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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct thing {
  5.     int part1;
  6.     double *part2;
  7. };
  8.  
  9. struct thing *setValue (struct thing *t, int pos, double set){
  10.     if (t->part1 < pos){ // check to see if array is large enough
  11.         t->part2 = realloc (t->part2, (pos+1) * sizeof(double)); /* assume no error */
  12.         for (int a = t->part1 + 1; a < pos + 1; a++)
  13.             t->part2[a] = 0;
  14.         t->part1 = pos;
  15.     }
  16.     t->part2[pos] = set; // ALWAYS stores an integer, don't know why
  17.     return t;
  18. }
  19.  
  20. int main(void) {
  21.   struct thing *abc;
  22.   abc = malloc(sizeof(struct thing)); /* assume no error */
  23.   abc->part1 = 0;
  24.   abc->part2 = malloc(sizeof(double)); /* assume no error */
  25.   setValue(abc, 42, 4.2);
  26.   setValue(abc, 4, -0.04);
  27.   printf("abc's values: %f and %f\n", abc->part2[4], abc->part2[42]);
  28.   return 0;
  29. }
Success #stdin #stdout 0.02s 1808KB
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stdin
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Standard input is empty
stdout
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abc's values: -0.040000 and 4.200000
https://ideone.com/VPDK2i
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
secret

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