Compilare: user.cpp: In function ‘void main2()’: user.cpp:33:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&m); ^ user.cpp:39:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&a,&b); ^ user.cpp: In function ‘int main()’: user.cpp:89:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&t); ^ user.cpp: In function ‘void main2()’: user.cpp:76:5: warning: ‘act’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(p<act) ^