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  1. #include <stdio.h>
  2.  
  3. #define my_sizeof(type) ((char *)(&type + 1) - (char *)(&type))
  4.  
  5. int main() {
  6.     int a;
  7.     double b;
  8.     char c;
  9.  
  10.     printf("Size of int: %zu bytes\n", my_sizeof(a));
  11.     printf("Size of double: %zu bytes\n", my_sizeof(b));
  12.     printf("Size of char: %zu bytes\n", my_sizeof(c));
  13.  
  14.     return 0;
  15. }
  16.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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45
stdout
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Size of int: 4 bytes
Size of double: 8 bytes
Size of char: 1 bytes
https://ideone.com/KT99pk
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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