Issues with the use of indexes with indexed variables in the D language

to anyone who can help. I am a beginner in the D language. I am facing an index violation issue that I am unable to resolve. The logic of the program seems to be correct, as something similar in C and C++ works (I have already tested it).

Here is the code:

import std.stdio;

void main()
{
    float[8][4] NOTAS;
    int I, J;

    writeln("2D ARRAY - INPUT AND OUTPUT\n");

    for (I = 0; I < 8; I++)
    {
        writefln("Enter grades for student %d:", I + 1);
        for (J = 0; J < 4; J++)
        {
            writef("Grade ==> %d: ", J + 1);
            readf(" %f", &NOTAS[I][J]);
        }
        writeln();
    }

    writeln("\nGRADE REPORT\n");
    writeln("Student Grade1 Grade2 Grade3 Grade4");
    writeln("------- ------ ------ ------ ------");

    for (I = 0; I < 8; I++)
    {
        writef("%7d", I + 1);
        for (J = 0; J < 4; J++)
        {
            writef("%7.1f", NOTAS[I][J]);
        }
        writeln();
    }
}

Here are the steps of the program's operation and the error message encountered:

2D ARRAY - INPUT AND OUTPUT

Enter grades for student 1:
Grade ==> 1: 1
Grade ==> 2: 1
Grade ==> 3: 1
Grade ==> 4: 1

Enter grades for student 2:
Grade ==> 1: 2
Grade ==> 2: 2
Grade ==> 3: 2
Grade ==> 4: 2

Enter grades for student 3:
Grade ==> 1: 3
Grade ==> 2: 3
Grade ==> 3: 3
Grade ==> 4: 3

Enter grades for student 4:
Grade ==> 1: 4
Grade ==> 2: 4
Grade ==> 3: 4
Grade ==> 4: 4

Enter grades for student 5:
[email protected](16): Range violation
----------------
??:? onRangeError [0x45cbb9]
/home/runner/TreasuredThoughtfulAssembler/main.d:16 _Dmain [0x4150dd]
Grade ==> 1: exit status 1


Has anyone experienced this before and can share their insights? Thank you in advance.

Note: I am running tests on Replit.

I have already tried changing the loop flow from "I = 0; I < 8; I++" to "I = 0; I <= 7; I++". I have also tried changing the dimension of the variable NOTAS from "[8][4]" to "[9][5]", but nothing has had any effect. The impression I got is that the variable "I" progresses from 0 to 4, and when it reaches 5, it violates the index of NOTAS.

Solution

C does arrays of arrays in a bizarre way, where use mirrors declaration. D always does it in a consistent order: int[5] x; is a 5-length array of ints, and int[5][4] is a 4-length array of 5-length arrays of ints.

As such, the use in C is reversed compared to the use in D.

C: int a[5][4]; max index: a[4][3]; D: int[5][4]; max index: a[3][4];