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  1. #include <stdio.h>
  2.  
  3. void printSizes(int a[3][3], int (*p)[3])
  4. {
  5.   puts("when a and p passed to a function:");
  6.   printf("sizeof a: %u\n", (unsigned)sizeof a);
  7.   printf("sizeof p: %u\n", (unsigned)sizeof p);
  8. }
  9.  
  10. int main()
  11. {
  12.   int a[3][3] = {{10,20,30},{40,50,60},{70,80,90}};
  13.   int (*p)[3] = { a + 0, a + 1, a + 2 };
  14.   printf("sizeof a: %u\n", (unsigned)sizeof a);
  15.   printf("sizeof a[0]: %u\n", (unsigned)sizeof a[0]);
  16.   printf("sizeof a[0][0]: %u\n", (unsigned)sizeof a[0][0]);
  17.   printf("sizeof p: %u\n", (unsigned)sizeof p);
  18.   printf("sizeof p[0]: %u\n", (unsigned)sizeof p[0]);
  19.   printf("sizeof p[0][0]: %u\n", (unsigned)sizeof p[0][0]);
  20.   printSizes(a, p);
  21.   return 0;
  22. }
  23.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
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Standard input is empty
stdout
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sizeof a: 36
sizeof a[0]: 12
sizeof a[0][0]: 4
sizeof p: 8
sizeof p[0]: 12
sizeof p[0][0]: 4
when a and p passed to a function:
sizeof a: 8
sizeof p: 8
https://ideone.com/pg0XZC
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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