struct: dynamic user input

Could you please show me how to change from static(below) to dynamically input data from the user, store it in struct and qsort it;

Code:

...
...
struct olympics { 
    char fname[15];
    char fname[15];
    char country[5];
    float time;
}; 
...
....
void print_struct_array(struct olympics *array, size_t len) 
{ 
    size_t i;
 
    for(i=0; i<len; i++) 
        //printf("\n[ athlete: %s \t time: $%.2f ]\n", array[i].athlete, array[i].time);
	printf("%s %s \t %.2f\n", array[i].athlete, array[i].country, array[i].time);
 
    puts("****");
} 
 
/* sorting structs using qsort() example */ 
void sort_structs_time(void) 
{ 
    struct olympics structs[] = {
		{"STENA John\t\t","FRA", 405.95f}, 
		{"PARKER Paul\t","GB", 403.01f},
		{"WHITE Lauren\t\t","NZL", 406.25f}, 
		{"BRUTTH Camille\t\t","FRA", 401.45f}, 
		{"BROWN Lewis\t","ITA", 404.50f}, 
		{"TURNER Mike\t\t","DNK", 403.98f }
	};
 
    size_t structs_len = sizeof(structs) / sizeof(struct olympics);
 
    puts("**** Athletes finishing time...");
 
    /* print original struct array */ 
    print_struct_array(structs, structs_len);
 
    /* sort array using qsort functions */ 
    qsort(structs, structs_len, sizeof(struct olympics), struct_cmp_by_time);
 
    /* print sorted struct array */ 
    print_struct_array(structs, structs_len);
...
....

 

Code:

// if declared in the same scope

struct olympics *dynamic = malloc(sizeof(*dynamic) * number_of_elements);
or 
struct olympics *dynamic = calloc(number_of_elements, sizeof(*dynamic));

// if declared elsewhere

dynamic = malloc(sizeof(olypmics) * number_of_elements);
or
dynamic = calloc(number_of_elements, sizeof(olympics));


if(dynamic) {   
   dynamic[index].field_name = some value
   (dynamic + index)->field_name = some value
}

qsort(dynamic, elements, sizeof(olympics), compare_function);

do something with sorted list

free(dynamic);