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写出下列程序的执行结果是：__________________。#includeusing namespace std;int f1( int a, int b ) { return a + b ;}int f2( int a, int b ){ return a - b ;}int f3( int( t )( int, int ), int a, int b ) { return ( t )( a, b ) ;}void main(){ int ( *p )( int, int ); p = f1 ; cout << f3( p, 4, 8 ) <<","; p = f2 ; cout << f3( p, 8, 4 );}

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