Charles? *Text[]？ =? {"Exit",? The sum of two numbers,
"the difference between two numbers" and "the product of two numbers",
"Quotient of multiplication of two numbers"};
int？ Major (invalid)
{
Double? n 1，？ n2，？ Results;
int？ Choose;
Printf ("Please enter two real numbers:");
scanf("%lf%lf "，& ampn 1，？ & ampN2)；
while( 1)
{
for(int？ Me? =? 1; ? Me? & lt？ sizeof(Text)/sizeof(char？ *); ? i++)
Printf("%d.%s%s\n ",I,? "Output" text [i]);
printf("5。 %s\n "，text[0])；
Printf ("Please enter your choice:?" );
Scanf("%d ",& select);
If (choose? ==? 5)
{
Printf ("Quit closing program \ n");
Return? 0;
}
If (choose? & lt？ 0? ||? Choice? & gt？ 4)
{
Printf ("Sorry, this option is not available \ n");
Continue;
}
Switch (selection)
{
Case? 1:
{
The result? =? n 1？ +? N2；
Break;
}
Case? 2:
{
The result? =? n 1？ -? N2；
Break;
}
Case? 3:
{
The result? =? n 1？ *? N2；
Break;
}
Case? 4:
{
The result? =? n 1？ /? N2；
Break;
}
}
printf("%s%s:%.2lf\n "，？ Text [selection],? "For"? Results);
}
Return? 0;
}