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What Is Linker ?
飪榗ombines two or more separate object programs
and supplies the information needed to allow
references between them

Role of linker
Source
Program
Assembler
Object
Program
Linker
Executable
Code
Loader
Memory
Object
program
ready for
execution

Program
Input :
1. P1.txt
extern x, y, z
2. P2.txt
200 int x
201 int y
202 int z

// SIMULATION OF LINKER
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<string.h>
#include<math.h>
#include<stdlib.h>
struct x
{
char f[10];
}s[20],t[20],r[10];

void main()
{
clrscr();
x o[2]={"int","float"};
x z[20],v[20];
char c,*a,*b;
int i=0, j=0, k=0, l=0, flag=0, flag1=0, h=0, y=0, u=0;
int m;
FILE *p1,*p2;
p1=fopen("p1.txt","r");
p2=fopen("p2.txt","r");

do
{
c=fgetc(p1);
if(c!=' '&&c!='n'&&c!=',')
{
a[i]=c;
i++;
}
else
{
a[i]='0';
strcpy(s[j].f,a);
j++;
i=0;
k++; }
}while(c!=EOF);

i=0;
j=0;
do
{
c=fgetc(p2);
if(c!=' '&& c!='n')
{
if((abs(c)>=65&&abs(c)<=90)||(abs(c)>=97&&abs(c)
<=122))
{
a[i]=c; //insert characters e.g.int x
i++;
flag=1;
}

else
{
b[h]=c; //insert digits e.g. 200
h++;
flag1=1;
}
}
else
{
if(flag==1) //For characters
{
a[i]='0';
strcpy(t[j].f,a);
j++;
i=0; l++; //counter

}
if(flag1==1) // For Digits
{
b[h]='0';
strcpy(r[y].f,b);
y++;
h=0;
u++; //counter
}
}
}while(c!=EOF);
h=0;

for(i=0;i<l;i++)
{
flag=0;
for(j=0;j<2;j++) //for characters
{
if(strcmp(t[i].f,o[j].f)==0||strcmp(t[i].f,"")==0)
{
flag=1;
}
}
if(flag==0)
{
strcpy(v[h].f,t[i].f );
h++;
} }

l=0;
for(i=0;i<u;i++) //for digits
{
if(strcmp(r[i].f,"")!=0)
{
strcpy(z[l].f,r[i].f );
l++;
}
}
cout<<"n***After Linking****n";
flag=0;
l=0;

for(i=0;i<k;i++)
{
flag=0;
for(j=0;j<h;j++)
{
if(strcmp(s[i].f,v[j].f)==0)
flag=1;
}
if(flag==1)
{
m=atoi(z[l].f)+400;
cout<<s[i].f<<" "<<"p1"<<" "<<m<<"n";
l++;
}

}
fclose(p1);
fclose(p2);
getch();
}

P1.txt
extern x, y, z;
P2.txt
200 int x
201 int y
202 int z
After Linking
x p1 600
y p1 601
z p1 602

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