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#define WIDTH 320
 
#define HEIGHT 240
 
 
 
#include<stdio.h>
 
#include<stdlib.h>
 
 
 
typedef struct color{
 
    unsigned char r;
 
	unsigned char g;
 
	unsigned char b;
 
}COLOR;
 
 
 
COLOR data[WIDTH][HEIGHT];
 
COLOR data2[WIDTH][HEIGHT] = {0};
 
unsigned char graydata[WIDTH][HEIGHT];
 
int filter[3][3] = {{ -1, -1, -1 },
 
                       { -1, 8, -1 },
 
                       { -1, -1, -1}};
 
 
 
int main(){
 
	int i, j, ii, jj;
 
	int red, green, blue;
 
	FILE *fp;
 
	FILE *out;
 
 
 
	char header[54];
 
 
 
	//エラー処理
 
	if((fp = fopen("image2.bmp", "rb")) == NULL){
 
		fprintf(stderr, "file open error");
 
		exit(1);
 
	}
 
	if((out = fopen("out.bmp", "wb")) == NULL){
 
		fprintf(stderr, "file open error");
 
		exit(1);
 
	}
 
 
 
	fread(header, 1, 54, fp);
 
 
 
	for(j=HEIGHT-1; j>=0; j--){
 
		for(i=0; i<WIDTH; i++){
 
			data[i][j].b = getc(fp);
 
			data[i][j].g = getc(fp);
 
			data[i][j].r = getc(fp);
 
		}
 
	}
 
 
 
	fclose(fp);
 
 
 
	//グレースケール
 
	for(i=0; i<WIDTH; i++){
 
		for(j=0; j<HEIGHT; j++){
 
			graydata[i][j] = (data[i][j].r + data[i][j].g + data[i][j].b)/3;
 
		}
 
	}
 
 
 
	//エッジ抽出
 
	for(j=0; j<HEIGHT; j++){
 
		data2[0][j].r = graydata[0][j].r;
 
		data2[0][j].g = graydata[0][j].g;
 
		data2[0][j].b = graydata[0][j].b;
 
	}
 
	for(i=1; i<WIDTH-1; i++){
 
		data2[i][0].r = graydata[i][0].r;
 
		data2[i][0].g = graydata[i][0].g;
 
		data2[i][0].b = graydata[i][0].b;
 
		for(j=1; j<HEIGHT-1; j++){
 
			red = 0, green = 0, blue = 0;
 
			for(ii=0; ii<3; ii++){
 
				for(jj=0; jj<3; jj++){
 
					red += graydata[i+ii-1][j+jj-1].r * filter[ii][jj];
 
					green += graydata[i+ii-1][j+jj-1].g * filter[ii][jj];
 
					blue += graydata[i+ii-1][j+jj-1].b * filter[ii][jj];
 
				}
 
			}
 
			//0未満の値は0に、255超える値を255にする
 
			if(red < 0) red = 0;
 
			else if(red > 255) red = 255;
 
			if(green < 0) green = 0;
 
			else if(green >255) green = 255;
 
			if(blue < 0) blue = 0;
 
			else if(blue > 255) blue = 255;
 
 
 
			data2[i][j].r = red;
 
			data2[i][j].g = green;
 
			data2[i][j].b = blue;
 
		}
 
		data2[i][HEIGHT-1].r = graydata[i][HEIGHT-1].r;
 
		data2[i][HEIGHT-1].g = graydata[i][HEIGHT-1].g;
 
		data2[i][HEIGHT-1].b = graydata[i][HEIGHT-1].b;
 
	}
 
	for(j=0; j<HEIGHT; j++){
 
		data2[WIDTH-1][j].r = graydata[WIDTH-1][j].r;
 
		data2[WIDTH-1][j].g = graydata[WIDTH-1][j].g;
 
		data2[WIDTH-1][j].b = graydata[WIDTH-1][j].b;
 
	}
 
 
 
	fwrite(header, 1, 54, out);
 
 
 
	//出力
 
    for(j=HEIGHT-1; j>=0; j--){
 
        for(i=0; i<WIDTH; i++){
 
			fputc(data2[i][j].b, out);
 
			fputc(data2[i][j].g, out);
 
			fputc(data2[i][j].r, out);
 
		}
 
	}
 
	fclose(out);
 
 
 
	return 0;
 
}

prog.cpp:27: warning: missing braces around initializer for ‘COLOR [240]’
prog.cpp:27: warning: missing braces around initializer for ‘COLOR’
prog.cpp: In function ‘int main()’:
prog.cpp:117: error: request for member ‘r’ in ‘graydata[0][j]’, which is of non-class type ‘unsigned char’
prog.cpp:119: error: request for member ‘g’ in ‘graydata[0][j]’, which is of non-class type ‘unsigned char’
prog.cpp:121: error: request for member ‘b’ in ‘graydata[0][j]’, which is of non-class type ‘unsigned char’
prog.cpp:127: error: request for member ‘r’ in ‘graydata[i][0]’, which is of non-class type ‘unsigned char’
prog.cpp:129: error: request for member ‘g’ in ‘graydata[i][0]’, which is of non-class type ‘unsigned char’
prog.cpp:131: error: request for member ‘b’ in ‘graydata[i][0]’, which is of non-class type ‘unsigned char’
prog.cpp:141: error: request for member ‘r’ in ‘graydata[((i + ii) + -0x000000001)][((j + jj) + -0x000000001)]’, which is of non-class type ‘unsigned char’
prog.cpp:143: error: request for member ‘g’ in ‘graydata[((i + ii) + -0x000000001)][((j + jj) + -0x000000001)]’, which is of non-class type ‘unsigned char’
prog.cpp:145: error: request for member ‘b’ in ‘graydata[((i + ii) + -0x000000001)][((j + jj) + -0x000000001)]’, which is of non-class type ‘unsigned char’
prog.cpp:175: error: request for member ‘r’ in ‘graydata[i][239]’, which is of non-class type ‘unsigned char’
prog.cpp:177: error: request for member ‘g’ in ‘graydata[i][239]’, which is of non-class type ‘unsigned char’
prog.cpp:179: error: request for member ‘b’ in ‘graydata[i][239]’, which is of non-class type ‘unsigned char’
prog.cpp:185: error: request for member ‘r’ in ‘graydata[319][j]’, which is of non-class type ‘unsigned char’
prog.cpp:187: error: request for member ‘g’ in ‘graydata[319][j]’, which is of non-class type ‘unsigned char’
prog.cpp:189: error: request for member ‘b’ in ‘graydata[319][j]’, which is of non-class type ‘unsigned char’
prog.cpp:75: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result
prog.cpp:195: warning: ignoring return value of ‘size_t fwrite(const void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result

Standard output is empty