getting paragraph without using gets() function

• This is my code...
• This will executing infinte times...
• can any help me to getting the paragraph without gets()

char str[100];int i=0; for(cin>>str[i];str[i]!='\n';) {++i; cin>>str[i]; }

• If i use gets()function in cstring, iam getting the error like gets() function is out of scope..