#include <iostream>
using namespace std;

void enter(){
cout << "\nPress Enter to continue.";
cin.get();
}

void aa(){
system("clear");
cout << "Display a number from 50 down to 30\n" << endl;
for(int i=50; i>=30;i-=1){
cout << i<<endl;
}
enter();
}
void bb(){
system("clear");
cout <<"Display a number starting from 0 to 100 \n with interval of 5" << endl;
for(int i=0; i<=100;i+=5){
cout << i<<endl;
}
enter();
}
void cc(){
system("clear");
int s=0;
cout << "Display the sum of all number from 10 to 50"<<endl;
for(int i=10; i<=50;i++){
cout << s << " + " << i << " = " << (s+=i) << endl;
}
cout << "Total sum 10 to 50 is " << s <<endl;
enter();
}
void dd(){
system("clear");
cout << "Good bye Boii" <<endl<<"Get the on https://pastebin.com/byzi6g85 ";
}
int main(){
char x;
while(x!='d'){
system("clear");
cout << "Main menu:"<<endl;
cout <<"\t[a] Display a number from 50 down to 30"<<endl;
cout <<"\t[b] Display a number from 0 to 100 by 5"<<endl;
cout <<"\t[c] Display the sum of all number from 10 to 50"<<endl;
cout <<"\t[d] Exit"<<endl;
cout <<"Choose a Letter: ";
cin >> x;
cin.ignore(1000,'\n');

switch(x){
case 'A':
case 'a':
aa();
break;
case 'B':
case 'b':
bb();
break;
case 'C':
case 'c':
cc();
break;
case 'D':
case 'd':
dd();
break;
default:
cout <<"\nInvalid choice."<<endl;
enter();
}
}
return 0;
}