#include <stdio.h>
// Function prototypes
void greet();                     // Function to display a greeting message
int add(int a, int b);            // Function to add two integers
void displayResult(int result);   // Function to display the result
int main() {
greet();                          // Call the greet function
int sum = add(5, 10);             // Call the add function with arguments 5 and 10
displayResult(sum);               // Call the displayResult function to show the result
return 0;                         // Indicate that the program ended successfully
}
// Function to display a greeting message
void greet() {
printf("Welcome to the Multi-Function Program!\n");  // Print greeting
}
// Function to add two integers
int add(int a, int b) {
return a + b;                    // Return the sum of a and b
}
// Function to display the result
void displayResult(int result) {
printf("The result is: %d\n", result);   // Print the result
}

#include <stdio.h>
// Function declarations
int add(int a, int b);
int subtract(int a, int b);
int multiply(int a, int b);
float divide(int a, int b);
int main() {
    int num1, num2, choice;
    printf("Enter two numbers: ");
    scanf("%d %d", &num1, &num2);

    printf("Choose an operation:n");
    printf("1. Add\n2. Subtract\n3. Multiply\n4. Divide\n");
    scanf("%d", &choice);

    switch (choice) {
        case 1:
            printf("Result: %d\n", add(num1, num2));
            break;
        case 2:
            printf("Result: %d\n", subtract(num1, num2));
            break;
        case 3:
            printf("Result: %d\n", multiply(num1, num2));
            break;
        case 4:
            if (num2 != 0) {
                printf("Result: %.2f\n", divide(num1, num2));
            } else {
                printf("Error: Division by zero is not allowed.\n");
            }
            break;
        default:
            printf("Invalid choice.\n");
    }
    return 0;
}

// Function definitions
int add(int a, int b) {
    return a + b;
}

int subtract(int a, int b) {
    return a - b;
}

int multiply(int a, int b) {
    return a * b;
}

float divide(int a, int b) {
    return (float)a / b;
}