Date.a*Date.b);
  9.  
  10. return 0;
  11. }
  12.  
Success #stdin #stdout 0s 5280KB
stdin
Standard input is empty
stdout
31.400000