String Operations in C Program
Problem Statement
Source Code to Implement String Operations in C Program or String Operation in C and C++ Language . Operations on String are as Follows :
- Input Operations – This operation will ask for input from user.
- Display Operations – This will display user the output.
- Palindrome Operations – this function will check the entered string for palindrome.
- Copy String – This option will make a copy of string.
- Compare Operations on String – This option will compare the two entered strings according to requirement.
- Reverse Strings – This function will reverse the string and then print to the screen.
- Concatenate Operations on String – This function will concatenate two strings and then print the final string.
- Finding Sub string Operations on String
Operations implementation by two methods
- Using Pointers
- Without Pointers
String Operations in C Program Code
#include
#include
void withp(char []);
void withoutp(char []);
void in (char []);
void out(char []);
void palindrome(char []);
void reverse(char []);
void substring(char []);
void compare(char []);
void concat (char []);
int length (char []);
void copy(char []);
void input(char *);
void display(char *);
void palindrome1(char *);
void reverse1(char *);
void compare1(char *);
void concat1 (char *);
void substring1 (char *);
int length1 (char *);
void copy1(char *);
void main()
{
int ch;
char str[50];
str[0]=NULL;
clrscr();
do
{
clrscr();
printf("\n\n\n\t\t-------: MAIN MENU :--------");
printf("\n\n\n\t1\tUSING POINTERS \n ");
printf("\n\t2\tWITHOUT USING POINTERS\n");
printf("\n\t3\tEXIT\n\n");
printf("\n\tENTER UR CHOICE\t: ");
scanf("%d",&ch);
switch(ch)
{
case 1: withp(str);
break;
case 2:withoutp(str);
break;
case 3: break;
default:
printf("\n\n\t!!!!!! INVALID CHOICE !!!!!!!");
getch();
}
}while(ch!=3);
getch();
} //END OF MAIN
/*********************************************************************
WITH POINTERS FUNCTOIN
************************************************************************/
void withp(char str[])
{
int ch,s1=0;
do
{
clrscr();
printf("\n\n\t\t------: USING POINTER MENU :------\n\n");
printf("\n\n\t1\tINPUT");
printf("\n\n\t2\tDISPLAY");
printf("\n\n\t3\tLENGHT OF THE STRING");
printf("\n\n\t4\tPALINDROME");
printf("\n\n\t5\tCOPY THE STRING");
printf("\n\n\t6\tCOMPARE THE STRING ");
printf("\n\n\t7\tREVERSE");
printf("\n\n\t8\tCONCATINATE THE STRING");
printf("\n\n\t9\tFIND THE SUBSTRING");
printf("\n\n\t10\tRETURN TO MAIN MENU");
printf("\n\n\n\tENTER UR CHOICE \t: ");
scanf("%d",&ch);
switch(ch)
{
case 1:
input(str);
break;
case 2:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
display(str);
getch();
break;
case 3:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
s1=length1(str);
printf("\n\n\tLENGTH OF THE STRING IS %d",s1);
getch();
break;
case 4:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
palindrome1(str);
break;
case 5:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
copy(str);
break;
case 6:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
compare1(str);
break;
case 7:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
reverse1(str);
break;
case 8:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
concat1(str);
break;
case 9:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
substring1(str);
break;
case 10:
break;
default:
printf("\n\n\t!!!! INVALID CHOICE !!!!!");
getch();
}
}while(ch!=10);
}
/*****************************************************************
INPUT FUNCTION
*******************************************************************/
void input(char *str)
{
int i=0;
printf("\n\n\tENTER THE STRING\t");
do
{
flushall();
*(str+i++)=getche();
} while(*(str+i-1)!='\r');
*(str+i)=NULL;
}
/*****************************************************************
DISPLAY FUNCTION
*******************************************************************/
void display(char *str)
{
int i=0;
printf("\n\n\t\t");
while(*(str+i)!='\r')
{
printf("%c",*(str+i++));
}
getch();
}
/*****************************************************************
PALINDROME FUNCTION
*******************************************************************/
void palindrome1(char *str)
{
int s,e,l=0;
l=length1(str);
for(s=0,e=l-1;s<e;s++,e--) <br=""> if(*(str+s)!=*(str+e))
break;
if(s==e)
printf("\n\n\t!!!!!!!! PALINDROME !!!!!!!!");
else
printf("\n\n\t!!!!!!!! NOT PALINDROME !!!!!!!!");
getch();
}
/*****************************************************************
REVERSE FUNCTION
*******************************************************************/
void reverse1(char *str)
{
int a,s,e,l=0;
l=length1(str);
for(s=0,e=l-1;s<e;s++,e--) <br=""> {
a=*(str+s);
*(str+s)=*(str+e);
*(str+e)=a;
}
printf("\n\n\t!!!!!!!!!! STRING HAS BEEN REVERSED !!!!!!!!!");
printf("\n\n\tREVERSED STRING :-->> ");
display(str);
}
/*****************************************************************
CONCATINATION FUNCTION
*******************************************************************/
void concat1 (char *str)
{
int i=0,l1;
char *s1;
input(s1);
l1=length1(str);
while(*(s1+i)!='\r')
*(str+i+l1)=*(s1+i++);
*(str+i+l1)='\r';
*(str+i+l1+1)=NULL;
printf("\n\n\tCONCATINATED STRING :-->> ");
display(str);
}
/*****************************************************************
LENGTH FUNCTION
*******************************************************************/
int length1(char *str)
{
int i;
for(i=0;*(str+i)!=NULL;i++);
return --i;
}
/*****************************************************************
COMPARE FUNCTION
*******************************************************************/
void compare1(char *st)
{
int i,j,l1=0,l2=0;
char *s1;
input(s1);
l1=length1(st);
l2=length1(s1);
if(l1==l2)
{
for(i=0;i<l1;i++) <br=""> if(*(st+i)!=*(s1+i))
{
if(*(st+i) > *(s1+i))
printf("\n\n\tFIRST STRING IS GREATER THAN THE SECOND ");
else
printf("\n\n\tSECOND STRING IS GREATER THAN THE FIRST ");
break;
}
if(i==l2)
printf("\n\n\tBOTH THE STRINGS R EQUAL");
}
else
{ if(l1>l2)
printf("\n\n\tFIRST STRING IS GREATER THAN THE SECOND ");
else
printf("\n\n\tSECOND STRING IS GREATER THAN THE FIRST ");
}
getch();
}
/*****************************************************************
COPY FUNCTION
*******************************************************************/
void copy1(char *st)
{
int i,j;
char *s1;
input(s1);
for(i=0;*(st+i)!=NULL;i++)
*(s1+i) = *(st+i);
*(s1+i)=NULL;
printf("\tTHE STRING IS COPIED");
display(s1);
getch();
}
/*****************************************************************
SUBSTRING FUNCTION
*******************************************************************/
void substring1(char *st)
{ int j,i,m=0,l2=0;
char *s1;
input(s1);
l2=length1(s1);
for(i=0;*(st+i)!=NULL;i++)
if(*(st+i)==*(s1))
{
for(j=1;j<l2;j++) <br=""> if(*(st+i+j)!=*(s1+j))
break;
if(j==l2)
m++;
}
if(m>0)
printf("\n\n\t\tTHE STRING YOU HAVE ENTERED IS PRESENT %d TIMES",m);
else
printf("\nTHE STRING YOU HAVE ENTERED IS NOT A SUBSTRING OF THE STRING\n");
getch();
}
/*******************************************************
WITHOUT POINTERS
********************************************************/
void withoutp(char str[])
{
int ch,s1=0;
clrscr();
do
{
clrscr();
printf("\n\n\t\t------: WITHOUT USING POINTER MENU :------\n\n");
printf("\n\n\t1\tINPUT");
printf("\n\n\t2\tDISPLAY");
printf("\n\n\t3\tLENGHT OF THE STRING");
printf("\n\n\t4\tPALINDROME");
printf("\n\n\t5\tCOPY THE STRING");
printf("\n\n\t6\tCOMPARE THE STRING ");
printf("\n\n\t7\tREVERSE");
printf("\n\n\t8\tCONCATINATE THE STRING");
printf("\n\n\t9\tFIND THE SUBSTRING");
printf("\n\n\t10\tRETURN TO MAIN MENU");
printf("\n\n\n\tENTER UR CHOICE \t: ");
scanf("%d",&ch);
switch(ch)
{
case 1:
in(str);
break;
case 2:
if(str[0]==NULL)
{
printf("\n\n\t!!!!! ENTER THE STRING ");
getch();
break;
}
printf("\n\n\tTHE STRING IS \n\n\t\t ");
out(str);
break;
case 3:
if(str[0]==NULL)
{
printf("\n\n\t!!!!!!! ENTER THE STRING ");
getch();
break;
}
s1=length(str);
printf("\n\n\tLENGTH OF THE STRING IS %d",s1);
getch();
break;
case 4:
if(str[0]==NULL)
{
printf("\n\n\t!!!!!!!!! ENTER THE STRING ");
getch();
break;
}
palindrome(str);
break;
case 5:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
copy(str);
break;
case 6:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
compare(str);
break;
case 7:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
reverse(str);
break;
case 8:
if(s1==0)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
concat(str);
break;
case 9:
if(str[0]==NULL)
{
printf("\n\n\tENTER THE STRING ");
getch();
break;
}
substring(str);
break;
case 10:
break;
default:
printf("\n\n\t!!!! INVALID CHOICE !!!!!");
getch();
}
}while(ch!=10);
}
/*****************************************************************
INPUT FUNCTION
*******************************************************************/
void in(char st[])
{
int i=0;
printf("\n\n\tENTER THE STRING\t");
do
{
flushall();
st[i++]=getche();
} while(st[i-1]!='\r');
st[i]=NULL;
}
/*****************************************************************
OUTPUT FUNCTION
*******************************************************************/
void out(char st[])
{
int i=0;
printf("\n\n\t\t");
while(st[i]!=NULL)
{
printf("%c",st[i++]);
}
getch();
}
/*****************************************************************
PALINDROME FUNCTION
*******************************************************************/
void palindrome (char st[])
{
int s,e,l=0;
l=length(st);
for(s=0,e=l-1;s<e;s++,e--) <br=""> if(st[s]!=st[e])
break;
if(s==e)
printf("\n\n\t!!!!!!!! PALINDROME !!!!!!!!");
else
printf("\n\n\t!!!!!!!! NOT PALINDROME !!!!!!!!");
getch();
}
/*****************************************************************
REVERSE FUNCTION
*******************************************************************/
void reverse (char st[])
{
int a,s,e,l=0;
l=length(st);
for(s=0,e=l-1;s<e;s++,e--) <br=""> {
a=st[s];
st[s]=st[e];
st[e]=a;
}
printf("\n\n\t!!!!!!!!!! STRING HAS BEEN REVERSED !!!!!!!!!");
printf("\n\n\tREVERSED STRING :-->> ");
out(st);
}
/*****************************************************************
COPY FUNCTION
*******************************************************************/
void copy(char st[])
{
int i,j,l=0;
char s1[50];
l=length(st);
for(i=0;i<l;i++) <br=""> s1[i]=st[i];
s1[i]=NULL;
printf("\tTHE STRING IS COPIED");
out(s1);
getch();
}
/*****************************************************************
COMPARE FUNCTION
*******************************************************************/
void compare(char st[])
{
int i,j,l1=0,l2=0;
char s1[50];
in(s1);
l1=length(st);
l2=length(s1);
if(l1==l2)
{
for(i=0;i<l2;i++) <br=""> if(st[i]!=s1[i])
{
if(st[i]>s1[i])
printf("\n\n\tFIRST STRING IS GREATER THAN THE SECOND ");
else
printf("\n\n\tSECOND STRING IS GREATER THAN THE FIRST ");
break;
}
if(i==l2)
printf("\n\n\tBOTH THE STRINGS R EQUAL");
}
else
{ if(l1>l2)
printf("\n\n\tFIRST STRING IS GREATER THAN THE SECOND ");
else
printf("\n\n\tSECOND STRING IS GREATER THAN THE FIRST ");
}
getch();
}
/*****************************************************************
SUBSTRING FUNCTION
*******************************************************************/
void substring (char st[])
{
int i,j,m=0,l1=0,l2=0;
char s1[50];
in(s1);
l1=length(st);
l2=length(s1);
for(i=0;i<l1;i++) <br=""> {
if(st[i]==s1[0])
{
for(j=0;j<l2;j++) <br=""> if(st[i+j]!=s1[j])
break;
if(j==l2)
m++;
}
}
if(m!=0)
printf("\n\n\t SUBSTRING IS PRESENT %d TIMES IN THE STRING",m);
else
printf("\n\n\tTHE SUBSTRING IS NOT PRESENT");
getch();
}
/*****************************************************************
CONCATINATION FUNCTION
*******************************************************************/
void concat (char st[])
{
int i=0,l1=0;
char s1[50];
l1=length(st);
while(s1[i]!='\r')
st[i+l1]=s1[i++];
st[i+l1]=NULL;
printf("\n\n\tCONCATINATED STRING :-->> ");
out(st);
}
/*****************************************************************
LENGTH FUNCTION
*******************************************************************/
int length (char st[])
{
int i;
for(i=0;st[i]!=NULL;i++);
return --i;
}
/*****************************************************************
THANKS
*******************************************************************/
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