Compilare: user.cpp: In function ‘int main()’: user.cpp:12:17: warning: suggest parentheses around comparison in operand of ‘!=’ [-Wparentheses] while (a!=b <30000) { ^ user.cpp:10:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&a); ^ user.cpp:11:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&b); ^