counting identifiers,no.of inputs and outputs

Hi,
my name is jyothi.iam doing my miniproject the title is 'evaluation of complexity measure using cognitive metrics'.actually i want to take the program as input and i want to find out
1.no.of identifiers
2.no.of unique lines containing identifiers
3.no.of identifiers in the set of unique lines
4.no.of inputs and outputs
5.according to control structures in the program i want to assign a value to control structures,how to find this........

if i calculate dis i can do my project dis is the basic for me..........

can any one help me abt this by giving guidelines or anything ............its urgent plsssssssss
iam trying dis but iam not getting.......

plsssssss any one tell me it can be java

for example
#include<stdio.h>
void main()
{
int a,b,c;
float d;
printf("enter a,b,c value");
scanf("%d %d %d",&a,&b,&c);
d=a+b+c;
getch();
}

through files i vil take the above program as input and i want to count identifiers for example the identifiers are 4(a,b,c,d)
no.of input is 1
no.of output is 1

we can do manually but
the calculation i want to do in program but how to count the identifiers,inputs,outputs etc..........