Compilare: user.cpp: In function ‘int main()’: user.cpp:28:18: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(top>0) if (s[top]!='(') top=0; ^ user.cpp:36:18: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(top>0) if (s[top]!='[') top=0; ^ user.cpp:44:18: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(top>0) if (s[top]!='{') top=0; ^ user.cpp:16:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d\n",&n); ^ user.cpp:19:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] { fscanf(f,"%c",&c); ^