If you want to create a chatbot/auto replay system use the c program just use this code:
Copy below code and save use extension .c. example, filename.c.
#include <stdio.h>
#include <string.h>
int main()
{
char question[100];
printf("Hello sir, \nWelcome to our Caffe chatbox. How can we help you?\n");
printf("---------------------------------------------------\n");
START:
printf("\nEnter Your Question:\n");
gets(question);
if(strcmp(question,"hi") == 0 || strcmp(question,"hello") == 0)
{
printf("Hello sir, How can we help you?\n");
}
else if(strcmp(question,"how are you") == 0 || strcmp(question,"how are you?") == 0)
{
printf("I am fine! you?\n");
}
else if(strcmp(question,"bye") == 0)
{
goto EXIT;
}
else
{
printf("Sorry sir. I can't understand what you want to say.\n");
printf("do you have any question?\n");
gets(question);
if(strcmp(question,"yes") == 0 )
{
goto START;
}
else if(strcmp(question,"no") == 0)
{
goto EXIT;
}
}
goto START;
EXIT:
printf("Thank you so much for contact us. Bye\n\n");
return 0;
}
I am using if-else and goto conditions. also use strcmp() function to compare two strings.
C program auto replay chatbot Screen Shoot:

You can also use this code to create chatbot in c program:
#include <stdio.h>
#include <string.h>
int main() {
char a[100], b[100];
char temp[10]="hi",temp2[10] = "hello";
printf("Enter your question.\n");
gets(a);
if (strcmp(a,temp) == 0)
printf("Hello sir. Welcome to our Caffe chatbox. How can we help you?\n");
else
printf("Sorry sir. It's not available in our service.\n");
return 0;
}
In this code, I am using an array for listing questions.
I hope this code helps you to create a chatbot or auto replay system use c program.