If a single value structure or array structure may be used for a particular operand, a small window will appear asking for clarification for which structure should be used. If the array structure is used, a new window will appear that will assist in choosing the correct array element index. The range of possible indices numbers from 0 to s-1, where s is the size of the array. Two types of an array element index are available-data object and number. The data object is actually the name of an integer-typed data object or register that can correspond to an array element index. If the programmer selects this option, it is the responsibility of the programmer to assure that the value of this data object will correspond to a valid array element index for the data object during the running of the program; otherwise, a runtime error will occur. If the programmer selects the number option, the programmer will move a slider to the desired value for the array element index.