CODEWITHSUNDEEP
cmicrocontrollerpic
Tenshiro
Tenshiro

Reputation: 11

Why doesn't give rand() no random values in PIC simulator IDE?

I used a PIC simulator IDE with PIC16F886 and random is always equal to 0 every time I run the code. It look like the rand() is not working. I can't understand what happened.

Here is the code:

#include <16F886.h>
#include <stdlib.h>
#include <time.h>
#include <stdio.h>

#FUSES NOWDT
#FUSES PUT
#FUSES NOMCLR
#FUSES NOPROTECT
#FUSES NOCPD
#FUSES BROWNOUT
#FUSES IESO
#FUSES FCMEN
#FUSES NOLVP
#FUSES NODEBUG
#FUSES NOWRT
#FUSES BORV40
#FUSES RESERVED
#FUSES INTRC_IO

#use delay(clock=8M)

#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)

void main()
{
    int myInput;
    int random;
    random = rand() % 5;
    printf("type a character\r\n");
    printf(" %d ", random);
    while(1) {
        myInput = getc();
        printf("You typed - %d\r\n", myInput);
        if(myInput>random){
            printf("too high\n");
        }
        else if(myInput<random) {
            printf("too low");
        }
    }
}

Upvotes: 0

Views: 651

Answers (1)

Mike
Mike

Reputation: 4288

You had to initialize the starting point for rand() with a call of the srand() function.
There is a really good example in xc8 user guide on page 399.

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
void main (void){
    time_t toc; 
    int i;   
    time(&toc);
    srand((int)toc);
    for(i = 0 ; i != 10 ; i++)
        printf("%d\t", rand()); 
    putchar(’\n’);
}

Upvotes: 2

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