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#ifndef __BITMAP__LIB__
#define __BITMAP__LIB__
 
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#define BITS_PER_BYTE 8
#pragma pack(push, 1)
 
struct Pixel {
	uint8_t B, G, R;
};
 
struct BitmapHeader {
	uint16_t bmType;
	uint32_t bmSize;
	uint16_t bmReserve1;
	uint16_t bmReserve2;
	uint32_t bmPixArrayOffset;
};
 
struct BitmapDIB {
	uint32_t headerSize;
	int32_t bmWidth;
	int32_t bmHeight;
	uint16_t nPlanes;
	uint16_t bitDepth;
	uint32_t compressionMode;
	uint32_t dataSize;
	int32_t xPixPerM;
	int32_t yPixPerM;
	uint32_t nColorPalette;
	uint32_t nColorImportant;
};
 
struct Bitmap{
	BitmapHeader header;
	BitmapDIB dib;
	uint8_t* data;
	uint32_t rowSize;
 
	Pixel& operator()(uint32_t x, uint32_t y) {
		// data != null
		uint8_t* pointer = data + x*rowSize + y*dib.bitDepth / BITS_PER_BYTE;
 
		return *((Pixel*)pointer);
	}
 
	Pixel operator()(uint32_t x, uint32_t y) const {
		// data != null
		uint8_t* pointer = data + x*rowSize + y*dib.bitDepth / BITS_PER_BYTE;
 
		return *((Pixel*)pointer);
	}
};
 
#pragma pack(pop)
 
 
void freeBitmap(Bitmap*);
 
Bitmap* newBitmapFromFile(const char*);
 
bool writeBitmapToFile(const char*, Bitmap*);
 
void setRowSize(Bitmap*);
 
#endif // __BITMAP__LIB__

Main.java:1: error: illegal character: '#'
#ifndef __BITMAP__LIB__
^
Main.java:2: error: illegal character: '#'
#define __BITMAP__LIB__
^
Main.java:4: error: illegal character: '#'
#include <stdio.h>
^
Main.java:5: error: illegal character: '#'
#include <stdint.h>
^
Main.java:6: error: illegal character: '#'
#include <stdlib.h>
^
Main.java:7: error: illegal character: '#'
#define BITS_PER_BYTE 8
^
Main.java:8: error: illegal character: '#'
#pragma pack(push, 1)
^
Main.java:12: error: class, interface, or enum expected
};
^
Main.java:14: error: class, interface, or enum expected
struct BitmapHeader {
^
Main.java:16: error: class, interface, or enum expected
	uint32_t bmSize;
	^
Main.java:17: error: class, interface, or enum expected
	uint16_t bmReserve1;
	^
Main.java:18: error: class, interface, or enum expected
	uint16_t bmReserve2;
	^
Main.java:19: error: class, interface, or enum expected
	uint32_t bmPixArrayOffset;
	^
Main.java:20: error: class, interface, or enum expected
};
^
Main.java:22: error: class, interface, or enum expected
struct BitmapDIB {
^
Main.java:24: error: class, interface, or enum expected
	int32_t bmWidth;
	^
Main.java:25: error: class, interface, or enum expected
	int32_t bmHeight;
	^
Main.java:26: error: class, interface, or enum expected
	uint16_t nPlanes;
	^
Main.java:27: error: class, interface, or enum expected
	uint16_t bitDepth;
	^
Main.java:28: error: class, interface, or enum expected
	uint32_t compressionMode;
	^
Main.java:29: error: class, interface, or enum expected
	uint32_t dataSize;
	^
Main.java:30: error: class, interface, or enum expected
	int32_t xPixPerM;
	^
Main.java:31: error: class, interface, or enum expected
	int32_t yPixPerM;
	^
Main.java:32: error: class, interface, or enum expected
	uint32_t nColorPalette;
	^
Main.java:33: error: class, interface, or enum expected
	uint32_t nColorImportant;
	^
Main.java:34: error: class, interface, or enum expected
};
^
Main.java:36: error: class, interface, or enum expected
struct Bitmap{
^
Main.java:38: error: class, interface, or enum expected
	BitmapDIB dib;
	^
Main.java:39: error: class, interface, or enum expected
	uint8_t* data;
	^
Main.java:40: error: class, interface, or enum expected
	uint32_t rowSize;
	^
Main.java:42: error: class, interface, or enum expected
	Pixel& operator()(uint32_t x, uint32_t y) {
	^
Main.java:46: error: class, interface, or enum expected
		return *((Pixel*)pointer);
		^
Main.java:47: error: class, interface, or enum expected
	}
	^
Main.java:53: error: class, interface, or enum expected
		return *((Pixel*)pointer);
		^
Main.java:54: error: class, interface, or enum expected
	}
	^
Main.java:57: error: illegal character: '#'
#pragma pack(pop)
^
Main.java:57: error: class, interface, or enum expected
#pragma pack(pop)
        ^
Main.java:62: error: class, interface, or enum expected
Bitmap* newBitmapFromFile(const char*);
^
Main.java:64: error: class, interface, or enum expected
bool writeBitmapToFile(const char*, Bitmap*);
^
Main.java:66: error: class, interface, or enum expected
void setRowSize(Bitmap*);
^
Main.java:68: error: illegal character: '#'
#endif // __BITMAP__LIB__
^
Main.java:68: error: reached end of file while parsing
#endif // __BITMAP__LIB__
                         ^
42 errors

Standard output is empty