Compilare: user.c: In function ‘fact’: user.c:10:5: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while(k2=*p) ^ user.c:34:20: warning: statement with no effect [-Wunused-value] j==4; ^ user.c:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:48:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp,"%d",&p); ^