Having trouble getting this program to assign a seat and loop - c

Question

Having trouble getting this code to print 1 seat then loop back to user prompt. it should loop back until the seats are filled then display first class/ecoomy full. this is the code i have so far.
int main(int argc, char** argv) {
const int firstClass[] = {1, 2, 3, 4}; //first class array list
const int economyClass[] = {5, 6, 7, 8, 9, 10, 11, 12}; //economy array list
int firstLen = 4; // first class length
int economyLen = 8; //economy class length
int userInput;
int i;
//user prompt
printf("Please type 1 for First Class\n");
printf("Please type 2 for Economy\n");
printf("Please type 0 to Quit\n");
printf("\n");
scanf("%d", &userInput); // scanning for user input
if(userInput == 1){
for(i = 0; i < 4; i++){
if(i < firstLen){
printf("Class: First Seat Number: %d\n", firstClass[i]);
}
else{
printf("First Class is Full. Next flight is tomorrow.");
}
}
}
if(userInput == 2){
for (i = 0; i < 8; i++){
if(i < economyLen){
printf("Class: Economy Seat Number: %d\n", economyClass[i]);
}
else{
printf("Economy is Full. Next flight is tomorrow.");
}
}
}
}

Answer 1

As you want to take input from user as long as userInput != 0, so you need to take user input within a loop.
This loop will break when userInput will be 0.
Now about printing available seat from firstClass and economyClass, you can maintain 2 variables through which you keep track of last printed seat. Just like you maintain indexing while printing values of an array.
Here's a sample code. I've given some inline comments for better understanding.
int main(int argc, char** argv) {
const int firstClass[] = {1, 2, 3, 4}; //first class array list
const int economyClass[] = {5, 6, 7, 8, 9, 10, 11, 12}; //economy array list
int firstLen = 4; // first class length
int economyLen = 8; //economy class length
int firstClassSeatNumber = 0;
int economyClassSeatNumber = 0;
int userInput;
int i;
while(true) {
//user prompt
printf("Please type 1 for First Class\n");
printf("Please type 2 for Economy\n");
printf("Please type 0 to Quit\n");
printf("\n");
scanf("%d", &userInput); // scanning for user input
if (userInput == 0) {
break; // breaking the loop as we won't take further input from user
}
if(userInput == 1) {
if (firstClassSeatNumber < firstLen) {
// if we've any seat left in first class, then we'll print it
printf("Class: First Seat Number: %d\n", firstClass[firstClassSeatNumber]);
firstClassSeatNumber++; // moving to next seat of first class
}
else {
// don't have any seat left in first class
printf("First Class is Full. Next flight is tomorrow.");
}
}
else if(userInput == 2) {
if (economyClassSeatNumber < economyLen) {
// if we've any seat left in economy class, then we'll print it
printf("Class: Economy Seat Number: %d\n", economyClass[economyClassSeatNumber]);
economyClassSeatNumber++; // moving to next seat of economy class
}
else {
// don't have any seat left in economy class
printf("Economy is Full. Next flight is tomorrow.");
}
}
}
}