C menu system - switch not triggering - c

Question

I've been looking at this issue for a while now and I know it's super basic but can't for the life of me work out where it's going wrong.
Basic menu system in C, takes in an integer and returns the appropriate result:
The menu displays fine, it takes the input fine but it doesn't seem to trigger the switch ie. if I hit option 1, it doesn't display the message.
int main(void) {
#define LSIZE 5
int selection[LSIZE];
do {
printf("\n Welcome to Menu");
printf("1) option 1\n");
printf("2) option 2\n");
printf("3) QUIT \n");
while (fgets(selection, LSIZE, stdin) != NULL) {
puts(selection);
}
if(scanf("%i", &selection) != 1) {
printf("\nInvalid input\n");
return EXIT;
} else {
switch(*selection) {
case '1':
printf("Selected option 1\n");
break;
case '2':
printf("Selected option 2\n");
break;
default:
printf("invalid option, try again \n");
}
}
} while (*selection != '3');
exit();
}

Answer 1

int selection[LSIZE];
...
while (fgets(selection, LSIZE, stdin) != NULL) {
puts(selection);
}
...
if(scanf("%i", &selection) != 1) {
This is very confused. You've declared selection as an array of int, but you're reading a string into it as though it were an array of char, and then you're trying to read a single decimal integer into it, but you're passing the address of the array, not a single int element.
Let's simplify it a bit and only worry about reading the menu option. We'll read it as an int, so we'd change our code as follows:
int selection;
do
{
// print menu options
if ( scanf( "%d", &selection ) != 1 )
// handle bad input
else
{
switch( selection )
{
case 1 : // not '1'
// handle option 1
break;
case 2:
// handle option 2
break;
default:
break;
}
} while ( selection != 3 );
etc. This should get you past your initial hurdles.

Answer 2

This is what I ended up doing:
int main(void) {
int selection;
do {
printf("\n Welcome to Menu");
printf("1) option 1\n");
printf("2) option 2\n");
printf("3) QUIT \n");
if(scanf("%d", &selection) != 1) {
printf("\nInvalid input\n");
return EXIT;
} else {
switch(selection) {
case 1:
printf("Selected option 1\n");
break;
case 2:
printf("Selected option 2\n");
break;
default:
printf("invalid option, try again \n");
}
}
} while (*selection != '3');
exit();
}