- C++ Programming Examples
- C++ Programming Examples
- C++ Hello World
- C++ Get Input
- C++ Print Integer
- C++ Add Two Numbers
- C++ Add Sub Mul Div
- C++ Add Digits
- C++ Find Average Perc
- C++ Find Arithmetic Mean
- C++ Sum of n Natural Numbers
- C++ Sum of n Numbers
- C++ Area Perimeter of Square
- C++ Area Perimeter of Rectangle
- C++ Area Perimeter of Triangle
- C++ Area Circum of Circle
- C++ Find Simple Interest
- C++ Fahrenheit to Celsius
- C++ Celsius to Fahrenheit
- C++ Print Prime Numbers
- C++ Reverse a Number
- C++ Swap Two Numbers
- C++ Print Multiplication Table
- C++ Find Factorial of Number
- C++ Find Factors of Number
- C++ Find HCF & LCM
- C++ Make Calculator
- C++ Count Digits in Number
- C++ Sum of First & Last Digit
- C++ Product of Digits of Number
- C++ Sum of Squares of Digits
- C++ Interchange Digits of Number
- C++ if else Programs
- C++ Check Even or Odd
- C++ Check Prime or Not
- C++ Check Alphabet or Not
- C++ Check Vowel or Not
- C++ Check Leap Year or Not
- Check Reverse equal Original
- C++ Check Perfect Number
- C++ Check Palindrome or Not
- C++ Check Armstrong or Not
- C++ Divisibility Test
- C++ Find Wage of Labor
- C++ Find Discounted Price
- C++ Find Shipping Charge
- C++ Find Telephone Bills
- C++ Calculate Student Grade
- C++ Largest of Two Numbers
- C++ Largest of Three Numbers
- C++ Number Conversion
- C++ Decimal to Binary
- C++ Decimal to Octal
- C++ Decimal to Hexadecimal
- C++ Binary to Decimal
- C++ Binary to Octal
- C++ Binary to Hexadecimal
- C++ Octal to Decimal
- C++ Octal to Binary
- C++ Octal to Hexadecimal
- C++ Hexadecimal to Decimal
- C++ Hexadecimal to Binary
- C++ Hexadecimal to Octal
- C++ Pattern Programs
- C++ Pattern Programs
- C++ Print Diamond Pattern
- C++ Print Floyd's Triangle
- C++ Print Pascal's Triangle
- C++ Array Programs
- C++ 1D Array Program
- C++ Linear Search
- C++ Binary Search
- Find Largest Element in Array
- Find Smallest Element in Array
- Find Second Largest Element
- Find Second Smallest Element
- C++ Sum of All Elements
- C++ Multiply All Elements
- C++ Element on Even Position
- C++ Element on Odd Position
- C++ Print Even Numbers in Array
- C++ Print Odd Numbers in Array
- C++ Count Even/Odd Numbers
- C++ Sum of Even/Odd Numbers
- C++ Count Positive Negative Zero
- C++ Reverse an Array
- C++ Insert Element in Array
- C++ Delete Element from Array
- C++ Merge two Arrays
- C++ Bubble Sort
- C++ Selection Sort
- C++ Insertion Sort
- C++ Common Elements
- C++ 2D Array Programs
- C++ Add Two Matrices
- C++ Subtract Two Matrices
- C++ Transpose Matrix
- C++ Multiply Two Matrices
- C++ 3D Array Programs
- C++ String Programs
- C++ Print String
- C++ Find Length of String
- C++ Compare Two Strings
- C++ Copy String
- C++ Concatenate String
- C++ Reverse a String
- C++ Delete Vowels from String
- C++ Delete Word from String
- C++ Count Character in String
- C++ Count Word in String
- C++ Frequency of Word
- C++ Remove Spaces from String
- C++ Sort a String
- C++ Uppercase to Lowercase
- C++ Lowercase to Uppercase
- C++ Swap Two Strings
- C++ Check Anagram or Not
- C++ Capitalize All Words in String
- C++ Capitalize Specific Character
- C++ Get Numbers from String
- C++ File Programs
- C++ Read a File
- C++ Write Content to File
- C++ Append Data in File
- C++ Read & Display File
- C++ Copy a File
- C++ Merge Two Files
- Count Characters, Words in File
- C++ Capitalize All Words in File
- C++ List Files in Directory
- C++ Delete a File
- C++ Encrypt & Decrypt a File
- C++ Misc Programs
- C++ Print ASCII Value
- C++ Add Binary Numbers
- C++ Generate Random Numbers
- C++ Print Smiling Face
- C++ Days into Years, Months
- Add Two Numbers using Pointer
- C++ Print Fibonacci Series
- Generate Armstrong Numbers
- C++ Find nCr and nPr
- C++ Get IP Address
- C++ Print Date/Time
- C++ Shutdown, Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
- C++ Programming Test
- C++ Programming Test
- Give Online Test
- All Test List
C++ Program to Generate Random Numbers
In this article, you will learn and get code to generate and print random numbers in C++ language. Here are the list of programs on random numbers:
- Generate 10 Random Numbers
- Generate Random Numbers without Repetition
- Generate Random Numbers in given Range
How to Generate Random Numbers ?
To generate random number, use rand() function. This function is defined in stdlib.h header file.
Generate 10 Random Numbers
This program generates and prints 10 random numbers using for loop and rand() function.
#include<iostream> #include<stdlib.h> using namespace std; int main() { int i; for(i=0; i<10; i++) cout<<rand()<<endl; cout<<endl; return 0; }
This program was build and run under Code::Blocks IDE. Here is its sample output:
Note - If you re-run the above program, then it'll produce the same 10 random numbers as produced previously. So to solve this problem and generate random numbers without repetition, we've another program for you.
Generate Random Numbers without Repetition
This is the program that generates random numbers without repetition. Here we've used srand() (seed random) function to set the initial point for generating random numbers using time() function.
Note - The time() function is used to set initial point for srand() function. Here we've used time() function, because it is the thing that is continuouly changing its value.
The function time() is defined in time.h header file. So don't forgot to include this header file, before executing the program given below. Rest of the things are same as in previous program.
#include<iostream> #include<stdlib.h> #include<time.h> using namespace std; int main() { int i; srand(time(0)); for(i=0; i<10; i++) cout<<rand()<<endl; cout<<endl; return 0; }
This program produces the same output as of previous program. The only difference is, everytime while executing this program, we'll get random numbers without repetition. Or we'll get different-different random numbers.
Generate Random Numbers in Given Range
This is the last program, that generates random numbers in given range. The range must be provided by user at run-time
That is, this programs asks from user to enter the interval first. For example, if user enters interval as 5 and 20, then program further asks to enter the amount say 10, to generate 10 random numbers between 5 and 20. Let's have a look at the program
#include<iostream> #include<stdlib.h> #include<time.h> using namespace std; int main() { int i, rnum, amount, first, last; cout<<"Enter the Interval: "; cin>>first>>last; cout<<"How many Random Numbers to Generate ? "; cin>>amount; cout<<"\nList of "<<amount<<" Random Numbers Between "<<first<<" and "<<last; srand(time(0)); for(i=0; i<amount; i++) { rnum = rand()%(last+1-first)+first; cout<<endl<<rnum; } cout<<endl; return 0; }
Here is its sample run. This is the initial output produced by this program:
Now enter the interval say 1 and 100, then enter the amount say 10 to generate 10 random numbers between 1 to 100. That is, after supplying these inputs, program will print 10 random numbers, where all random numbers must be greater than or equal to 1 and less than or equal to 100:
Same Program in Other Languages
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