substr_count.cpp

#include <iostream>
#include <string.h>

using namespace std;

int main()
{
    char  in[101];
    char  sub[31];
    cout<<"Введи строку: ";
    cin.getline(in, 101);
    
    cout<<"Введи слово: ";
    cin>> sub;
    
    int   count   = 0;
    int len  = strlen(sub);
    for(char *p  = in; (p = strstr(p, sub)); p+=len){
        ++count;
    }
    cout << count << "\n";
}