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// Get the variable name. getToken(); vname = token.charAt(0); if(!Character.isLetter(vname)) { handleErr(NOTVAR); return; } // Convert to index into variable table. var = (int) Character.toUpperCase(vname) - 'A'; // Get the equal sign. getToken(); if(!token.equals("=")) { handleErr(EQUALEXPECTED); return; } // Get the value to assign. value = evaluate(); // Assign the value. vars[var] = value; }
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The first thing assignment( ) does is read a token from the program. This will be the variable that will have its value assigned. If it is not a valid variable, an error will be reported. Next, the equal sign is read. Then, evaluate( ) is called to obtain the value to assign to the variable. Finally, the value is assigned to the variable. The method is surprisingly simple and uncluttered because the expression parser and the getToken( ) method do much of the messy work.
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The PRINT Statement
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In BASIC, the PRINT statement is actually quite powerful and flexible. While it is beyond the scope of this chapter to create a method that supports all the functionality of the PRINT statement, the one defined by Small BASIC supports its most important features. The general form of the PRINT statement is PRINT arg-list where arg-list is a comma- or semicolon-separated list of expressions or quoted strings. The print( ) method, shown here, interprets the PRINT statement:
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// Execute a simple version of the PRINT statement. private void print() throws InterpreterException
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3: Implementing Language Interpreters in Java
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{ double result; int len=0, spaces; String lastDelim = ""; do { getToken(); // get next list item if(kwToken==EOL || token.equals(EOP)) break; if(tokType==QUOTEDSTR) { // is string System.out.print(token); len += token.length(); getToken(); } else { // is expression putBack(); result = evaluate(); getToken(); System.out.print(result); // Add length of output to running total. Double t = new Double(result); len += t.toString().length(); // save length } lastDelim = token; // If comma, move to next tab stop. if(lastDelim.equals(",")) { // compute number of spaces to move to next tab spaces = 8 - (len % 8); len += spaces; // add in the tabbing position while(spaces != 0) { System.out.print(" "); spaces--; } } else if(token.equals(";")) { System.out.print(" "); len++; } else if(kwToken != EOL && !token.equals(EOP)) handleErr(SYNTAX); } while (lastDelim.equals(";") || lastDelim.equals(",")); if(kwToken==EOL || token.equals(EOP)) {
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if(!lastDelim.equals(";") && !lastDelim.equals(",")) System.out.println(); } else handleErr(SYNTAX); }
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The PRINT statement can be used to print a list of variables and quoted strings on the screen. If one item is separated from the next by a semicolon, then one space is printed between them. If two items are separated by a comma, then the second item will be displayed beginning with the next tab position. If the list ends in a comma or semicolon, then no newline is issued. Here are some examples of valid PRINT statements:
PRINT X; Y; "THIS IS A STRING" PRINT 10 / 4 PRINT
The last example simply prints a new line. The operation of print( ) is straightforward. However, notice that print( ) makes use of the putBack( ) method to return a token to the input stream. The reason for this is that print( ) must look ahead to see whether the next item to be printed is a quoted string or a numeric expression. If it is an expression, then the first term in the expression must be returned to the input stream so that the expression parser can correctly compute the value of the expression.
The INPUT Statement
In BASIC, the INPUT statement is used to read a value from the keyboard and assign that value to a variable. It has two general forms. The first is INPUT var which displays a question mark and waits for input. The second is INPUT "prompt-string", var which displays a prompting message and waits for input. In both cases, the value entered by the user is stored in var. For example,
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