Skip to content

Instantly share code, notes, and snippets.

@xcvista xcvista/quesgen.c
Created Mar 22, 2014

Embed
What would you like to do?
/*
* quesgen.c - Math question generator for elementary school pupils
* Copyright (c) 2014 Maxthon Chan <xcvista@me.com>
*
* Compiling this program: Use your preferred C99 compiler. clang/LLVM is
* preferred, GCC is acceptable, MSVC is not guaranteed to work.
* clang quesgen.c -std=c99 -o quesgen
* No special library other than standard C library is required.
*
* Using this program:
* ./quesgen [count] > output.txt
* By default, it generates 100 questions.
*
* License:
*
* You are allowed to use, modify, copy and distribute this software, as long as
* you:
* 1) Keep the copyright notice, this license and the following disclaimer
* in your modified and/or distributed source code,
* 2) Keep the copyright notice, this license and the following disclaimer
* with your modified and/or distributed binary code.
* 3) Not claim your modified version of this program a work of its original
* author(s) unless explicitedly allowed.
*
* Disclaimer:
*
* THIS SOFTWARE IS PROVIDED TO YOU ON THE "AS-IS" BASIS. NO WARRANTY WHATSOEVER
* IS PROVIDED OR GUARANTEED FROM THE AUTHORS OF THIS SOFTWARE, INCLUDING BUT
* NOT LIMITED TO SUITABILITY OF MERCHANT, ABILITY TO SUPPORT CRITICAL SYSTEMS
* OR ANY SPECIFIC USE CASE. YOU ARE USING THIS SOFTWARE AT YOUR OWN RISK. WE
* AUTHORS TRY OUR BEST TO PREVENT PERCIEVEABLE ISSUES IN THIS SOFTWARE, BUT
* WE CANNOT GUARANTEE IT IS ERROR-FREE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main(int argc, char *const *argv)
{
int count = 100;
int a, b, sym;
if (argc > 1) // Handle the sole argument, if exists.
{
count = atoi(argv[1]);
}
if (count <= 0) // Handle bad argument...
{
count = 100; // ... by ignoring it.
}
srand(time(NULL)); // Initialize PRNG.
for (int i = 0; i < count; i++)
{
sym = rand() & 0x3; // Generate the symbol. Faster this way.
if (sym == 3) // Division is handled differently.
{
a = rand() % 30 + 1;
b = rand() % 30 + 1;
printf("%d / %d =\n", a * b, b);
}
else // Other three is trivial.
{
static const char syms[] = "+-*"; // Faster this way.
a = rand() % 100 + 1;
b = rand() % 100 + 1;
printf("%d %c %d =\n", a, syms[sym], b);
}
}
return EXIT_SUCCESS;
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.