c++ - Identifier not found when it's not meant to be an identifier? -

i have defined function called decryptionarchive() this:

string decryptionarchive(char i) {  } 

can create function string identifier? i've search everywhere , have found creating pointers string data types. when run code:

string chartoadd = decryptionarchive(i[curr]); 

yes, have imported string, , using namespace std. 'i' string, issue? actual error code is

error c3861: 'decryptionarchive': identifier not found 

this error occurs on line 26, line of string chartoadd = decryptionarchive(i[curr]); doesn't make sense me. ideas? thanks

edit: ran on laptop, works fine! going on here?

you didn't declare array. treating array, yet isn't array.