C Program to calculate product of numbers 1 to 5 using while loop

Last update on July 29 2025 12:58:39 (UTC/GMT +8 hours)

3. Product of Numbers from 1 to 5

Write a C program that calculates the product of numbers from 1 to 5 using a while loop.

Sample Solution:

C Code:

#include <stdio.h>

int main() {
    int number = 1;  // Initialize the variable to store the current number
    int product = 1; // Initialize the variable to store the product

    // Start a while loop to iterate from 1 to 5
    while (number <= 5) {
        // Update the product by multiplying it with the current number
        product *= number;

        // Print the current number and product in each iteration
        printf("Current number: %d, Current product: %d\n", number, product);

        // Increment the number for the next iteration
        number++;
    }

    return 0;  // Indicate successful program execution
}

Sample Output:

Current number: 1, Current product: 1
Current number: 2, Current product: 2
Current number: 3, Current product: 6
Current number: 4, Current product: 24
Current number: 5, Current product: 120

Explanation:

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

#include <stdio.h>: This line includes the standard input-output library, allowing functions like "printf()".
int number = 1;: Declares an integer variable 'number' and initializes it to 1. This variable is used to store the current number during the loop.
int product = 1;: Declares an integer variable 'product' and initializes it to 1. This variable is used to store the product of numbers during the loop.
while (number <= 5) {: Starts a "while" loop that continues as long as 'number' is less than or equal to 5.
product *= number;: Updates the product by multiplying it with the current value of 'number'.
printf("Current number: %d, Current product: %d\n", number, product);: Prints the current value of 'number' and the current value of 'product' in each iteration.
number++;: Increments the value of 'number' for the next iteration.
}: Closes the "while" loop.
return 0;: Indicates that the program executed successfully and returns 0 to the operating system.
}: Closes the "main()" function.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to calculate the product of numbers from 1 to 5 using a while loop while skipping numbers divisible by 2.
Write a C program to compute the product of numbers from 1 to 5 using a while loop and reset the product to 1 if it exceeds a threshold during computation.
Write a C program to calculate the product of numbers from 1 to 5 using a while loop and then count the number of digits in the final product.
Write a C program to compute the product of numbers from 1 to 5 using a while loop and multiply prime numbers by an extra factor of 2.

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