[Dev-C++] & and *

[Jeeun C. <koo...@ya...>]

void
getData(int&lengCo,int&lengGro,string&comet,string&group);
void Convert(int lengCo,int lengGro,string
comet,string
group,vector<int>&ComNum,vector<int>&GroNum);
void
modNum(int&modCom,int&modGro,vector<int>ComNum,vector<int>GroNum,int
lengCo,int lengGro);

this is the part of my program...and...i did as i was
taught in my c++ class at school..(using & when the
variable is changable)..
however, i found out that people are using * instead
of & when i read their mails. 
what should i use? & or *?
cuz when i chaged & to * and compiled, i got lotta
errors, and when i used & and compiled, there wasn't
any errors...


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