Rand() returning the same value even with the inclusion of srand((unsigned)time(NULL)

Question

Why the function scrolled below always returns the same values when called multiple times, although Seed srand((unsigned)time(NULL)) has been initialized?

#include <time.h>
#include <stdio.h>

int rolaDados(int *a){
    srand((unsigned)time(NULL));
    int i = 0;
    int temp = 0;


    for(i=0;i<3;i++){
       temp += 1 + rand()%6;
    }
    return(temp);
}

void main(){
    int a=rolaDados(&a);
    int b=rolaDados(&b);
    int c=rolaDados(&c);

    printf("%d\n%d\n%d",a,b,c);
}

Example of an exit:

13
13
13
--------------------------------

Answer 1

Your mistake is that you are casting a seed several times, put srand in the main and see the result.

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

int rolaDados(){
    int i = 0;
    int temp = 0;

    for(i=0;i<3;i++){
       temp += 1 + rand() % 6;
    }

    return(temp);
}

void main(){
    srand(time(NULL));

    int a=rolaDados();
    int b=rolaDados();
    int c=rolaDados();

    printf("%d\n%d\n%d",a,b,c);
}