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  1. #include <stdio.h>
  2.  
  3. void invert(double *a, int n) {
  4.  double *p=a;
  5.  double *q=a+n-1;
  6.  double tmp;
  7.  
  8.  while (p<q) {
  9.   tmp=*p;
  10.   *p=*q;
  11.   *q=tmp;
  12.  
  13.   p++;
  14.   q--;
  15.  }
  16. }
  17.  
  18. int main(void) {
  19.  int i;
  20.  double a[] = {1.0,2.0,3.0};
  21.  invert(a,3);
  22.  for (i=0;i<3;i++) {
  23.   printf("%lf",a[i]);
  24.  }
  25.  printf("\n");
  26.  return 0;
  27. }
  28.  
Success #stdin #stdout 0s 5316KB
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stdin
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Standard input is empty
stdout
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3.0000002.0000001.000000
https://ideone.com/1FcUie
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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