Question

How to generate random floating point number between two numbers in C

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
  
double rand_double() {
    return (double)rand() / (double)RAND_MAX;
}
  
double rand_double_interval(double lower, double upper) {
    return rand_double() * (upper - lower) + lower;
}
  
int main() {
    srand(time(NULL));
      
    for (int i = 0; i < 20; i++) {
        printf("%lf\n", rand_double_interval(7.0, 13.0));
    }
    return 0;
}
  
  
  
/*
run:
  
9.490587
12.246089
8.830585
11.370813
8.041014
12.812351
8.536504
12.999038
12.459223
10.454104
11.576144
7.777342
11.923947
7.426162
12.568848
7.738428
10.933182
11.972028
11.991345
9.085973
  
*/

 

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