Month: October 2014

Write a C++ program that overloads the + operator and relational operators (suitable) to perform the following operations:

1. Concatenation of two strings.

2. Comparison of two strings.

 

#include<iostream>
#include<string.h>
using namespace std;
class con
{
    char str1[50],str2[20];
public:
    void getdata()
    {
        cout<<"Enter the two strings"<<endl;
        cin>>str1;
        cin>>str2;
    }
    con operator +(con b)
    {
        strcat(b.str1,b.str2);
        return b;
    }
    void display()
    {
        cout<<str1<<endl;
    }
    con operator ==(con b)
    {
        if(strcmp(b.str1,b.str2)==0)
        {
            cout<<"Equal";
        }
     else
     {
         cout<<"Not Equal";
     }
    }
};
int main()
{
    con a,b,c;
    b.getdata();
    b=a+(b);
    b.display();
    b=a==(b);
}

 

Write a program that takes two input strings S1 and S2 and finds if S2 is a substring of S1 or not. If S2 is a substring of S1, the program should print the index at S1 at which there is a match. If S2 is not a substring of S1, the program should print -1. If S2 appears in S1 multiple times, print the first index in S1 at which the match occurred.

Code:

#include<iostream>
#include<string.h>
using namespace std;
int main()
{
    int a,i;
    int pos;
    char str1[50],str2[50];
    cout<<"Enter the two strings"<<endl;
   cin>>str1>>str2;
 if(strstr(str1,str2))
 {
     char *pt=strstr(str1,str2);
     pos= pt-str1;
     cout<<pos;
 }
 else
 cout<<"-1";
}