C++ program to perform all operations on strings. Count the length of two strings, concatenate two strings, compare two strings.

C++ program to perform all operations on strings. Count the length of two strings, concatenate two strings, compare two strings.

#include"iostream.h"
#include"conio.h"
#include"stdio.h"
void findlength()
{
 char str[30];
 int l=0;
 cout<<"\n Enter the string (size < =30) ";
 gets(str);
 while(str[l]!='\0')
 {
  l++;
 }
 cout<<"\n Length Of the given String is: "<< l<< endl;
}
void compare()
{
 char str1[30], str2[30];
 int l1=0,l2=0,i=0,flag=0;
 cout<<"\n Enter the string1 (size< =30) ";
 gets(str1);
 while(str1[l1]!='\0')
 {
  l1++;
 }
 cout<<"\n Enter the string2 (size< =30) ";
 gets(str2);
 while(str2[l2]!='\0')
 {
  l2++;
 }
 if(l2!=l1)
 {
  cout<<"\n Strings are not Equal ";
 }
 else
 {
  for(i=0;i< l1; i++ )
  {
      if(str1[i]!=str2[i])
      {
   flag=1;
   break;
      }
  }
  if(flag==1)
  {


   cout<< "\n Strings are not Equal ";
  }
  else
  {
   cout<< "\n Strings are Equal ";
  }
 }




}


void concat()
{
 char str1[30], str2[30];
 int l1=0,l2=0,i=0,flag=0;
 cout<<"\n Enter the string1 (size< =30 ) ";
 gets(str1);
 while(str1[l1]!='\0')
 {
  l1++;
 }
 cout<<"\n Enter the string2 (size< =30 ) ";
 gets(str2);
 while(str2[l2]!='\0')
 {
  l2++;
 }
 for(i=0;i < l2;i++)
 {
  str1[l1+i]=str2[i];
 }
 str1[l1+l2]='\0';
 cout<<"\n The concatenated String is: ";
 puts(str1);


}




void main()
{
 clrscr();
 cout<<" Enter your choice \n \t1.Find length of string\n\t"
 "2.Compare two Strings \n\t3.Concatenate two strings\n\t4.Exit \n";
 char ch;
 cin>> ch;
 do
 {
  if(ch=='1')
   findlength();
  if(ch=='2')
   compare();
  if(ch=='3')
   concat();
  cout<< "Enter your choice \n \t1.Find length of string\n\t"
 "2.Compare two Strings \n\t3.Concatenate two strings\n\t4.Exit \n";
 cin>> ch;


 }while(ch!='4');
 getch();
}

Step by Step explanation:
1.Header file "iostream.h" is used for including the function like cin and cout.
2.Header file "stdio.h" , "conio.h" for including the function like printf and scanf.
3."Findlenth" is a function of void type and it is used to calculate the lenth of string.
4.compare is a function of void type and it is used to compare the two string.
5.while is a loop it is used to apply the condition.
6.if is also a loop and it is too used for apply the condition.
7.else is a condition check statement it is used in case of failing the if statement.
8.Break is a keyword and it is used to break the loop.
9.concat is a function of void type and it is used to join the two string:string becomes in the form of matrix.
10.Main is also a function of void type and it works during the curley brackets.