Discussion
Which of the following statements are correct about the program below?
#include <stdio.h>
int main()
{
int size, i;
scanf("%d", &size);
int arr[size];
for(i=1; i<=size; i++)
{
scanf("%d", arr[i]);
printf("%d", arr[i]);
}
return 0;
}
Answer: C
Correct answer: The code is erroneous since the statement declaring array is invalid
int arr[size]; is placed after an executable statement and sizes the array from a variable read at run time. Under the C89 rules this question is set against, both are illegal: declarations must precede statements in a block, and an array bound must be a compile-time constant. (C99 added variable-length arrays, which is why some modern compilers accept it.) There is a second bug worth noticing - scanf("%d", arr[i]) passes a value where an address is required - but the declaration is what the question is about.
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