Compilare: user.cpp: In function ‘int main()’: user.cpp:51:27: 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:89:2: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] switch(c) ^ user.cpp:53:9: warning: ‘mm’ may be used uninitialized in this function [-Wmaybe-uninitialized] int nn,mm,c,nr=0; ^ user.cpp:53:6: warning: ‘nn’ may be used uninitialized in this function [-Wmaybe-uninitialized] int nn,mm,c,nr=0; ^