Random number generation in C++

Let us see how to generate random numbers using C++. Here we are generating a random number in range 0 to some value. (In this program the max value is 100).

To perform this operation we are using the srand() function. This is in the C library. The function void srand(unsigned int seed) seeds the random number generator used by the function rand.

The declaration of srand() is like below:

void srand(unsigned int seed)

It takes a parameter called seed. This is an integer value to be used as seed by the pseudo-random number generator algorithm. This function returns nothing.

To get the number we need the rand() method. To get the number in range 0 to max, we are using modulus operator to get the remainder.

For the seed value we are providing the time(0) function result into the srand() function.

Example Code

#include
#include
#include
using namespace std;
main() {
   int max;
   max = 100; //set the upper bound to generate the random number
   srand(time(0));
   cout 

Output 1
The random number is: 51
Output 2
The random number is: 29
Output 3
The random number is: 47