Compilare: user.cpp: In function ‘int main()’: user.cpp:13:11: warning: unused variable ‘fout’ [-Wunused-variable] FILE *fout=fopen("trompeta.out", "w"); ^ user.cpp:19:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%c",&n,&m,&ch); ^ user.cpp:20:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(input, n+1, fin); ^