Simple calculator made in C

Simple Calculator

//Calculator program
#include <stdio.h>
#include <stdlib.h>

int main()
{
    int menu; //Variable for the number the user inputs
    float num1, num2, result; //Float variables for the user input and output, used floats in case the user enters e.g. 14.7

    printf("Enter a number from the list below\n\n");

    printf("1. Addition\n"); //Calculator menu, user must enter a value from 1 - 4 for the program to work
    printf("2. Subtraction\n");
    printf("3. Multiplication\n");
    printf("4. Division\n\n");

    printf("Enter number: "); //User input for the calculator menu
    scanf("%d", &menu);

    printf("\n");

    switch(menu) //switch statement for menu
    {
    case 1:
        printf("You entered Addition\n\n");

        printf("Enter first number: "); //User input for first number
        scanf("%f", &num1);

        printf("Enter second number: "); //User input for second number
        scanf("%f", &num2);

        printf("\n");

        result = num1 + num2; //Addition calculation

        printf("%.2f + %.2f = %.2f\n", num1, num2, result); //Addition output
        break;
    case 2:
        printf("You entered Subtraction\n\n");

        printf("Enter first number: "); //User input for first number
        scanf("%f", &num1);

        printf("Enter second number: "); //User input for second number
        scanf("%f", &num2);

        printf("\n");

        result = num1 - num2; //Subtraction calculation

        printf("%.2f - %.2f = %.2f\n", num1, num2, result); //Subtraction output
        break;
    case 3:
        printf("You entered Multiplication\n\n");

        printf("Enter first number: "); //User input for first number
        scanf("%f", &num1);

        printf("Enter second number: "); //User input for second number
        scanf("%f", &num2);

        printf("\n");

        result = num1 * num2; //Multiplication calculation

        printf("%.2f * %.2f = %.2f\n", num1, num2, result); //Multiplication Output
        break;
    case 4:
        printf("You entered Division\n\n");

        printf("Enter first number: "); //User input for first number
        scanf("%f", &num1);

        printf("Enter second number: "); //User input for first number
        scanf("%f", &num2);

        printf("\n");

        result = num1 / num2; //Division calculation

        printf("%.2f / %.2f = %.2f\n", num1, num2, result);
        break;
    default:
        printf("Enter correct number e.g 1 - 4\n"); //Outputted if the user enters a value other than 1 - 4
        break;
    }
    return 0;
}
//End of code

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Nice and clean implementation—simple calculators like this are great for understanding core logic and structuring operations clearly. It’s a solid base that could easily be extended with more advanced functions or better input handling.
If you ever plan to expand it, adding features similar to a scientific calculator free version (like exponents, trig functions, etc.) could make it even more useful.