C 지역변수, 전역변수

#include <stdio.h>

// Neede for exit
#include <stdlib.h>
#include <string.h>

int globalVar = 0;

int addTwoInts(int num1, int num2){
return num1 + num2;
}

void changeVariables(){
int age = 40;
printf("age inside of function = %d\n\n", age);
globalVar = 100;

printf("globalVar inside of function = %d\n\n", globalVar);


}

int main(void){
printf("\n");

int total = addTwoInts(3, 4);
printf("The Sum %d\n\n", total);

int age = 10;
globalVar = 50;

printf("age before a call to the function = %d\n\n", age);
printf("globalVar before a call to the function = %d\n\n", globalVar);

printf("age after a call to the function = %d\n\n", age);
printf("globalVar after a call to the function = %d\n\n", globalVar);


changeVariables();

}