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  1. #include <stdio.h>
  2. double mul(double x,double y);
  3. int main(void) {
  4. double x;
  5. double y;
  6. scanf("%lf",&y);
  7. scanf("%lf",&x);
  8. printf("x:%lf y:%lf",x,y);
  9. printf("x*y=%lf",mul(x,y));
  10. return 0;
  11. }
  12. double mul(double x,double y){
  13. return x*y;
  14. }
  15.  
Success #stdin #stdout 0.01s 5276KB
stdin
2
3
stdout
x:3.000000 y:2.000000x*y=6.000000