Compilare: user.cpp: In function ‘int main()’: user.cpp:141:30: warning: suggest parentheses around comparison in operand of ‘!=’ [-Wparentheses] if(b != 255 || g != 255 != r != 255) ^ user.cpp:141:37: warning: suggest parentheses around comparison in operand of ‘!=’ [-Wparentheses] if(b != 255 || g != 255 != r != 255) ^ user.cpp:124:19: warning: variable ‘output’ set but not used [-Wunused-but-set-variable] FILE *input, *output; ^ user.cpp:131:67: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(&bmpFileHeader, sizeof(struct bmp_fileheader), 1, input); ^ user.cpp:132:67: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(&bmpInfoHeader, sizeof(struct bmp_infoheader), 1, input); ^ user.cpp:140:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%c%c%c", &b, &g, &r); ^