Convert coding from C++ to C

#include<iostream>
#include<string>

using namespace std;

int askBills(string prompt);
void totalExpenses(int car,int rent,int food,int phone,int gas,int util);

int main(){
    
cout << "Manage your budget and see how much you can save!\n\n";

int income = askBills("\nMonthly income:$ ");
int car = askBills("\nCar payment:$ ");   
int rent = askBills("\nMonthly rent:$ ");
int food = askBills("\nFood expenses:$ ");
int phone = askBills("\nPhone bill:$ ");
int gas = askBills("\nEstimated gas expenses:$ ");
int util = askBills("\nMonthly utilities:$ ");

totalExpenses(car, rent, food, phone, gas, util);

   
system("pause");   
return 0;    
}
int askBills(string prompt){
int bill;
cout << prompt;
cin >> bill;
return bill;       
}
void totalExpenses(int car,int rent,int food,int phone,int gas,int util){
cout << "\nYour monthly expenses:$ "<<car+rent+food+phone+gas+util <<="" endl;="" 
}

What I have tried:

<b="">What I have tried:

This is my coging, but i need to convert it to c