String str, substr

Cout & lt& lt Please enter a string: ";

CIN & gt； & gtstr

Cout < < "Please enter the character field to be counted:";

CIN & gt； & gtsubstr

int num = 0；

string::size _ type pos = 0；

while((pos = str.find(substr，pos))！ = string::NPO)

{

num++；

++ pos；

}

Cout & lt& lt "The number of occurrences of the searched character segment is:"

Returns 0;

}//Enter a segment, and then enter a short segment to get the number of occurrences of the short segment.

That's it, I hope the landlord can understand ~