Simple Calculator Program in C

This C program implements a basic calculator with operations for addition, subtraction, multiplication, and division.

C Code:

/*
A simple calculator program in C.
*/

#include &ltstdio.h&gt

// Function to add two numbers
double add(double num1, double num2) {
    return num1 + num2;
}

// Function to subtract two numbers
double subtract(double num1, double num2) {
    return num1 - num2;
}

// Function to multiply two numbers
double multiply(double num1, double num2) {
    return num1 * num2;
}

// Function to divide two numbers
double divide(double num1, double num2) {
    if (num2 == 0) {
        printf("Error: Cannot divide by zero\n");
        return 0;
    }
    return num1 / num2;
}

int main() {
    // Example usage
    double num1 = 10.5;
    double num2 = 5.2;
    
    // Perform operations
    double sum = add(num1, num2);
    double difference = subtract(num1, num2);
    double product = multiply(num1, num2);
    double quotient = divide(num1, num2);
    
    // Output results
    printf("Sum: %.2lf\n", sum);
    printf("Difference: %.2lf\n", difference);
    printf("Product: %.2lf\n", product);
    printf("Quotient: %.2lf\n", quotient);
    
    return 0;
}
  

Explanation:

The C code above defines a simple calculator program with the following components:

• Function Definitions: Functions (add, subtract, multiply, divide) are defined to perform basic arithmetic operations.
• Function Documentation: Each function is described with comments to explain their purpose and behavior.
• Error Handling: The divide function checks if the divisor (num2) is zero and prints an error message if division by zero is attempted.
• Example Usage: Variables num1 and num2 are initialized with example values, and the functions are called to perform addition, subtraction, multiplication, and division operations.
• Output: The results of each operation (sum, difference, product, quotient) are printed to the console using printf with formatting specifiers (%.2lf for double).

Usage:

To use this calculator program:

1. Edit the values of num1 and num2 to input different numbers.
2. Compile the C program using a C compiler (e.g., gcc) and run the executable to perform addition, subtraction, multiplication, and division operations based on the input values.

Explanation:

1. Function Definitions:
   • Functions (add, subtract, multiply, divide) are explained with their roles in performing arithmetic operations in C.
2. Function Documentation:
   • Each function includes comments to describe their purpose and behavior.
3. Error Handling:
   • The divide function checks for division by zero and prints an error message if num2 is zero.
4. Example Usage:
   • Variables num1 and num2 are initialized with example values, and the functions (add, subtract, multiply, divide) are called to demonstrate arithmetic operations.
5. Output:
   • The results of each operation (sum, difference, product, quotient) are printed to the console using printf with formatting specifiers (%.2lf for double precision).
6. Usage Instructions:
   • Instructions are provided on how to use the calculator program by editing the input variables, compiling the C program using a C compiler, and running the executable to perform arithmetic calculations.