I am trying creating functions in C++ and getting error.

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C++

I was trying to create a function and got an error that "too few arguments to functions"
the code is given below:

#include<iostream>
using namespace std;

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

int main(){
    int d;
    int e;
    cout<<"enter num 1"<<endl;
    cin>>d;
    cout<<"enter num 2"<<endl;
    cin>>e;
    cout<<"the sum is"<<sum(d+e);
    return 0;
}

The error was like this:

PS E:\code practice> cd "e:\code practice\" ; if ($?) { g++ tutt9.cpp -o tutt9 } ; if ($?) { .\tutt9 }
tutt9.cpp: In function 'int main()':
tutt9.cpp:16:32: error: too few arguments to function 'int sum(int, int)'
   16 |     cout<<"the sum is"<<sum(d+e);
      |                                ^
tutt9.cpp:4:5: note: declared here
    4 | int sum(int a ,int b){
      |     ^~~
PS E:\code practice>

What I have tried:

Tried changing the project file but the same result every time.