Why User-Defined Functions are Crucial

1. Code Reusability: You can define a function once and call it whenever required, which reduces redundancy.
2. Modularity: Breaking a large program into smaller, manageable functions makes the code easier to understand, debug, and maintain.
3. Organization: Functions help organize the code logically into discrete blocks, each handling a specific task.
4. Maintainability: If a function has a bug, you can fix it in one place, instead of having to modify multiple places in the code.

Example

#include <stdio.h>
int add(int a, int b);

int main() 
{
    int result = add(3, 4);      
    printf("The result is: %d\n", result);
    return 0;
}

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