'a'was found in "This is a test".
'z'was not found in "This is a test".
利用函数计算字符串1中出现字符串2的次数
#include <iostream>
using std::cout;
using std::endl;
int main()
{
char *string1="asdfasdfasdf";
const char *string2="df";
int i=0;
while (strstr(string1,string2)!=NULL)
{
++i;
string1=strstr(string1,string2);
string1+=strlen(string2);
}
cout<<i<<endl;
return 0;
}