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Differentiate local variable and global variable in C++ program.

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1. Local scope: 

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

Eg: int sum(int n1,int n2) 

int s; 

s=n1+n2; 

return(s); 

}

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 anywhere in the program. 

Eg: 

int s; 

intsum(int n1,int n2) 

s=n1+n2; 

return(s); 

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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