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Variable-Length Arrays

Variable-Length Arrays

Learn how to create arrays of variable length without specifying the array size at compile time.

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In the array examples before, we have hard-coded the size of the array. In modern C, it’s possible to declare arrays without knowing their size until run time.

Here is how to do it:

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#include <stdio.h>
int main(void) {
    int n;
    // We discuss scanf later. For now, note that n holds the input integer.     
    scanf("%i", &n);
    printf("Entered length: %d\n", n);
    int grades[n];
    int i;
    for (i = 0; i < n; i++) {
      grades[i] = i;
      printf("grades[%d] = %d\n", i, grades[i]);
    }
    return 0;
}

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