Define global variable in c++ program, C/C++ Programming

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Define global variable in c++ program:

How to define a global variable and need of global variable in c++ program.

int main()

{

int m=20;

clrscr();

for( int i=0;i<4;i++)

{

m=60;

cout << m;

cout<<"the global variable is\n"<

}

getch();

return m;

}

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