🔍 What is Forward Declaration?

Forward Declaration means telling the compiler about a function’s name and signature before actually defining it.

🧠 Why use Forward Declaration?

• Jab tum function ko pehle call karna chahte ho but uska definition baad me likha hai.
• Compiler ko batana padta hai function ka return type, name, aur parameters taaki woh call samajh sake.

✅ Syntax of Forward Declaration:

returnType functionName(parameterTypes);

Example:

int add(int, int);  // Forward declaration

🔄 How it works?

#include<iostream>
using namespace std;

int add(int, int);  // Forward declaration

int main() {
    int result = add(3, 4);
    cout << "Sum: " << result << endl;
    return 0;
}

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

🧠 Explanation:

• Compiler first sees forward declaration: int add(int, int);
• Fir main() me function call add(3,4) ko samajhta hai
• Jab function definition aati hai baad me, tab uska actual logic execute hota hai