(C++) Function not declaring - c++

Question

I'm new to SDL, and I have a function bool init(). I've been learning SDL 2.0 from lazyfoot.net for a few days without a problem. I've been essentially copying their code, and today I tried to do my own. (EDIT: I know someone said I have an outdated header file. This is not the case, because I have been able to use SDL_WINDOWPOS_UNDEFINED and other 2.0 features ever since I installed the library) For whatever reason, this won't work.
I'm using Windows 7 Starter, with Code::Blocks (MinGW as my compiler)
When I (try to) build and run, there is a red flag next to line 17, which is this.
bool init() {
Here is the entire source code.
#include <iostream>
#include <SDL.h>
const int SCREEN_WIDTH = 500;
const int SCREEN_HEIGHT = 500;
bool init();
bool loadMedia();
void quit();
int time = 5000;
SDL_Window* window = NULL;
SDL_Surface* surface = NULL;
SDL_Surface* topImage = NULL;
bool init() {
bool success = true;
if(SDL_Init(SDL_INIT_VIDEO) < 0) {
std::cout << SDL_GetError() << std::endl;
success = false;
}
else{
SDL_CreateWindow("My Window", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
if(window == NULL) {
std::cout << SDL_GetError() << std::endl;
success = false;
}
}
return success;
}
bool loadMedia() {
bool success = true;
surface = SDL_GetWindowSurface(window);
if(surface == NULL) {
std::cout << SDL_GetError() << std::endl;
success = false;
}
else {
topImage = SDL_LoadBMP("image.bmp");
if(topImage = NULL) {
std::cout << SDL_GetError() << std::endl;
success = false;
}
else {
SDL_BlitSurface(topImage, NULL, surface, NULL);
SDL_UpdateWindowSurface(window);
SDL_Delay(time);
}
}
return success;
}
void quit() {
SDL_FreeSurface(topImage);
topImage = NULL;
SDL_DestroyWindow(window);
window = NULL;
surface = NULL;
SDL_Quit();
}
int main(int argc, char* args[]) {
if(init() == true) {
init();
if(loadMedia() == true) {
loadMedia();
}
}
quit();
return 0;
}

Answer 1

You are getting this error:
error: 'SDL_WINDOWPOS_UNDEFINED' was not declared in this scope
which means that your including headers for an older version of SDL. but SDL_WINDOWPOS_UNDEFINED is defined in the SDL 2.0 version.
Just make sure to include the right headers which you can download them from the official library website: http://www.libsdl.org/download-2.0.php