String Search Algorithm in C++

This C++ program performs naive string matching without using any specific library functions. A text and a pattern is given as input. The pattern is searched for in the text and all instances of the pattern are given as output.

This C++ program is successfully compiled and tested on our system. The program output is given below.

```
/*
```

 * C++ Program to Implement the String Search Algorithm for

```
 * Short Text Sizes
```
```
 */
```
```
 
```
```
//enter string without spaces
```
```
#include<iostream>
```
```
using namespace std;
```
```
 
```
```
int main()
```
```
{
```
```
    char org[100], dup[100];
```
```
    int i, j, k = 0, len_org, len_dup;
```

    cout<<"NOTE:Strings are accepted only till blank space.";

```
    cout<<"\nEnter Original String:";
```
```
    fflush(stdin);
```
```
    cin>>org;
```
```
    fflush(stdin);
```
```
    cout<<"Enter Pattern to Search:";
```
```
    cin>>dup;
```
```
 
```
```
    len_org = strlen(org);
```
```
    len_dup = strlen(dup);
```

    for (i = 0; i <= (len_org - len_dup); i++)

```
    {
```
```
        for (j = 0; j < len_dup; j++)
```
```
        {
```

            //cout<<"comparing '"<<org[i + j]<<"' and '"<<dup[j]<<"'.";

```
            if (org[i + j] != dup[j])
```
```
                break ;
```
```
        }
```
```
        if (j == len_dup)
```
```
        {
```
```
            k++;
```

            cout<<"\nPattern Found at Position: "<<i;

```
        }
```
```
    }
```
```
    if (k == 0)
```

        cout<<"\nError:No Match Found!";

```
    else
```

        cout<<"\nTotal Instances Found = "<<k;

```
    return 0;
```
```
}
```

Output
 
NOTE:Strings are accepted only till blank space.
Enter Original String:allmenwenttoapall mall
Enter Pattern to Search:all
 
Pattern Found at Position: 0
Pattern Found at Position: 14
Total Instances Found = 2

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