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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<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;
main() {
int max;
max = 100; //set the upper bound to generate the random number
srand(time(0));
cout << "The random number is: "<<rand()%max;
}Output 1
The random number is: 51
Output 2
The random number is: 29
Output 3
The random number is: 47
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