How does the random number generator work in C?

Question

I\'m trying to generate random number between 0 and 40(inclusive). So the code I Implemented is this-

 y=rand()%41;

However everytime I click c

Answer 1

rand() generates only pseudorandom numbers. This means that every time you run your code you will get exactly the same sequence of numbers.

Consider using

srand(time(NULL))

to get every time different numbers. In fact a possible implementation for rand is

next = next * 1103515245 + 12345;
return (UINT32)(next>>16) & RAND_MAX;

where next is defined as

static UINT32 next = 1;

Calling srand() has the effect of changing the initial value of next, thus changing the "next" value you get as result.