Southampton BASIC System: Difference between revisions

Revision as of 14:32, 18 May 2009

Revision as of 14:44, 18 May 2009

Line 36:

| Halt execution of the program.

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| <code>GOSUBFOR ''var''=''start'' TO ''end'' [STEP ''incr'']</code>

| Perform a set of statements repeatedly for varying values of ''var''

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| <code>GOSUB ''line''</code>

| Call a subroutine at a given line number; flow would return to the next statement when a <code>RETURN</code> was executed.

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| <code>GOTO ''line''</code>

| Unconditional branch to a given line number.

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| <code>IF... ''expr'' THEN... ''line'' [ELSE ''line'']</code>

| Conditionally branch. The <code>THEN</code> and <code>ELSE</code> parts could only give line numbers to go to.

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| <code>INPUT ''var''</code>

| Prompt the user for input data

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| <code>LET ''var''=''expr''</code>

| Assign a value to a variable. Unlike many modern dialects of BASIC, <code>LET</code> not an optional word.

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| <code>NEXT ''var''</code>

| Perform the next iteration of a <code>FOR</code> loop.

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| <code>PRINT</code>

| Output to the teletype

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| <code>READ ''var''...</code>

| Read data from <code>DATA</code> statements into variables

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Line 60 ⟶ 66:

| Short for <code>REM</code>ark, this allowed for a comment to be placed on a line

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| <code>RESTORE [''line'']</code>

| Reset the <code>READ</code> pointer in order to re-read <code>DATA</code>

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