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How do I get a part of a string in C++? I want to know what are the elements from 0 to i.
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strncpy() Function to Get a Substring in C The strncpy() function is the same as strcpy() function. The only difference is that the strncpy() function copies the given number of characters from the source string to the destination string.
The substr() method extracts a part of a string. The substr() method begins at a specified position, and returns a specified number of characters. The substr() method does not change the original string.
strcpy can be used to copy one string to another. Remember that C strings are character arrays. You must pass character array, or pointer to character array to this function where string will be copied. The destination character array is the first parameter to strcpy .
In C, the strtok() function is used to split a string into a series of tokens based on a particular delimiter. A token is a substring extracted from the original string.
You want to use std::string::substr. Here's an example, shamelessly copied from http://www.cplusplus.com/reference/string/string/substr/
// string::substr
#include <iostream>
#include <string>
using namespace std;
int main ()
{
string str="We think in generalities, but we live in details.";
// quoting Alfred N. Whitehead
string str2, str3;
size_t pos;
str2 = str.substr (12,12); // "generalities"
pos = str.find("live"); // position of "live" in str
str3 = str.substr (pos); // get from "live" to the end
cout << str2 << ' ' << str3 << endl;
return 0;
}
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