char a[MAX_NR_DIGITS] = {5, 2, 1, 3, 5, 0, 7, 3, 4, 4};
int sizeA = 10;
char n[MAX_NR_DIGITS] = {5, 2, 6};
int sizeN = 3;
It returns me twice the error: variable-sized object may not be initialized. How can i solve this?
1 Answer
In case those arrays are declared at local scope and MAX_NR_DIGITS is not a compile-time integer constant, C will attempt to create a variable-length array (VLA). This is an array which has its size determined during run-time.
The easiest way to avoid this is, if it was unintentional, is to make sure that MAX_NR_DIGITS is a compile-time constant such as #define MAX_NR_DIGITS 10.
The reason why the code doesn't work when the array is a VLA, is because initializer lists are only used during compile-time. Therefore the C language has a requirement saying that VLAs cannot be initialized.
For a VLA you can easily get around this by assigning the array a value in run-time instead:
memcpy(n, &(char[3]){5, 2, 6}, 3);
MAX_NR_DIGITS? Where do you get the errors? Can you please try to a Minimal, Complete, and Verifiable Example and show us? And include the full and complete and unedited error output when building?MAX_NR_DIGITSis not a constant. It's only a guess because you don't tell us whatMAX_NR_DIGITSis