Compilare: user.cpp: In function ‘int main()’: user.cpp:27:14: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin>> s1 + 1; ^ user.cpp:28:14: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin>> s2 + 1; ^ user.cpp:29:14: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin>> s3 + 1; ^