Download Mastering Computer Programming by P. E. Gosling (auth.) PDF

By P. E. Gosling (auth.)

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This gives sufficient information to the program for the appropriate rows and columns of the league table to be amended. The fifth column contains the number of goals scored by the teams so that element 6,5 will contain the number of goals scored by team number 6. 4 STRINGS The final topic in this chapter refers to the ability of BASIC to handle strings of characters, denoted in BASIC by the $ sign after the variable name. A string variable is written, for example, as F$, Nl$, T2$ and so on. The contents of a string variable are distinguished from other variables in that they are enclosed in quotation marks, just as literals are in PRINT statements.

A single line number will cause the deletion of the line with that number. The replacement of one line with another is simply done by keying in a new line with the same line number as that to be replaced. The reason why we tend to use line numbers in steps of 10 is because additional lines can be inserted in a program by using a line number between the line numbers where the insertion is to be made. For example, if a line numbered 15 was keyed in then it would automatically take its place between lines 10 and 20, assuming there were no other lines there.

2 properly the user would have to count the number of items to be processed before the program is run. Computer people are notoriously bad at arithmetic! Fig. 3 uses a "trigger", in this case a rogue value of X which is -1. The value -1 has no special significance, any number which does not exist in the rest of the list will do. Other common numbers used as triggers are 0, 999, 9999 and so on. 3 WHILE/WEND The example shown in Fig. 4 shows an alternative way of writing the program should you know how many numbers are being averaged.

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