1.

Explain two types of variable according to its scope and life.

Answer»

1. Local scope: A variable declared inside a block can be used only in the block. It cannot be used any other block. 

eg: #include<iostream>

using namespace std; 

int sum(int n1 ,int n2) 

{

int s; s = n1 + n2; 

return (s); 

} 

int main() 

{ 

int n1 ,n2; 

cout<<“Enter 2 numbers cin>>n1>>n2;

cout<<“The sum is “<<sum(n1 ,n2);

} 

Here the variable s is declared inside the function sum and has local scope;

2. Global scope: 

A variable declared outside of all blocks can be used any where in the program. 

#include<iostream>

using namespace std; 

int s; 

int sum(int n1,int n2) 

{ 

s = n1 + n2; 

return(s); 

} 

int main() 

{ 

int n1 ,n2;

cout<<“Enter 2 numbers cin>>n1>>n2;

cout<<“The sum is “<<sum(n1 ,n2);

} 

Here the variable s is declared out side of all functions and we can use variable s any where in the program.


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