data.c

int     data[4],            // Allocates an array of type int with 4 elements
        i;                  // Allocates an int
        
for(i = -8;                 // Initializes i to -8
    i < 10;                 
    i++)                    // Increments i by 1
    printf("%d\n", data[i]);// This will generate an error when i is in [-8, 0)u(3, 9]
    
// This ^ will iterate over the following values
// -8
// -7
// -6
// ...
// 7
// 8
// 9