C code random in range (int8_t result may be changed with other values as well). Prints results on console - tested with GCC and Code::Blocks

random_in_range.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <time.h>

#define _MIN_   -10
#define _MAX_   50
#define _RANGE_    _MAX_-_MIN_
int8_t min = _MIN_;
int8_t max = _MAX_;

uint16_t rangeArray[_RANGE_];

static int8_t randInRangeInt8(int8_t min, int8_t max)
{
	int8_t res = min + rand() / (RAND_MAX / (max - min + 1) + 1);
	return res;
}


int main()
{
    printf("Random in range test!\n");

    memset(rangeArray, 0, _RANGE_);

    srand(time(NULL));

    uint32_t t;
    for(t = 0; t < 5000; t++)
    {
        int8_t res = randInRangeInt8(min, max);
        if((res < min) || (res > max))
        {
            printf("ERROR!!!! res=%d, iterator t=%d\r\n", res, t);
            return -1;
        }
        else
        {
            if(rangeArray[res-_MIN_] < 65535)
                rangeArray[res-_MIN_]++;
        }
    }

    printf("\r\n\r\n");
    for(t = 0; t < _RANGE_; t++)
    {
        printf("[%.3d]:%.3d => ", t+_MIN_, rangeArray[t]);
        int val = rangeArray[t];
        while(val > 0)
        {
            printf("*");
            val--;
        }
        printf("\r\n");
    }

    return 0;
}