How do I remove Global variables in a C program to make the code have better abstraction and cohesion. Please help me understand through my example:

#include #include

int fifty = 0; int twenty = 0; int ten = 0; int five = 0;

void calculateChangeCoins(int change) {

if(change > 0) { if(change >= 50) { // if change is greater than 50 cents change -= 50; fifty++; } else if(change >= 20) { // if change is greater than 20 cents change -= 20; twenty++; } else if(change >= 10) { // if change is greater than 10 cents change -= 10; ten++; } else if(change >= 5) { // if change is greater than 5 cents change -= 5; five++; } else { printf(" Error : Invalid Change given!!!"); exit(0); } calculateChangeCoins(change); } }

void printTheChange() {

printf(" Change recived: "); if(fifty) // if 50 Cent coins are there in the change, print how many are there printf("Number of fifty cent coins: %d ", fifty); if(twenty) // if 20 Cent coins are there in the change, print how many are there printf("Number of twenty cent coins: %d ", twenty); if(ten) // if 10 Cent coins are there in the change, print how many are there printf("Number of ten cent coins: %d ", ten); if(five) // if 05 Cent coins are there in the change, print how many are there printf("Number of five cent coins: %d ", five); }

int readChange() { int change; // read the change printf("Enter the amount of money to be given back in chnage: "); scanf("%d%*c", &change); return change; }

int main() { int change = readChange(); calculateChangeCoins(change); // uses recusrion to calulate the correct change for the user printTheChange(); // uses printTheChange() function to output change values return 0;

}