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14 BASIC EXERCISES FOR THE ATARI Now we will go once around the loop. 7 shows how the contents of X change as a function of I. --. We compa re A(2) to X and X is large r. -- . Sin ce A(3) is larger than X we store A3 in X. --. --. 4 - 7 is smaller th an 4 . 6 6 is larger than X so we copy 6 int o X. J We observe that by using this method, X is indeed being converted into the largest element of the array. Therefore, we can go ahead and program this flowchart. Note: This method can only be used with fairly simple flowcharts.
The solutions given for the exercises presented here are valid for "standard" BASIC interpreters. Most of the words and symbols in all BASIC interpreters are the same, although there are exceptions. Various computer manufacturers may vary a particular instruction or symbol. Some BASIC interpreters may include features not available in other interpreters. For example, it is now becoming common practice for some BASIC interpreters to accept "true" integers: A %, B% . ) The % tells the BASIC interpreter to store and treat this variable as a computer integer (usually 16 bits), rather than a "floating point" number, which is encoded in 32 bits.
By assigning L a value of 0 at the beginning of the program, we will avoid printing the plus sign (+) in front of the first fraction that is found. Subsequently, the variable is set to 1, and the output of each following fraction is preceded with a plus sign. Comments on the program : The precision with which a number may be represented is fixed for any given computer. The maximum integer number possible in a computer is a constant. The program should include a parameter mechanism that can be used to protect the integrity of the output.