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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. // your code goes here
  5. double r;
  6. scanf("%lf",&r);
  7. printf("r=%lf\n",r);
  8. return 0;
  9. }
  10.  
Success #stdin #stdout 0s 5320KB
stdin
3.1415926
stdout
r=3.141593