Write a single program that will compute the value of a function where the independent variable is some random input value.

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Write a single program that will compute the value of a function where the independent variable is some random input value.

1. In order to randomly generate integer values in Assembler we need to use two procedures just as in C++. We first initialize the seed with randomize which does not take any parameters. It is important to understand that this procedure must only be called once in a program otherwise the values generated will not be random.

Be Careful!, Never put the call to randomize inside a loop or another procedure.

 

2. The procedure named randomrange is the one which generates the numbers. Register EAX must be set to a number. The procedure will generate a number between 0 and EAX minus 1 and return it in register EAX. You may have to add and/or subtract values from EAX to get the correct range.

3. Use randomrange to generate a value for x from – 8 to +12.

 

4. Based on the value of x, calculate the value of the function: ƒ(𝑥) = −𝑥3 + 14𝑥 − 3. Test your program with the 20 random values from – 8 to +12. Make sure to use the imul, multiplication instruction to evaluate 14𝑥. The output message must be of the form:

f(#) = #

5. Put your program in a loop to generate 20 different values of x and calculate f(x). In order to put the code in a loop use the loop instruction. This instruction must be used only with register ECX and no other register.

Note: (1) As long as ECX is not zero it continues to loop back to the label Lp1. The loop instruction decreases ECX automatically each time it is executed. (2) The naming convention for labels in Assembler follows the same rules as for regular variables.

 

mov ecx, 20 ; ECX set to 20: It will Loop 20 times.

Lp1: ; ----------- ; Label to branch back until ECX = 0

; your code ; Each time ECX is decreased by 1 until 0.

; ;

loop Lp1 ; Lp1 is a label to jump back to.

 

6. Expected output for the possible values required:

 

f(-8) = 397 f(-2)= -23 f(4) = -11 f(10) = -863

f(-7) = 242 f(-1)= -16 f(5) = -58 f(11) = -1180

f(-6) = 129 f(0) = -3 f(6) = -135 f(12) = -1563

f(-5) = 52 f(1) = 10 f(7) = -248

f(-4) = 5 f(2) = 17 f(8) = -403

f(-3) = -18 f(3) = 12 f(9) = -606

 

Note: Read the Blackboard file Lab Grading Criteria

 

 

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