strspn() prototype
size_t strspn( const char* dest, const char* src );
It is defined in <cstring> header file.
strspn() Parameters
dest: Pointer to the null terminated byte string to be searched for.src: Pointer to the null terminated byte string that contains the characters to search for.
strspn() Return value
The strspn() function returns the length of the maximum initial segment of dest that contains only characters from byte string pointed to by src.
Example: How strspn() function works
#include <cstring>
#include <iostream>
using namespace std;
int main()
{
char src[] = "0123456789";
char dest[] = "190126abqs121kfew";
size_t length = strspn(dest, src);
cout << dest << " contains " << length << " initial numbers";
return 0;
}
When you run the program, the output will be:
190126abqs121kfew contains 6 initial numbers
