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  1. #include <stdio.h>
  2. #define PI 3.14159
  3. int main(void){
  4. double r;
  5. scanf("%1f",&r);
  6. printf("circumference = %f\n",2*3.14159*r);
  7. printf("area = %f\n",3.14159*r*r);
  8. return 0;
  9. }
  10.  
Success #stdin #stdout 0s 5320KB
stdin
2
stdout
circumference = 0.000000
area = 0.000000