Write a program in c to carry out operation on string using library functions

/*-------------------------------------------------------------------------------------------------

 program   : Write a program in c to carry out following operation on

                      strings using library functions

                        a. To concatenate a string s2 to string s1.

                        b. To find the lengh of given string.

                        c. To compare two string s1 and s2.

                        d. To copy a string s2 to another string s2.

 Crated By : JABIR DAUD PATHAN

 Branch    : COMPUTER ENGINEERING

------------------------------------------------------------------------------------------------*/

//----------------------  Header Files  --------------------------------

#include<stdio.h>

#include<conio.h>

#include<string.h>

//---------------------  Main Function  --------------------------------

void main()

 {

  char str1[20],str2[20],str3[20];  //Variable declaration

  int ch;

  clrscr();  //Clear the text mode of window

  printf("\n\t --------MENU-----------");

  printf("\n\t1.Concatenation of Two Strings");

  printf("\n\t2.Find out the String Length");

  printf("\n\t3.Comparison of Two Strings");

  printf("\n\t4.Copy One String Into Another String");

  printf("\n\t5.Exit");

  printf("\n\t  Enter Your Choice==>");

  scanf("%d",&ch);   //accept choice from user

  switch(ch)

   {

     case 1:

                 printf("Enter Any two string\n");  //Display the msg

                 scanf("%s%s",&str1,&str2);//To accept str1 and str2 from user

                 printf("\n\n Before Concatenate Two Strings Are str1=%s And str2=%s",str1,str2);

                 strcat(str1,str2);   //use of string concatenation function

                 printf("\n\n After concatenation string str1=%s And str2=%s",str1,str2);

                 break;

     case 2:

                 printf("Enter Any two string\n");

                 scanf("%s%s",&str1,&str2);

                 printf("\n Length of Strings Are==>\n");

                 printf("\n Length of String %s is =%d",str1,strlen(str1));  //use of string length function

                 printf("\n Length of String %s is =%d",str2,strlen(str2));

                 break;

     case 3:

                 printf("Enter Any two string\n");

                 scanf("%s%s",&str1,&str2);

                 printf("\n\n Comparison of Two Strings==>");

                 if(strcmp(str1,str2)==0) //compare strings by using string copy function

                  {

                         printf("%s and %s are equal string", str1,str2);

                  }

                 else

                  {

                         printf("\n\n%s and %s are not equal string",str1,str2);

                  }

                 break;

     case 4:

                 printf("Enter Any two string\n");

                 scanf("%s%s",&str1,&str2);

                 printf("\n\n\n Copy One String into Strings==>");

                 printf("\n\n Befor copping string str2 to str1 str1=%s,str2=%s",str1,str2);

                 strcpy(str1,str2);   //string copy function

                 printf("\n\n After coppying string str2 into str1 string str1=%s and string str2=%s",str1,str2);

                 break;

     case 5:

                 exit(0);

                 break;

    default:

                 printf("\n\t Invalid Choice");

                 break;

  }

  getch();  //To get quick output window

 }

//-------------------  End of Mian Function  ----------------------------

/*-----------------<< OUTPUT SCREEN  >>-------------------*/

         --------MENU-----------

        1.Concatenation of Two Strings

        2.Find out the String Length

        3.Comparison of Two Strings

        4.Copy One String Into Another String

        5.Exit

          Enter Your Choice==>1

Enter Any two string

jai

hind

 Before Concatenate Two Strings Are str1=jai And str2=hind

 After concatenation string str1=jaihind And str2=hind

         --------MENU-----------

        1.Concatenation of Two Strings

        2.Find out the String Length

        3.Comparison of Two Strings

        4.Copy One String Into Another String

        5.Exit

          Enter Your Choice==>2

Enter Any two string

jay

maharashtra

 Length of Strings Are==>

 Length of String jay is =3

 Length of String maharashtra is =11

         --------MENU-----------

        1.Concatenation of Two Strings

        2.Find out the String Length

        3.Comparison of Two Strings

        4.Copy One String Into Another String

        5.Exit

          Enter Your Choice==>3

Enter Any two string

jay

jay

 Comparison of Two Strings==>jay and jay are equal string

         --------MENU-----------

        1.Concatenation of Two Strings

        2.Find out the String Length

        3.Comparison of Two Strings

        4.Copy One String Into Another String

        5.Exit

          Enter Your Choice==>3

Enter Any two string

jay

jai

 Comparison of Two Strings==>jay and jai are not equal string

         --------MENU-----------

        1.Concatenation of Two Strings

        2.Find out the String Length

        3.Comparison of Two Strings

        4.Copy One String Into Another String

        5.Exit

          Enter Your Choice==>4

Enter Any two string

jai

hind

 Copy One String into Strings==>

 Befor copping string str2 to str1 str1=jai,str2=hind

 After coppying string str2 into str1 string str1=hind and string str2=hind

         --------MENU-----------

        1.Concatenation of Two Strings

        2.Find out the String Length

        3.Comparison of Two Strings

        4.Copy One String Into Another String

        5.Exit

          Enter Your Choice==>5

         --------MENU-----------

        1.Concatenation of Two Strings

        2.Find out the String Length

        3.Comparison of Two Strings

        4.Copy One String Into Another String

        5.Exit

          Enter Your Choice==>11

         Invalid Choice