Compiler design lab programs

Mukesh Kumar
1110751908
CSE 7th
Sem
Course: Bachelor of Technology
Branch: Computer Science & Engineering
Semester: 7th
GURU JAMBHESHWAR UNIVERSITY OF
SCIENCE & TECHNOLOGY, HISAR
Submitted To: - Submitted By:-
Er. Isha Nagpal Mukesh Kumar
Asstt. Professor in CSE Deptt. 1110751908
Department of Computer Science & Engineering
Prannath Parnami Institute of Management & Technology, Hisar
Prannath Parnami Universe, Website: ppu.edu.in

Mukesh Kumar
1110751908
CSE 7th
Sem
INDEX
Sr.
No.
Name of Experiment Date Sign.
1. Write a program to design lexical analyzer.
2. Write a program to generate three address codes
for assignment, arithmetic and relational
expressions.
3. Write a program to check whether a string to the
grammar or not.
4. Write a program to find the number of
whitespaces & newline characters.
5. Write a program to find the leading terminals.
6. Write a program to find the trailing terminals.
7. Write a program for computation of first.
8. Write a program to show the operations of stack.
9. Write a program to perform the operations on
stack by using linked list.
10. Write a program to perform the operations on file.

Mukesh Kumar
1110751908
CSE 7th
Sem
Program-01
Write a program to design lexical analyzer.
#include<ctype.h>
#include<stdio.h>
#include<string.h>
void keyword(char str[10])
{
if(strcmp("for",str)==0||strcmp("while",str)==0||
strcmp("do",str)==0||strcmp("int",str)==0||strcmp
("float",str)==0||strcmp("char",str)==0||strcmp
("double",str)==0||strcmp("static",str)==0||strcmp
("switch",str)==0||strcmp("case",str)==0)
printf("n%s is a keyword", str);
else
printf("n%s is an identifier", str);
}
void main()
{
FILE *f1,*f2,*f3;
char c,str[10],st1[10];
int num[100],lineno=0,tokenvalue=0,i=0,j=0,k=0;
printf("n enter the c program");
gets(st1);
f1=fopen("input.txt","w");
while((c=getchar())!=EOF)
putc(c,f1);
fclose(f1);
f1=fopen ("input.txt","r");
f2=fopen ("identifier.txt","w");
f3=fopen ("specialchar.txt","w");
while((c=getc(f1))!=EOF)
{
if(isdigit(c))
{
tokenvalue=c-'0';

Mukesh Kumar
1110751908
CSE 7th
Sem
c=getc(f1);
while(isdigit(c))
{
tokenvalue*=10+c-'0';
c=getc(f1);
}
num[i++]=tokenvalue;
ungetc(c,f1);
}
else
if(isalpha(c))
{
putc(c,f2);
c=getc(f1);
while(isdigit(c)||isalpha(c)||c=='_'||c=='$')
{
putc(c,f2);
c=getc(f1);
}
putc(' ',f2);
ungetc(c,f1);//to get unsigned char to the spcified stream
}
else
if(c==' '||c=='t')
printf("");
else
if(c=='n')
lineno++;
else
putc(c,f3);
}
fclose(f2);
fclose(f3);
fclose(f1);
printf("n the no's in the program are");
for(j=0;j<i;j++)
printf("%d",num[j]);
printf("n");
f2=fopen("identifier.txt","r");

Mukesh Kumar
1110751908
CSE 7th
Sem
k=0;
printf("the keyword and identifiers are:");
{
if(c!=' ')
str[k++]=c;
else
{
str[k]='0';
keyword(str);
k=0;
}
}
fclose(f2);
f3=fopen ("n Specialchar.txt","r");
printf("n special characters are");
printf("%c",c);
printf("n");
fclose(f3);
printf("Total no. os lines are: %d", lineno);
getch();
}

Mukesh Kumar
1110751908
CSE 7th
Sem
OUTPUT

Mukesh Kumar
1110751908
CSE 7th
Sem
Program-02
Write a program to generate three address code for assignment, arithmetic and
relational expressions.
#include<stdio.h>
#include<string.h>
int i,ch,j,l,addr=100;
char ex[10],exp[10],exp1[10],exp2[10],id1[5],op[5],id2[5];
void main()
{
clrscr();
while(1)
{
printf("n 1. Assignment Expression or Arithmetic Expression n 2. Relational or Expression n
3. Exit n Enter the choice:");
scanf("%d", &ch);
switch(ch)
{
case 1:
printf("n Enter the expression with Assignment Expression Operator or Arithmetic Operator:");
scanf("%s",exp);
l=strlen(exp);
exp2[0]='0';
i=0;
while(exp[i]!='=')
{
i++;
}
strncat(exp2,exp,i);
strrev(exp);
exp1[0]='0';
strncat(exp1,exp,l-(i+1));
strrev(exp1);
printf("three address code:ntemp=%sn%s=tempn",exp1,exp2);
break;
case 2:

Mukesh Kumar
1110751908
CSE 7th
Sem
printf("Enter the expression with relational operator");
scanf("%s%s%s",&id1,&op,&id2);
if(((strcmp(op,"<")==0)||(strcmp(op,">")==0)||(strcmp(op,"<=")
==0)||(strcmp(op,">=")==0)||(strcmp(op,"==")==0)||(strcmp(op,"!=")==0))==0)
printf("Expression is error");
else
{
printf("n %dtif%s%s%s goto %d",addr,id1,op,id2,addr+3);
addr++;
printf("n %dt T:=0",addr);
addr++;
printf("n %dt goto %d",addr,addr+2);
addr++;
printf("n %dt T:=1",addr);
}
break;
case 3:
exit(0);
}
}
}

Mukesh Kumar
1110751908
CSE 7th
Sem
Program-03
Write a program to check whether a string to the grammar or not.
#include<stdio.h>
#include<string.h>
#include<conio.h>
void main()
{
char a1[100],b1[100],c1[100],p1[10],s1;
int v=0,i,j,k,m,n=0,x,a=0,l1,l2,l3,loc,lx,lx1,loc1,s;
clrscr();
printf("enter the start symbol");
scanf("%c", & s1);
printf("enter the production");
scanf("%s",&a1);
printf("enter the string to be searching");
scanf("%s",&p1);
strcpy(b1,a1);
printf("b1=%s" ,b1);
l1=strlen(a1);
l2=strlen(b1);
l3=strlen(p1);
lx=l1;
lx1=l1;
printf("a1=%s", a1);
printf("l1=%d", l1);
while(((2*(13+2))>11))
{
for(i=0;i<11;i++)
{
if(a1[i]==s1)
{
loc=i;
}}
printf("n loc=%d", loc);
x=strcmp(a1,p1);
if(x==0)
{
printf("n string present");

Mukesh Kumar
1110751908
CSE 7th
Sem
}
else
{
l1=l1+l1;
for(j=loc;j<11;j++)
{
s=j+lx1;
a1[s]=a1[j];
}
printf("shift=%s",a1);
v=loc;
for(i=0;i<lx;i++)
{
a1[v]=b1[i];
v=v+1;
}
v=0;
m=0;
printf("string with start symbol=%s",a1);
for(j=0;j<=11;j++)
{
if(a1[j]!=s1)
{
a1[m]=a1[j];
m=m+1;
}}
printf("n string after removing start symbol=%s",a1);
}
if(x==0)
{
printf("nstring found");
break;
}}
if(x!=0)
{
printf("n string not found ");
}
getch();
}

Mukesh Kumar
1110751908
CSE 7th
Sem
Program-04
Write a program to find the number of whitespaces & newline characters.
#include<stdio.h>
#include<conio.h>
#include<string.h>
void main ()
{
char str[200],ch;
int a=0, space=0,newline=0;
clrscr();
printf("enter a string ( press escape to quit entering)");
ch=getche();
while((ch!=27)&&(a<199))
{
str[a]=ch;
if (str[a] ==' ')
{
space++;
}
if(str[a]==13)
{
newline++;
printf("n");
}
a++;
ch=getche();
}
printf("n the no. of lines used =%d", newline);
printf("n the no. of spaces used =%d", space);
getch();
}

Mukesh Kumar
1110751908
CSE 7th
Sem
Program-05
Write a program to find the leading terminals.
#include<stdio.h>
#include<string.h>
#include<conio.h>
int nt,t,top=0;
char s[50],NT[10],T[10],st[50],l[10][10],tr[50][50];
int searchnt(char a)
{
int count=-1,i;
for(i=0;i<nt;i++)
{
if(NT[i]==a)
return i;
}
return count;
}
int searchter(char a)
{
int count=-1,i;
for(i=0;i<t;i++)
{
if(T[i]==a)
return i;
}
return count;
}
void push(char a)
{
s[top]=a;
top++;
}
char pop()
{
top--;
return s[top];
}
void installl(int a,int b)

Mukesh Kumar
1110751908
CSE 7th
Sem
{
if(l[a][b]=='f')
{
l[a][b]='t';
push(T[b]);
push(NT[a]);
}}
void main()
{
int i,s,k,j,n;
char pr[30][30],b,c;
clrscr();
printf("Enter the no of production :");
scanf("%d",&n);
printf("Enter the productions one by onen");
for(i=0;i<n;i++)
scanf("%s", &pr[i]);
nt=0;
t=0;
for(i=0;i<n;i++)
{
if((searchnt(pr[i][0]))==-1)
NT[nt++]=pr[i][0];
}
for(i=0;i<n;i++){
for(j=3;j<strlen(pr[i]);j++){
if(searchnt(pr[i][j])==-1)
{
if(searchter(pr[i][j])==-1)
T[t++]=pr[i][j];
}}}
for(i=0;i<nt;i++){
for(j=0;j<t;j++)
l[i][j]='f';
}
for(i=0;i<nt;i++){
for(j=0;j<t;j++)
tr[i][j]='f';
}

Mukesh Kumar
1110751908
CSE 7th
Sem
for(i=0;i<nt;i++)
{
for(j=0;j<n;j++)
{
if(NT[(searchnt(pr[j][0]))]==NT[i])
{
if(searchter(pr[j][3])!=-1)
installl(searchnt(pr[j][0]),searchter(pr[j][3]));
else
{
for(k=3;k<strlen(pr[j]);k++){
if(searchnt(pr[j][k])==-1)
{
installl(searchnt(pr[j][0]),searchter(pr[j][k]));
break;
}}}}}}
while(top!=0)
{
b=pop();
c=pop();
for(s=0;s<n;s++){
if(pr[s][3]==b)
installl(searchnt(pr[s][0]),searchter(c));
}}
for(i=0;i<nt;i++)
{
printf("Leading %c:t{", NT[i] );
for(j=0;j<t;j++){
if(l[i][j]=='t')
printf("%c , ", T[j]);
}
printf("}n");
}
getch();
}

Mukesh Kumar
1110751908
CSE 7th
Sem
Program-06
Write a program to find the trailing terminals.
#include<stdio.h>
#include<string.h>
#include<conio.h>
int nt,t,top=0;
char s[50],NT[10],T[10],st[50],l[10][10],tr[50][50];
int searchnt(char a)
{
int count=-1,i;
for(i=0;i<nt;i++)
{
if(NT[i]==a)
return i;
}
return count;
}
int searchter(char a)
{
int count=-1,i;
for(i=0;i<t;i++)
{
if(T[i]==a)
return i;
}
return count;
}
void push(char a)
{
s[top]=a;
top++;
}
char pop()
{
top--;
return s[top];
}
void installt(int a,int b){

Mukesh Kumar
1110751908
CSE 7th
Sem
if(tr[a][b]=='f'){
tr[a][b]='t';
push(T[b]);
push(NT[a]);
}}
void main()
{
int i,s,k,j,n;
char pr[30][30],b,c;
clrscr();
printf("Enter the no of productions:");
scanf("%d",&n);
printf("Enter the productions one by onen");
for(i=0;i<n;i++)
scanf("%s",&pr[i]);
nt=0;
t=0;
for(i=0;i<n;i++){
if((searchnt(pr[i][0]))==-1)
NT[nt++]=pr[i][0];
}
for(i=0;i<n;i++)
{
for(j=3;j<strlen(pr[i]);j++)
{
if(searchnt(pr[i][j])==-1)
{
if(searchter(pr[i][j])==-1)
T[t++]=pr[i][j];
}}}
for(i=0;i<nt;i++){
for(j=0;j<t;j++)
l[i][j]='f';
}
for(i=0;i<nt;i++){
for(j=0;j<t;j++)
tr[i][j]='f';
}
for(i=0;i<nt;i++){

Mukesh Kumar
1110751908
CSE 7th
Sem
for(j=0;j<n;j++){
if(NT[(searchnt(pr[j][0]))]==NT[i])
{
if(searchter(pr[j][3])!=-1)
top=0;
for(i=0;i<nt;i++)
{
for(j=0;j<n;j++){
if(NT[searchnt(pr[j][0])]==NT[i])
{
if(searchter(pr[j][strlen(pr[j])-1])!=-1)
installt(searchnt(pr[j][0]),searchter(pr[j][strlen(pr[j])-1]));
else
{
for(k=(strlen(pr[j])-1);k>=3;k--)
{
if(searchnt(pr[j][k])==-1)
{
installt(searchnt(pr[j][0]),searchter(pr[j][k]));
break;
}}}}}}
while(top!=0)
{
b=pop();
c=pop();
for(s=0;s<n;s++){
if(pr[s][3]==b)
installt(searchnt(pr[s][0]),searchter(c));
}}
for(i=0;i<nt;i++){
printf("Trailing %ct{", NT[i]);
for(j=0;j<t;j++){
if(tr[i][j]=='t')
printf("%c ,", T[j]);
}
printf("}n");
}
getch();
}}}}

Mukesh Kumar
1110751908
CSE 7th
Sem
Program-07
Write a program for computation of first.
#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
char t[5],nt[10],p[5][5],first[5][5],temp;
int i,j,not,nont,k=0,f=0;
clrscr();
printf("Enter the no. of Non-terminals in the grammer:");
scanf("%d",&nont);
printf("nEnter the Non-terminals in the grammer:");
for(i=0;i<nont;i++)
{
scanf("n%c",&nt[i]);
}
printf("nEnter the no. of Terminals in the grammer: ( Enter e for absiline ) ");
scanf("%d",&not);
printf("Enter the Terminals in the grammer:");
for(i=0;i<not||t[i]=='$';i++)
{
scanf("n%c",&t[i]);
}
for(i=0;i<nont;i++)
{
p[i][0]=nt[i];
first[i][0]=nt[i];
}
printf("nEnter the productions :n");
for(i=0;i<nont;i++)
{
scanf("%c",&temp);
printf("nEnter the production for %c ( End the production with '$' sign ) :",p[i][0]);
for(j=0;p[i][j]!='$';)
{

Mukesh Kumar
1110751908
CSE 7th
Sem
j+=1;
scanf("%c",&p[i][j]);
}}
for(i=0;i<nont;i++)
{
printf("nThe production for %c -> ",p[i][0]);
for(j=1;p[i][j]!='$';j++)
{
printf("%c",p[i][j]);
}}
for(i=0;i<nont;i++)
{
f=0;
for(j=1;p[i][j]!='$';j++)
{
for(k=0;k<not;k++){
if(f==1)
break;
if(p[i][j]==t[k])
{
first[i][j]=t[k]; first[i][j+1]='$'; f=1;
break;
}
else if(p[i][j]==nt[k])
{
first[i][j]=first[k][j];
if(first[i][j]=='e')
continue; first[i][j+1]='$'; f=1;
break;
}}}}
for(i=0;i<nont;i++)
{
printf("nnThe first of %c -> ",first[i][0]);
for(j=1;first[i][j]!='$';j++)
{
printf("%ct",first[i][j]);
}}
getch();
}

Mukesh Kumar
1110751908
CSE 7th
Sem
Program-08
Write a program to show the operations of stack.
#include<stdio.h>
#include<conio.h>
#define MAXSIZE 10
void push();
int pop();
void traverse();
int stack[MAXSIZE];
int Top=-1;
void main()
{
int choice;
char ch;
do
{
clrscr();
printf("nENTER 1 FOR PUSH: ");
printf("nENTER 2 TO POP THE ELEMENT: ");
printf("nENTER 3 TO TRAVERSE THE ELEMENTS: ");
printf("n ENTER YOUR CHOICE: ");
scanf("%d",&choice);
switch(choice)
{
case 1:push();
break;
case 2:printf("nTHE DELETED ELEMENT IS %d",pop());
break;
case 3: traverse();
break;
default:printf("n SORRY!!!!!YOU HAVE ENTERED A WRONG CHOICE");
}
printf("n DO YOU WISH TO CONTINUE???(Y/N): ");
fflush(stdin);
scanf("%c",&ch);
}
while(ch=='y'|| ch=='Y');
}

Mukesh Kumar
1110751908
CSE 7th
Sem
void push()
{
int item;
if(Top==MAXSIZE-1)
{
printf("n SORRY STACK IS FULL");
getch();
exit();
}
else
{
printf("ENTER THE ELEMENT TO BE INSERTED: ");
scanf("%d",&item);
Top=Top+1;
stack[Top]=item;
}
}
int pop()
{
int item;
if(Top==-1)
{
printf("SORRY!! STACK IS EMPTY");
getch();
exit();
}
else
{
item=stack[Top];
Top=Top-1;
}
return(item);
}
void traverse()
{
int i;
if(Top==-1)
{
printf("OHH!! STACK IS EMPTY");

Mukesh Kumar
1110751908
CSE 7th
Sem
getch();
exit();
}
else
{
for(i=Top;i>=0;i--)
{
printf("nTRAVERSED ELEMENT(S) IS/ARE:");
printf(" %d",stack[i]);
}
}
}

Mukesh Kumar
1110751908
CSE 7th
Sem
Program-09
Write a program to perform the operations on stack by using linked list.
#include<stdio.h>
#include<conio.h>
struct stack
{
int no;
struct stack *next;
}
*start=NULL;
typedef struct stack st;
void push();
int pop();
void display();
void main()
{
int choice, item;
char ch;
do
{
clrscr();
printf("nENTER 1 FOR PUSH ITEM: ");
printf("nENTER 2 TO POP THE ITEM FROM STACK: ");
printf("nENTER 3 TO DISPLAY THE ITEMS OF STACK: ");
printf("n ENTER YOUR CHOICE: ");
scanf("%d",&choice);
switch(choice)
{
case 1:push();
break;
case 2: item=pop();
printf("THE DELETED ITEM IS -->%d", item);
break;
case 3: display();
break;
default:printf("n SORRY!!!!!YOU HAVE ENTERED A WRONG CHOICE");
}
printf("n DO YOU WISH TO CONTINUE???(Y/N): ");

Mukesh Kumar
1110751908
CSE 7th
Sem
fflush(stdin);
scanf("%c",&ch);
}
while(ch=='y'|| ch=='Y');
}
void push()
{
st *node ;
node=(st *)malloc(sizeof(st));
printf("n ENTER THE NUMBER TO BE INSERTED");
scanf("%d",&node->no);
node->next =start;
start=node;
}
int pop()
{
st *temp;
temp=start;
if(start==NULL){
printf("STACK IS ALREADY EMPTY: ");
getch();
exit();
}
else
{
start=start->next;
free(temp);
}
return(temp->no);
}
void display(){
st *temp;
temp=start;
while(temp->next!=NULL){
printf("n no=%d", temp->no);
temp=temp->next;
}
printf("n no=%d",temp->no);
}

Mukesh Kumar
1110751908
CSE 7th
Sem
Program-10
Write a program to perform the operations on file.
#include<stdio.h>
#include<stdlib.h>
int main()
{
char ch,source_file[20],target_file[20];
FILE *source, *target;
printf("Enter the name of file to copyn ");
gets(source_file);
source=fopen(source_file,"r");
if(source==NULL)
{
printf("Press any key to exit..n ");
exit(EXIT_FAILURE);
}
printf("Enter the name of target filen");
gets(target_file);
target=fopen(target_file,"w");
if(target==NULL)
{
fclose(source);
printf("Press any key to exit..n");
exit(EXIT_FAILURE);
}
while((ch=fgetc(source))!=EOF)
fputc(ch,target);
printf("File copied successfullyn");
fclose(source);
fclose(target);
return 0;
}

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