C Program: Guess the number game with Do-While Loop

Last update on July 30 2025 12:56:18 (UTC/GMT +8 hours)

5. Random Number Guessing Game

Write a C program that generates a random number between 1 and 100 and asks the user to guess it. Use a do-while loop to give the user multiple chances until they guess the correct number.

Sample Solution:

C Code:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
    int randomNumber, userGuess, attempts = 0;

    // Seed the random number generator based on current time
    srand(time(NULL));

    // Generate a random number between 1 and 100
    randomNumber = rand() % 10 + 1;

    // Welcome message
    printf("Welcome to the Guess the Number Game!\n");

    // Guessing loop
    do {
        // Prompt the user to enter a guess
        printf("Input your guess (between 1 and 10): ");
        scanf("%d", &userGuess);

        // Increment the number of attempts
        attempts++;

        // Check if the guess is correct
        if (userGuess == randomNumber) {
            printf("Congratulations! You guessed the correct number in %d attempts.\n", attempts);
        } else if (userGuess < randomNumber) {
            printf("Number is too low. Try again!\n");
        } else {
            printf("Number is too high. Try again!\n");
        }

    } while (userGuess != randomNumber); // Continue the loop until the user guesses the correct number

    return 0;
}

Sample Output:

Welcome to the Guess the Number Game!
Input your guess (between 1 and 10): 2
Number is too high. Try again!
Input your guess (between 1 and 10): 3
Number is too high. Try again!	
Input your guess (between 1 and 10): 1
Congratulations! You guessed the correct number in 3 attempts.

Explanation:

Here are key parts of the above code step by step:

int randomNumber, userGuess, attempts = 0;: Declares variables to store the randomly generated number, the user's guess, and the number of attempts.
srand(time(NULL));: Seeds the random number generator based on the current time to ensure a different random number on each program run.
randomNumber = rand() % 100 + 1;: Generates a random number between 1 and 100.
printf("Welcome to the Guess the Number Game!\n");: Displays a welcome message.
do {: Marks the beginning of a do-while loop. The code inside the loop will be executed at least once before checking the loop condition.
printf("Enter your guess (between 1 and 100): ");: Prompts the user to input a guess.
scanf("%d", &userGuess);: Reads the user's guess.
attempts++;: Increments the number of attempts.
Checks if the guess is correct and provides feedback to the user.
} while (userGuess != randomNumber);: Specifies the loop condition. The loop continues until the user guesses the correct number.
return 0;: Indicates successful program execution.
}: Marks the end of the "main()" function.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to generate a random number and allow the user only five attempts to guess it correctly.
Write a C program where a random number is generated and the user must guess it, with hints provided after each guess.
Write a C program to generate a random number and stop taking guesses if the user enters an even number.
Write a C program to generate a random number and track the number of attempts it takes to guess correctly.

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