Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to generate different random numbers in a loop in C++?
Let us see how to generate different random numbers using C++. Here we are generating random numbers 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
#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));
for(int i = 0; i<10; i++) { //generate 10 random numbers
cout << "The random number is: "<<rand()%max << endl;
}
}Output
The random number is: 6 The random number is: 82 The random number is: 51 The random number is: 46 The random number is: 97 The random number is: 60 The random number is: 20 The random number is: 2 The random number is: 55 The random number is: 91
3K+ Views
