User-Defined function for reading input not working - c

Question

I've made a user-defined function for reading input and replacing newline character '\n' with '\0' so when I use printf statement for printing the string it won't add newline at the end.
char xgets(char *line, int size, FILE *stdn)
{
//READS THE LINE
fgets(line, size, stdn);
//REMOVES NEWLINE CHARACTER '\n' AND ADDS '\0'
line[strcspn(line, "\n")] = '\0';
return line;
}
When I call xgets inside main() function it works properly, but when it is called in other user-defined function it does not wait for user-input.
I'm using Visual Studio 2015 for debugging my code.
Here's my code:
#include<stdio.h>
#include<stdlib.h>
#include<process.h>
//USER-DEFINED FUNCTION
char xgets(char *line, int size, FILE *stdn);
void sortm_hgrade();
void sortm_rcharge();
void header(void);
void header(void)
{
printf("*-*-*-*-*HOTEL_INFO*-*-*-*-*");
printf("\n\n");
}
char xgets(char *line, int size, FILE *stdn)
{
//READS THE LINE
fgets(line, size, stdn);
//REMOVES NEWLINE CHARACTER '\n' AND ADDS '\0' END LINE CHARACTER
line[strcspn(line, "\n")] = '\0';
return line;
}
#define MAX 1000
//PROGRAMS STARTS HERE
int main(void)
{
//VARIABLE-DECLARATION
int i = 0, j = 0, n = 0;
char line[MAX] = { 0 };
char o = { 0 };
char h[10] = { 0 };
//FUCNTION CALL-OUT
header();
printf("Type anything : ");
xgets(h, sizeof(h), stdin);
printf("Enter one option from the following : \n\n");
printf("(a) To Print out Hotels of a given Grade in order of charges. \n");
printf("(b) To Print out Hotels with Room Charges less than a given Value. \n");
printf("Please type a proper option. \n");
while (n == 0){
scanf_s(" %c", &o);
switch (o){
case 'a':
sortm_hgrade();
n = 1;
break;
case 'b':
sortm_rcharge();
n = 1;
break;
default:
printf("Option INVALID \n");
printf("Please type a proper option \n");
n = 0;
break;
}
}
//TERMINAL-PAUSE
system("pause");
}
void sortm_hgrade()
{
//FOR SORTING BY GRADE
char g[10] = { 0 };
printf("Enter the Grade : ");
xgets(g, sizeof(g), stdin);
printf("\n");
}
void sortm_rcharge()
{
printf("----");
}

Answer 1

You should change
scanf(" %c", &o);
to
scanf("%c ", &o);
This force scanf to consume trailing chars, like '\n'
In your code '\n' of user input for scanf %c is not consumed and it is consumed by fgets in your xgets function that exit immediately with an empty buffer.
BTW that solution can wok only if a single char is input by user.
Best code would be
char c;
while (n == 0)
{
o = getchar();
while ((c = getchar()) != EOF && c != '\n') ;
EDIT
With the second solution code is waiting, and discarding, chars until a '\n' is triggered or end of file. In your specific case (using stdin as console) EOF is not mandatory. It will be mandatory in case of input is being read from a "real file".

Answer 2

You need to skip the \n character after you take in a character. you can command scanf for that. fgets reads that newline character up first and then hence it terminates. use this
scanf(" %c *[^\n]", &o);
This should do the trick