Compilare: user.cpp: In function ‘int main()’: user.cpp:10:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d%d", &p, &n); ^ user.cpp:12:25: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(s1, 1, 12, fi); ^ user.cpp:18:29: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(str, 1, 5, fi); ^ user.cpp:37:29: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] fputc(s1[nr / k - 1], fo); ~~~^~~