prototype means in c++ iam getting confused in it asit is not compiling

[elis dezuza]

iam making program of case conversion so iam getting error that function upper case should have a prototype.
#include<iostream.h>
#include<conio.h>
#include<ctype.h>
main()
{
char a,b,c;
cout<<"enter the first value";
cin>>a;
b=uppercase(a)
a=lower case(b)
get ch();
return(0);
}

[weaknessforcats]

Your function cannot be "lower case". It has to be one word.

Also, do you mean to change a to upper case and put the result in b? If so, the function is toupper. Ditto for tolower for lower case.

Post again let me know what happened.