C program for Pass-1 Assembler

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int symi=0,lc=0,len=1,dc=0,start=0;
struct pgm
{
char line[80];
} s[100];
struct symtab
{
char name[10];
int add;
} sym[100];
void show(char* a,char* b,char* c)
{
printf("%8s %5s %6s \n",a,b,c);
}
void check(char s[])
{
if(!strcmpi(s,"START"))
{
start=1;
show("","START","1");
return;
}
if(!strcmpi(s,"END"))
{
show("","END","1");
return;
}
if(!strcmpi(s,"EQU"))
{
show("","EQU","1");
return;
}
if(!strcmpi(s,"DS"))
{
show("","DS","1");
return;
}
if(!strcmpi(s,"ORG"))
{
show("","ORG","1");
return;
}
if(!strcmpi(s,"DC"))
{
show("","DC","1");
return;
}
if(start)
{
start=0;
lc=atoi(s);
return;
}
if(dc)
{
dc=0;
len=atoi(s);
show("","DS",s);
return;
}
for(int i=0;i<symi;i++)
{
if(strcmp(sym[i].name,s)==0)
return;
}
if(s[0]=='\'')
{
char p[2];
sprintf(p,"LIT : %s",s);
show(p,"-","-");
return;
}
strcpy(sym[symi++].name,s);
show(s,"-","-");
return;
}
void main()
{
char t[20];
int i=0,j=0,k=0;
cout<<"Enter the Program code:";
do
{
gets(s[i].line);
}
while(strcmpi(s[i++].line,"end"));
printf("Systab Optab Length \n");
printf("---------------------");
k=-1;
do
{
k++;
for(i=0;s[k].line[i]!='\o';i++,j++)
{
if(s[k].line[i]==' ')
{
t[j]='\o';
j=-1;
check(t);
}
else
t[j] = s[k].line[i];
}
t[j]='\o';
j=0;
check(t);
}
while(strcmpi(s[k].line,"End"));
getch();
}

#include<iostream.h> #include<conio.h> #include<stdio.h> #include<stdlib.h> #include<string.h> int symi=0,lc=0,len=1,dc=0,start=0; struct pgm { char line[80]; } s[100]; struct symtab { char name[10]; int add; } sym[100]; void show(char* a,char* b,char* c) { printf("%8s %5s %6s \n",a,b,c); } void check(char s[]) { if(!strcmpi(s,"START")) { start=1; show("","START","1"); return; } if(!strcmpi(s,"END")) { show("","END","1"); return; } if(!strcmpi(s,"EQU")) { show("","EQU","1"); return; } if(!strcmpi(s,"DS")) { show("","DS","1"); return; } if(!strcmpi(s,"ORG")) { show("","ORG","1"); return; } if(!strcmpi(s,"DC")) { show("","DC","1"); return; } if(start) { start=0; lc=atoi(s); return; } if(dc) { dc=0; len=atoi(s); show("","DS",s); return; } for(int i=0;i<symi;i++) { if(strcmp(sym[i].name,s)==0) return; } if(s[0]=='\'') { char p[2]; sprintf(p,"LIT : %s",s); show(p,"-","-"); return; } strcpy(sym[symi++].name,s); show(s,"-","-"); return; } void main() { char t[20]; int i=0,j=0,k=0; cout<<"Enter the Program code:"; do { gets(s[i].line); } while(strcmpi(s[i++].line,"end")); printf("Systab Optab Length \n"); printf("---------------------"); k=-1; do { k++; for(i=0;s[k].line[i]!='\o';i++,j++) { if(s[k].line[i]==' ') { t[j]='\o'; j=-1; check(t); } else t[j] = s[k].line[i]; } t[j]='\o'; j=0; check(t); } while(strcmpi(s[k].line,"End")); getch(); }