C-C++ Global variables

Scope: Global variables are visible to all the function of a program. They are everywhere and can be accessed from another file of the project.

Default value: All uninitialized global variables will have 0 as a default value.

Lifetime: Till the end of the execution of the program.

Example

#include <stdio.h>

int myVariable;      // Declaration of a global variable

int main(){
	myVariable = 540;
	printf("The variable has the value of %d", myVariable);
	return 0;
}

Output

The variable has the value of 540

No error at all!