How Does C++ Handle Substring Searches?

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SUMMARY

The discussion focuses on implementing a substring search function in C++. The user seeks guidance on creating a program that prompts for a string and a substring, then utilizes a custom function, int mystrstr(char *str, char *substr), to find the starting position of the substring within the string. If the substring is not found, the function should return -1. The output should display the substring and the remainder of the string starting from the found position.

PREREQUISITES
  • Understanding of C++ programming language syntax
  • Familiarity with pointers and character arrays in C++
  • Knowledge of function creation and return types in C++
  • Basic string manipulation techniques in C++
NEXT STEPS
  • Implement the mystrstr function to search for substrings in C++
  • Explore C++ string class methods for substring operations
  • Study pointer arithmetic in C++ for efficient string handling
  • Review error handling techniques for user input in C++ programs
USEFUL FOR

Students studying C++, software developers looking to enhance their string manipulation skills, and anyone preparing for programming tests involving substring searches.

crimsondancer
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I was reading my textbook to study for a test in my C++ class and I cam across this question and the answer is not in the book. I'm afraid I might need to know how to do something like this for my test and there isn't an example of one like it in my book. I'm not sure how to do it so I don't have any code to show you guys. I was wondering if anyone knew the answer to this question. Thanks!

Here it is:

Substring function

Write a program that finds a substring inside a string. Main program asks users to type a string and then a substring. Then, program calls a subfunction int mystrstr(char *str, char *substr). Inside the mystrstr subroutine, program searches substring substr in the string str and returns the starting position of the substring in the string. If the substring is not located in the string, then subroutine return -1. After searching the position, main program prints out the string from the position to the end of string of the string. e.g. string: "C++ program is really fun", substring: "program", Then, your program will print "program is really fun"
 
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