- C++ Programming Examples
- C++ Programming Examples
- C++: Hello World
- C++: Get Input
- C++: Print Integer
- C++: Add two numbers
- C++: Add, Sub, Multiply, Div
- C++: Add Digits
- C++: Find Average and Percentage
- C++: Find Arithmetic Mean
- C++: Sum of n Natural Numbers
- C++: Sum of n Numbers
- C++: Square's Area and Perimeter
- C++: Rectangle's Area and Perimeter
- C++: Triangle's Area and Perimeter
- C++: Area and Circumference
- 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 a Number
- C++: Find Factors of a Number
- C++: Find HCF and LCM
- C++: Create a Calculator
- C++: Count Digits in a Number
- C++: First and Last Digit Sum
- C++: Product of Number Digits
- 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
- C++: Check Reverse equals Original
- C++: Check Perfect Number
- C++: Check Palindrome or Not
- C++: Check Armstrong or Not
- C++: Divisibility Test
- C++: Find Labor Wage
- 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
- C++: Largest Element in an Array
- C++: Smallest Element in an Array
- C++: Find Second Largest Element
- C++: Find Second Smallest Element
- C++: Sum of All Elements
- C++: Multiply All Elements
- C++: Element in Even Position
- C++: Element in Odd Position
- C++: Print Even Numbers in Array
- C++: Print Odd Numbers in Array
- C++: Count Even or Odd Numbers
- C++: Sum of Even or Odd Numbers
- C++: Count Positive, Negative, Zero
- C++: Reverse an Array
- C++: Insert an Element
- C++: Delete an Element
- 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 String Length
- C++: Compare Two Strings
- C++: Copy String
- C++: String Concatenation
- C++: Reverse a String
- C++: Delete Vowels from a String
- C++: Delete a Word from a String
- C++: Count Characters in a String
- C++: Count Words in a String
- C++: Frequency of Words
- C++: Remove Spaces from Strings
- C++: Sort a String
- C++: Uppercase to Lowercase
- C++: Lowercase to Uppercase
- C++: Swap Two Strings
- C++: Check the Anagram or Not
- C++: Capitalize All Words in a String
- C++: Get Numbers from a String
- C++ File Programs
- C++: Read a File
- C++: Write Content to a File
- C++: Append Data to a File
- C++: Read and Display File
- C++: Copy a File
- C++: Merge Two Files
- Count Characters in a File
- C++: Capitalize Every Word
- C++: List Files in Directory
- C++: Delete a File
- C++: Encrypt and Decrypt a File
- C++ Misc Programs
- C++: Print ASCII Value
- C++: Add Binary Numbers
- C++: Generate Random Numbers
- C++: Print a Smiling Face
- C++: Days into Years and Months
- C++: Add Two Numbers using Pointer
- C++: Print Fibonacci Series
- C++: Generate Armstrong Numbers
- C++: Find nCr and nPr
- C++: Get IP Address
- C++: Print Date and Time
- C++: Shutdown and Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
C++ program to generate random numbers
This article will teach you how to generate and print random numbers using the C++ programming language. Here is the list of programs that generates random numbers:
- Generate 10 random numbers
- Produce random numbers with no repetition
- Generate random numbers in the given range
How to Generate Random Numbers
To generate a random number, use the rand() function. This function is defined in the stdlib.h header file.
Generate 10 random numbers in C++
This program generates and prints 10 random numbers using a for loop and the 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 built and runs under the 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 previously. So to solve this problem and generate random numbers without repetition, we've got another program for you.
Generate random numbers with no repetition in C++
This is the program that generates random numbers without repetition. Here, we've used the srand() (seed random) function to set the initial point for generating random numbers using the time() function.
Note: The time() function is used to set the initial point for the srand() function. Here we've used the time() function because it is the thing that is continuously changing its value.
The function time() is defined in time.h header file. So don't forget to include this header file before executing the program given below. The rest of the program is identical to the previous one.
#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 the previous program. The only difference is that every time we execute this program, we'll get random numbers without repetition. Or we'll get different random numbers.
In C++, produce random numbers in the given range
This is the last program that generates random numbers in a given range. The user must supply the range at runtime.
That is, this program asks the user to enter the interval first. For example, if the user enters the interval as 5 and 20, then the program further asks for 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 program's initial output:
Now enter the interval, say 1 to 100, and then enter the amount, say 10, to generate 10 random numbers between 1 and 100. That is, after supplying these inputs, the 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:
The same program in different languages
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