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阅读程序写结果：
#include <iostream>
#include <string>
using namespace std;
void fun( char *a, char *b ) {
a = b;
(*a)++;
}
int main() {
char c1, c2, *p1, *p2;
c1 = 'A';
c2 = 'a';
p1 = &c1;
p2 = &c2;
fun( p1, p2 );
cout << c1 << c2 << endl;
return(0);
}输出：__________
