How do I use string::find in C++17?
In C++17, you can use the string::find
method to locate a substring within a string. It returns the index of the first occurrence.
Can you show me a code example?
Sure! Here's a simple example:
#include <iostream>
#include <string>
int main() {
std::string str = "Hello, World!";
size_t found = str.find("World");
if (found != std::string::npos) {
std::cout << "Found at: " << found << std::endl;
}
return 0;
}
What does std::string::npos
mean?
std::string::npos
is a constant representing the largest possible value for an element of type size_t
. It's used to indicate that a substring was not found.
Are there any other methods to search in strings?
Yes, besides find
, you can use rfind
for reverse searching, find_first_of
for finding any character from a set, and find_last_of
for the last occurrence.
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