Build a Fun Rock Paper Scissors Game in C++ | Full Guide & Code (2025)

Rock Paper Scissors Game in C++ is a classic game where players choose one of three items—Rock Paper Scissors—and the winner is determined based on predefined rules. In this blog, we will look at a simple implementation of the game in C++ that lets the player compete against the computer.

Game Logic: Rock Paper Scissors Game

The game is based on simple rules:

• Rock crushes Scissors
• Scissors cuts Paper
• Paper covers Rock

A tie happens when both players choose the same option.

Key Components

Random Choice for the Computer: In the program, the computer selects its move randomly. This is done by generating a random number between 0 and 99, which is then mapped to either Rock ('r'), Paper ('p'), or Scissors ('s') based on specific ranges. For example:

• If the number is between 0 and 32, the computer picks Rock.
• If the number is between 33 and 66, it picks Paper.
• If the number is between 67 and 99, it picks Scissors.

This randomness ensures that the computer’s choices aren’t predictable, making the game more interesting.

Player’s Input: The player is prompted to enter their choice: Rock ('r'), Paper ('p'), or Scissors ('s'). This is compared to the computer’s choice to determine the outcome of the round.

Outcome Determination: The function rule checks the two choices and determines the result. It returns:

• 1 if the player wins,
• -1 if the player loses,
• 0 if it’s a tie.

Game Flow

The game operates in a loop, allowing the player to play multiple rounds:

1. The computer makes a random choice.
2. The player enters their choice.
3. The program compares the two choices and announces whether the player wins, loses, or ties.
4. The player is then asked if they want to play again. If they enter ‘n’, the game ends; otherwise, it continues.

User Interface

The game includes simple text-based prompts, with the following features:

• Instructions for the player.
• A display of the result after each round.
• A prompt to replay the game or exit.

The program’s output makes it easy for the player to follow along and decide whether to play again.

Rock Paper Scissors Game C++ 2025 Source Code:

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

int rule(char p, char c){
    if (p == c){
        return 0;
    }

    if (p == 'r' && c == 'p'){
        return -1;
    }
    else if (p == 's' && c == 'p'){
        return 1;
    }
    else if (p == 'p' && c == 'r'){
        return 1;
    }
    else if (p == 's' && c == 'r'){
        return -1;
    }
    else if (p == 'r' && c == 's'){
        return 1;
    }
    else if (p == 'p' && c == 's'){
        return -1;
    }
}

int main(){

    char computer;
    char player;
    char playmore;
    cout << "\t\t\t\t";
    for(int i = 0; i < 50; i++){
        cout << "-";
    }
    cout << endl;
    cout << "\t\t\t\t";
    cout << "\t Welcome to Rock, Paper and Scissors Game" << endl;
    cout << "\t\t\t\t";
    for(int i = 0; i < 50; i++){
        cout << "-";
    }
    cout << endl;
    cout << "\t\t\t\t";
    cout << "\t Note: " << endl;
    cout << "\t\t\t\t";
    cout << "\t\t r : Rock" << endl << "\t\t\t\t" << "\t\t p - Paper" << endl << "\t\t\t\t" << "\t\t scissor" << endl << "\t\t\t\t"<< endl << endl;
    cout << "\t\t\t\t";
    for(int i = 0; i < 50; i++){
        cout << "-";
    }
    cout << endl;
    do{
        int number = 0;
        srand(time(0));        // initialized time to 0
        number = rand() % 100; // will choose a number in range 0 - 99
        // r - for rock
        // p - for paper
        // s - for scissors
        if (number < 33)
        {
            computer = 'r';
        }
        else if (number > 66)
        {
            computer = 's';
        }
        else
        {
            computer = 'p';
        }
        // cout << "Note: \"r\" for \"Rock\", \"p\" for \"Paper\", \"s\" for \"Scissor\"." << endl;
        cout << "\t\t\t\t";
        cout << "Enter your choice: ";
        cin >> player;
        int result = rule(player, computer);
        if(result == 1){
            cout << "\t\t\t\t";
            cout << "You won! Hurray" << endl;
        }
        else if(result == -1){
            cout << "\t\t\t\t";
            cout << "You lose! Bad Luck" << endl;
        }
        else{
            cout << "\t\t\t\t";
            cout << "Woah! That's Tie!" << endl;
        }
        cout << "\t\t\t\t";
        cout << "Do you want to Play Again?" << endl;
        cout << "\t\t\t\t";
        cout << "Note: Press 'n' to exit! Press Anything to continue: ";
        cin >> playmore;
        cout << "\t\t\t\t";
        for(int i = 0; i < 50; i++){
            cout << "-";
        }
        cout << endl;
    }while(playmore != 'n');

    return 0;
}

Conclusion

This Rock Paper Scissors game in C++ is a fun and simple implementation that allows you to practice basic programming concepts like conditionals, loops, and random number generation. Whether you’re a beginner or just looking for a small project to practice your skills, this game is an excellent starting point.

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