The randomize() function initializes the random number generator with a random value based on time. You can try the sample program given below in Turbo-C, it may not work as expected in other compilers. /* Prints a random number in the range 0 to 99 */ #include <stdlib.h> #include <stdio.h> #include <time.h> int main(void) { randomize(); printf("Random number in the 0-99 range: %d\n", random (100)); return 0; }