In this C++ program, we generate N random numbers between 1 to 1000 using rand function. This program takes N as input from user and print N space separated random numbers on screen.

- The rand function of cstdlib standard library returns a pseudo-random number in the range of 0 to RAND_MAX, where RAND_MAX is a environment dependent value which is the maximum value returned by rand function.
- To generate random numbers between 1 to 1000, we will evaluate rand()%1000, which always return a value between 0 to 999. We will add 1 to this value to get a number between 1 to 1000.
- The probability of selection of any number between 1 to 1000 is 1/1000 or 0.001.

## C++ Program to Generate Random Numbers using Rand Function

#include <iostream> #include <cstring> #include <cstdlib> using namespace std; int main() { int n, random; cout << "Enter number of random numbers\n"; cin >> n; // print n random numbers using rand function cout << "Random numbers between 0 to 1000\n"; while(n--){ random = rand()%1000 + 1; cout << random << " "; } return 0; }Output

Enter number of random numbers 7 Random numbers between 0 to 1000 42 764 431 831 335 170 501

In above C++ program, we first take the count of random numbers as input from user and store it in variable "n". The using a while loop, we call rand function "n" times to generate random number between 1 to 1000 and print it on screen.

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