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#include <iostream>
#include <string>
#include <string.h>
using namespace std;
int main()
{
char foo1[20]; // 必须要知道char array的size
char foo2[] = {}; // size=0
char foo3[] = {'a', 'b', 'c', '\0'}; // size=4
char foo4[] = ""; // size=1
char foo5[] = "abc"; // size=4
char foo6[20] = "a";
cout<<"foo1: ("<<foo1<<") "<<strlen(foo1)<<" "<<sizeof(foo1)<<endl; // strlen(search for null only) returns a undefined reault here
cout<<"foo2: ("<<foo2<<") "<<strlen(foo2)<<" "<<sizeof(foo2)<<endl;
cout<<"foo3: ("<<foo3<<") "<<strlen(foo3)<<" "<<sizeof(foo3)<<endl;
cout<<"foo4: ("<<foo4<<") "<<strlen(foo4)<<" "<<sizeof(foo4)<<endl;
cout<<"foo5: ("<<foo5<<") "<<strlen(foo5)<<" "<<sizeof(foo5)<<endl;
cout<<"foo6: ("<<foo6<<") "<<strlen(foo6)<<" "<<sizeof(foo6)<<endl;
return 0;
}
