Terms are the upper limit, lower limit and the gap between numbers e.g. +1 = 1,2,3,4 while +2 = 2,4,6,8
(rand() % (upper - lower + gap)) + lower;
So to generate a random number between 1-200, with gap between numbers of +1 (1, 2, 3.....):
(rand() % (200 - 1 + 1)) + 1;
Also, in your program, you need to call #include <stdlib.h> header file, since this is where rand function is supported