As we know that, a variable is a named location in memory that is used to hold a value that may be modified by the program. All variables must be declared before they can be used.
We can declare variable in C++ anywhere in the scope just before the variable can in used.
Syntax: type variable_list;
Here, type must be a valid data type plus any modifiers, and variable_list may consist of one or more identifier names separated by commas.
Here are some declarations:int i,j,l; short int si; unsigned int ui; double balance, profit, loss;e.g
#include<conio.h> #include<iostream.h> void main() { int n; clrscr(); int sum=0; for(int i=0;i<5;i++) { cout<<"\n Enter no "; cin>>n; sum+=n; } float avg=sum/5.0; cout<<"\n sum = "<<sum<<" avg = "<<avg; getch(); }O/P
Enter no 1 Enter no 2 Enter no 3 Enter no 4 Enter no 5 Sum = 15 Avg = 30