RosettaCodeData/Task/Function-definition/ANSI-BASIC/function-definition.basic

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100 DEF Multiply(A, B) = A * B
110 DECLARE FUNCTION MultiplyI
120 DECLARE EXTERNAL FUNCTION MultiplyE
130 PRINT Multiply(3, 1.23456)
140 PRINT MultiplyI(3, 1.23456)
150 PRINT MultiplyE(3, 1.23456)
160 FUNCTION MultiplyI(X, Y)
170 LET MultiplyI = X * Y
180 END FUNCTION
190 END
200 EXTERNAL FUNCTION MultiplyE(A, B)
210 LET MultiplyE = A * B
220 END FUNCTION