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Published byEzequiel Sorsby Modified about 1 year ago

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Arithmetic in Pascal (2) Arithmetic Functions

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Perform arithmetic calculations Gives an argument to the function and it returns the result

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Some Arithmetic Functions Pascal function Argument type Function type sqr(x)integer or realsame as argument sqrt(x)integer or realreal sin(x)integer or realreal cos(x)integer or realreal ln(x)integer or realreal exp(x)integer or realreal

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Some Arithmetic Functions Pascal function Argument type Function type random(x)integer abs(x)integer or realsame as argument round(x)realinteger trunc(x)realinteger

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sqr(x) Return the square of the argument The type of the result is the same as the argument D := sqr(2) D = 4

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sqrt(x) Return the square root of the argument The type of the result is always real The function type is real even when the result is a rounded number D := sqrt(9) D = 3.0

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sin(x), cos(x) Return the sine and cosine of the argument The type of the result is always real The argument should be in radians, not degree Use Degree * Pi / 180 to calculate the radians

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ln(x), exp(x) Return the value of ln and exp like the same function in your calculator The type of the result is always real X y := exp( y * ln(x) )

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random(x) Return a random number between 0 and the argument – 1 The type of the result is integer Exception When you use random with no argument, it returns a number of type real ranged from 0 to 1 (but not include 1)

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random(x) (cont.) Try to write a program to generate three random number Run the program for a few times Something strange !! Try to add a line randomize; before using random(x) This procedure randomize the random number generator

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abs(x) Return the absolute value (positive value) of the argument The type of the result is the same as the type of input argument

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round(x) Return the value of the argument rounded to the nearest integer The type of the result is always integer round(10.5) = 11 round(10.4) = 10 round(-10.5) = -11 round(-10.4) = -10

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trunc(x) Return the value of the argument rounded to the nearest integer towards zero Or we could say everything after the decimal point is truncated trunc(10.9) = 10 trunc(-10.9) = 10

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