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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stddef.h>
  4.  
  5. struct my_type_t {
  6.     int x;
  7.     int y;
  8.     int z;
  9. };
  10.  
  11. struct my_array_t {
  12.     struct my_type_t test;
  13.     int otherstuff;
  14. };
  15.  
  16. void somefunction(struct my_array_t *arrayofstructs, size_t offset, int value) {
  17.     int i;
  18.     for (i = 0; i < 5; i++) {
  19.         //Unfortunatly can't do straight assignment not a lvalue
  20.         //if you just want to use the member as a rvalue (basically not assignment) can do so normally
  21.         memcpy((((void *)&arrayofstructs[i].test) + offset), &value, sizeof(value));
  22.     }
  23. }
  24. int main(void) {
  25.     struct my_array_t arrayofstructs[5];
  26.     somefunction(arrayofstructs, offsetof(struct my_type_t, x), 1);
  27.     somefunction(arrayofstructs, offsetof(struct my_type_t, y), 2);
  28.     somefunction(arrayofstructs, offsetof(struct my_type_t, z), 3);
  29.  
  30.     int i;
  31.     for(i = 0; i<5; i++) {
  32.         printf("Struct %d: X = %d, Y = %d, Z = %d\n",i,arrayofstructs[i].test.x \
  33.                                                       ,arrayofstructs[i].test.y \ 
  34.                                                       ,arrayofstructs[i].test.z);
  35.     }
  36.  
  37.     return 0;
  38. }
  39.  
  40.  
Success #stdin #stdout 0s 1832KB
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stdin
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Standard input is empty
stdout
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Struct 0: X = 1, Y = 2, Z = 3
Struct 1: X = 1, Y = 2, Z = 3
Struct 2: X = 1, Y = 2, Z = 3
Struct 3: X = 1, Y = 2, Z = 3
Struct 4: X = 1, Y = 2, Z = 3
https://ideone.com/9aDo2c
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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