Compilare: user.cpp: In function ‘int main()’: user.cpp:7:40: warning: unused variable ‘fout’ [-Wunused-variable] FILE *fin=fopen("nunta1.txt","r"),*fout=fopen("nunta2.txt","w"); ^ user.cpp:8:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^