Solved: random number between 2 in C

Generating Random Numbers between 2 in C Programming Language

The ability to generate random numbers can be critical in certain types of computer programming tasks, particularly in algorithm design or where simulation is required. In this article, we’ll delve into a fundamental aspect of C programming, which is generating random numbers. We’ll assume you have a basic understanding of the C programming language. C is a powerful general-purpose language that gives programmers more control and efficiency, being excellent for programming at a low level

You are probably here because you need a solution on how to generate a random number between 2 in C. This is an essential technique, particularly in games and in situations where you need to simulate unpredictability in your programs. Let’s dive in.

Understanding the Solution

Conceptually, the idea to generate a random number between 2 in C involves the use of specific library functions provided by the language primarily the rand() and srand() functions. The rand() is used to generate a series of pseudorandom numbers, but to ensure these numbers don’t follow a recognizable pattern, we also use srand() function, which seeds the random number generator to give us better randomness.

Importantly, you may need to tweak the code according to the range within which you want the random numbers to fall. For instance, if you wish to a random number between 1 and 2, you will use a different equation from when you want a number between 2 and 100.

Step-by-Step Explanation of the Code

Here’s the complete code block for generating a random number between 2 using the C programming language:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main() 
    int random_number = rand() % 2 + 1;    
    printf("%dn", random_number);
    return 0;

Let’s break the code down piece by piece:

  • We first include the necessary standard input/output library stdio.h and the standard library stdlib.h that contains the rand() and srand() functions.
  • We seed the random number generator using srand(time(0)). This ensures that you get a different sequence of random numbers every time you run your program.
  • Then, we generate the random number using the rand() function and the modulus operation % 2 + 1 to restrict the range of generated numbers from 1 to 2.
  • Finally, we use printf to print out our random number to the console.

Delving Deeper: Libraries and Functions

In this section, we will dive deeper into the two main functions we used, rand() and srand(), which operate within the stdlib.h library. These functions are invaluable when needing random numbers. However, they do rely on a pseudo-random generator that needs seed input to ensure that it doesn’t reproduce the same sequence of numbers – a situation that would defy our purpose of achieving randomness. The srand() function is specifically used in this regard.

Essentially, using time(0) as seed input guarantees that each time you run the program, the pseudo-random generator takes the seed from the current time which is continuously changing and hence, the output sequence is different every time.

Related posts:

Leave a Comment