Compilare: user.cpp: In function ‘int main()’: user.cpp:127:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(&bmpFileHeader, 14, 1, input); ^ user.cpp:128:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(&bmpInfoHeader, 40, 1, input); ^ user.cpp:136:48: 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); ^