Fonction rand()

Question

Ever time I excused program is give me same number why?
It's give me like this : le point is (34.56 , 34.56 )

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

double reel(){
srand(time(NULL));
double s=rand()%2==0?-1:1;
return s*sqrt(rand()%1001);
}
typedef struct {
double abs;
double ord;
} point ;

point RandomPoint(){
point p;
p.abs=reel();
p.ord=reel();
return p;

}

int main(){
point p=RandomPoint();
printf(" le point is (%.2lf , %.2lf )",p.abs,p.ord);
return 0;
}

Answer 1

I made some changes from your code

https://code.sololearn.com/cjQfVPIl8heS/?ref=app

Answer 2

Put this as first line in main() before call to RandomPoint()

srand( time( NULL ));

Answer 3

Thank you I understand

Answer 4

Typos:
#include <stdio.h> // <studio.h>
double reel() // Double

(Edit)
OP corrected the typos in thread's Description

Seed the RNG in the main() function, not in reel() function.

srand( time( NULL ) ); // put this in main() function.

Answer 5

Do i have put RNG in the main but fonction RandomPoint () is defined with fonction real()

i did put srand(time(NULL)); but it's give me same number like le point is (-28.72 , -28.72)

Answer 6

I did it, i put srand (time(NULL)); in first line in main() but same problem same number.