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#include <stdio.h>
typedef float (__cdecl *TYPE_MYFUN)(float , float );
float FunAdd(float x, float y)
{
return x + y;
}
float FunSub(float x, float y)
{
return (x - y>0)?x-y:y-x;
}
float FunMul(float x, float y)
{
return x * y;
}
float FunDiv(float x, float y)
{
return x / y;
}
bool operatorFun( float a, float b ,float c ,float d);
int main(int argc, char* argv[])
{
//float Num[4] = { 3 , 3 , 8 , 8 };//答案为 8/(3-8/3) ;
float Num[4] = { 5 , 5 , 5 , 1 };//答案为5/(5-(1/5));
for( int a = 0 ; a < 4 ; a++ ){
for( int b = 0 ; b < 4 ;b++ ){
for( int c = 0 ; c < 4 ; c++ ){
for( int d = 0 ; d < 4 ; d++ ){
if((a==b)||(a==c)||(a==d)||(b==c)||(b==d)||(c==d))
continue;
if ( operatorFun(Num[a],Num[b],Num[c],Num[d]) )
return 0;
}
}
}
}
return 0;
}
bool operatorFun( float a, float b ,float c ,float d)
{
static TYPE_MYFUN Fun[4] = { FunAdd ,FunSub , FunMul , FunDiv };
static char op[4] = { '+' , '-' , '*' ,'/'};
for( int x = 0 ; x < 4 ; x++ ){
for( int y = 0 ; y < 4 ; y++ ){
for( int z = 0 ; z < 4 ; z++ ){
float sum = Fun[z]( Fun[y]( Fun[x](a,b) ,c) ,d);
if( (sum >23.9)&&(sum<24.1) ){
printf("((%d%c%d)%c%d)%c%d",(int)a,op[x] ,(int)b,op[y] ,(int)c,op[z],(int)d);
return true;
}
sum = Fun[z]( Fun[x](a,b) , Fun[y](c ,d) );
if( (sum >23.9)&&(sum<24.1) ){
printf("(%d%c%d)%c(%d%c%d)",(int)a,op[x] ,(int)b,op[z] ,(int)c,op[y],(int)d);
return true;
}
sum = Fun[z]( a , Fun[y](b , Fun[x](c,d) ) );
if( (sum >23.9)&&(sum<24.1) ){
printf("%d%c(%d%c(%d%c%d))",(int)a,op[z] ,(int)b,op[y] ,(int)c,op[x],(int)d);
return true;
}
}
}
}
return false;
}