functions and function prototyping in c++

 #include<iostream>

using namespace std;

// int sum(int a, int b){
//     int c = a+b;
//     return c;
// }

/**********FUNCTION PROTOTYPE************* */

int sum(int a, int b); //ab program run hojaega
void greet(void);
// void greet();---> acceptable hai
//ye assurity deta hai ki sum function aage hai
//int sum(int a, int b);--->acceptable
//int sum(a, b);---> not acceptable
//int sum(int, int);--->acceptable

int main() {
    //compiler main function se read krna start krta code ko.
    /*************FUNCTION*************/
    /*main is itself a function and yaha return zero ka mtlb hai ki
    ye program successfully execute hogya ha and koi dikkat nhi aai hai*/
   
    int k;
    int s;
    cout<<"enter the value of k "<<endl;
    cin>>k;
    cout<<"enter the value of s "<<endl;
    cin>>s;
    cout<<"the value of sum is "<<sum(k,s)<<endl;

    /**********FORMAL AND ACTUAL PARAMETERS********* */

    /*k and s are actual parameter and formal parameters a and b will be taking value from
    actual parameters k and s*/
    //formal parameters aur actual parameters same bi ho skte hain

    /*jese hi sum ko k and s diya. compiler sum ko dhundega and k aur s ki value a aur b
    ko dedega and sum function c ki value return krega which is a+b*/

    greet(); //ese run nhi hoga dikhaega greet was not declares so function prototype ka use krna hoga

    return 0;
}

int sum(int a, int b){
    int c = a+b;
    return c;
}

//sum ko baad m likhenge ese to btage sum was not declared, yaha use ata h function prototypes
/*function prototyping btata h pehle se compiler ko ki ye function aane vala hai
so compiler pehle se ready hojata h uss function ko execute krne ke liye*/

void greet(){
    cout<<"hello krisha";
}

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