Compilare: main.cpp: In function 'int main()': main.cpp:17:53: warning: operation on 'par' may be undefined [-Wsequence-point] case 2: fprintf(g, "%d %d\n", par--, par--); break; ~~~^~ main.cpp:18:63: warning: operation on 'imp' may be undefined [-Wsequence-point] case 3: fprintf(g, "%d %d %d\n", imp++, imp++, imp++); break; ~~~^~ main.cpp:18:63: warning: operation on 'imp' may be undefined [-Wsequence-point] main.cpp:8:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &m); ^ main.cpp:13:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^