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slowdeathslowdeath Posts: 1Member
can somebody help me in writing a 3d array in which the user defines the size and inputs the data(numbers)???


  • zibadianzibadian Posts: 6,349Member
    : can somebody help me in writing a 3d array in which the user defines the size and inputs the data(numbers)???
    Pascal doesn't allow dynamic arrays, so there will always be a maximum number of elements. Here is an example, which allows the user to specify up to 100x100x100 integers:
    UserArray: array[1..100, 1..100, 1..100] of integer;
    UserArraySize: array[1..3];
    X, Y, Z, i, j: integer;
    { Set Dimensions }
    write('Give X size: '); readln(UserArraySize[1]);
    until UserArraySize[1] in [1..100]; { Check the size. }
    write('Give Y size: '); readln(UserArraySize[2]);
    until UserArraySize[2] in [1..100]; { Check the size. }
    write('Give Z size: '); readln(UserArraySize[3]);
    until UserArraySize[3] in [1..100]; { Check the size. }
    writeln('Select an element to Enter:');
    write('X: '); read(X);
    until X in [1..UserArraySize[1]];
    write('Y: '); read(Y);
    until Y in [1..UserArraySize[2]];
    write('Z: '); read(Z);
    until Z in [1..UserArraySize[3]];
    write('Value for ',X,',',Y,',',Z,':'); readln(UserArray[X, Y, Z]);

    { Code to show 2D-slice of the array}
    for i := 1 to UserArraySize[2] do
    for j := 1 to UserArraySize[1] do
    write(UserArray[j, i, z]), ' ');
    There are various other ways to structure such an array. One commonly used method utilizes a 1D-array and calculates the 3D-coordinates to a 1D-coordinate. The main advantage is that the dimension-maximums aren't set, only the total number of elements.
    Other methods use linked-lists to build the array. The advantage of this is that the array becomes dynamic.
    These methods are increasingly harder to code and debug.
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