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  1. #include<math.h>
  2. #define p(a) pow(a,1./a)
  3.  
  4. #include <stdio.h>
  5.  
  6. int main(void) {
  7. printf("%f",p(5));
  8. return 0;
  9. }
  10.  
Success #stdin #stdout 0s 5328KB
stdin
Standard input is empty
stdout
1.379730