Compilare: user.cpp: In function ‘int main()’: user.cpp:44:37: warning: unused variable ‘out’ [-Wunused-variable] FILE *in =fopen("ssnd.in","r"),*out=fopen("ssnd.out","w"); ^ user.cpp:46:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&nr); ^ user.cpp:50:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&x); ^