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  1. #include <iostream>
  2. using namespace std ;
  3.  
  4. char *strstr(char *str1, const char *str2)
  5. {
  6. 	int count2= 0, count2_max= 0 ;
  7.  
  8. 	while (*(str2) != '\0') //recording max value of 2nd string
  9. 	{
  10. 		str2++ ;
  11. 		count2_max++ ;
  12. 	}
  13. 	str2 -= count2_max ;
  14. 	while (*(str1) != '\0') //checking string 1 character by character for if it has string 2 in it.
  15. 	{
  16. 		if (*(str2) == *(str1))
  17. 		{
  18. 			str2++ ;
  19. 			count2++ ;
  20. 		}
  21. 		else
  22. 		{
  23. 			if (*(str1) != *(str1-1))
  24. 			{
  25. 				count2= 0 ;
  26. 			}
  27. 		}
  28.  
  29. 		if (count2 == count2_max) //checking if 2nd string is complete in the first string
  30. 		{
  31. 			str1=((str1-count2_max) + 1) ;
  32. 			return 	str1 ;
  33. 		}
  34. 		str1++ ;
  35. 	}
  36. 	if (*(str1) == '\0')
  37. 	{
  38. 		return NULL ;
  39. 	}
  40. }
  41.  
  42. int main()
  43. {
  44. 	char *str1= new char[100] ; //The first string
  45. 	char *str2= new char[100] ; //The second string
  46.  
  47. 	cout << "Please Enter the string: " ; cin.getline(str1, 100) ;
  48. 	cout << "Now please enter the second string: " ; cin.getline(str2, 100) ;
  49.  
  50. 	cout << endl << "The pointer to the first occured second string (str2) in the first string (str1) holds the following address: " << (int*)strstr(str1, str2) << endl << endl ;
  51.  
  52. 	delete []str1 ;
  53. 	delete []str2 ;
  54. }
  55.  
Success #stdin #stdout 0s 3476KB
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stdout
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Please Enter the string: Now please enter the second string: 
The pointer to the first occured second string (str2) in the first string (str1) holds the following address: 0x8a1000a
https://ideone.com/crbnQy
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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