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11.Functions.c
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11.Functions.c
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#include <stdio.h>
// Function declarations (prototypes)
// We need to declare functions before main if the functions are defined after main.
int add(int a, int b); // A function that takes two integers and returns their sum
void greet(); // A function that returns nothing (void) and takes no parameters
float calculateAverage(float num1, float num2); // A function that returns a float and takes two float parameters
// Function definitions
void greet() {
printf("Hello! Welcome to the function demo.\n");
}
int add(int a, int b) {
return a + b; // Returns the sum of a and b to the caller
}
float calculateAverage(float num1, float num2) {
return (num1 + num2) / 2; // Computes and returns the average
}
// Main function - Program execution starts here
int main() {
int x = 5, y = 10, sum;
float avg;
// Calling the greet function
greet(); // This function doesn't take any arguments and doesn't return any value
// Calling the add function
sum = add(x, y); // Passing x and y as arguments to the function add
printf("The sum of %d and %d is: %d\n", x, y, sum); // Output: 5 + 10 = 15
// Calling the calculateAverage function
avg = calculateAverage(4.5, 3.0); // Passing 4.5 and 3.0 to calculateAverage
printf("The average is: %.2f\n", avg); // Output the average formatted to 2 decimal places
return 0; // End of the main function, returns 0 to indicate successful execution
}