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Write a program that randomly chooses between three different colors for displaying text on the screen. Use a loop to display twenty lines of text, each with a randomly chosen color. The probabilities for each color are to be as follows: white = 30%, blue = 10%, green = 60%. Hint: generate a random integer between 0 and 9. If the resulting integer is in the range 0-2, choose white. If the integer equals 3, choose blue. If the integer is in the range 4-9, choose green.

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Answer:

INCLUDE Irvine32.inc

.data

msgIntro  byte "This is Your Name's fourth assembly extra credit program. Will randomly",0dh,0ah

         byte "choose between three different colors for displaying twenty lines of text,",0dh,0ah

         byte "each with a randomly chosen color. The color probabilities are as follows:",0dh,0ah

         byte "White=30%,Blue=10%,Green=60%.",0dh,0ah,0

msgOutput byte "Text printed with one of 3 randomly chosen colors",0

.code

main PROC

;

//Intro Message

       mov edx,OFFSET msgIntro  ;intro message into edx

       call WriteString         ;display msgIntro

       call Crlf                ;endl

       call WaitMsg             ;pause message

       call Clrscr              ;clear screen

       call Randomize           ;seed the random number generator

       mov edx, OFFSET msgOutput;line of text

       mov ecx, 20              ;counter (lines of text)

       L1:;//(Loop - Display Text 20 Times)

       call setRanColor         ;calls random color procedure

       call SetTextColor        ;calls the SetTextColor from library

       call WriteString         ;display line of text

       call Crlf                ;endl

       loop L1

exit

main ENDP

;--

setRanColor PROC

;

; Selects a color with the following probabilities:

; White = 30%, Blue = 10%, Green = 60%.

; Receives: nothing

; Returns: EAX = color chosen

;--

       mov eax, 10              ;range of random numbers (0-9)

       call RandomRange         ;EAX = Random Number

       .IF eax >= 4          ;if number is 4-9 (60%)

       mov eax, green           ;set text green

       .ELSEIF eax == 3         ;if number is 3 (10%)

       mov eax, blue            ;set text blue

       .ELSE                    ;number is 0-2 (30%)

       mov eax, white           ;set text white

       .ENDIF                   ;end statement

       ret

setRanColor ENDP

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