String Pointers C program

This program finds string length, copy a string and compare two strings using Pointers and Functions. This is a part of Mumbai University MCA Colleges C Programs MCA Sem 1

#include<stdio.h>

#include<conio.h>

int xstrlen(char *);

void xstrcopy(char *, char *);

int xstrcomp(char *, char *);

void xstrconcat(char *);

void main()

{

char s1[20],s2[20];

int i,ch;

clrscr();

printf("\n 1.String Length \n 2.String Copy \n 3.String Compare \n 4. Concatenation of 2 Strings \n Enter your choice");

scanf("%d",&ch);

switch(ch)

{

case 1:

{

int l=0;

printf("\nEnter String");

scanf("%s",&s1);

l=xstrlen(s1);

printf("\n Length of %s is %d",s1,l);

break;

}

case 2:

{

printf("\n Enter 1st string");

scanf("%s",&s1);

printf("\n Enter 2nd string");

scanf("%s",&s2);

xstrcopy(s1,s2);

printf("\n First string: %s",s1);

break;

}

case 3:

{

int a;

printf("\n Enter 1st string");

scanf("%s",&s1);

printf("\n Enter 2nd string");

scanf("%s",&s2);

a=xstrcomp(s1,s2);

if(a==0)

printf("Strings are equal");

else

printf("Strings are not equal");

break;

}

case 4:

{

printf("\n Enter 1st string");

scanf("%s",&s1);

printf("\n Enter 2nd string");

scanf("%s",&s2);

xstrconcat(s1,s2);

printf(“String after concatenation: %s”, s1);

}

default:

{

break;

}

}

getch();

}

int xstrlen(char *s)

{

int l=0;

while(*s!='\0')

{

l++;

s++;

}

return(l);

}

void xstrcopy(char *s1, char *s2)

{

while(*s2!='\0')

{

*s1=*s2;

s1++;

s2++;

}

*s1='\0';

}

int xstrcomp(char *s1, char *s2)

{

while(*s1!='\0' && *s2!='\0')

{

if(*s1==*s2)

return(0);

s1++;

s2++;

}

return(*s1-*s2);

}

void xstrconcat(char *s1, char *s2)

{

int i=0, len=0;

while(*(s1+i)!=’\0’)

{

len++;

i++;

}

for(i=len;*s2==’\0’;++i)

{

*(s1+i)=*s2;

s2++;

}

*(s1+i)=’\0’;

}

Hope this Program is useful to you in some sense or other. Keep on following this blog for more Mumbai University MCA College Programs. Happy Programming and Studying.