c++小程序之加减法练习

闲来无事，用c++写了个加减法练习的小程序，代码如下：

#include
#include
#include 
#include
#include
using namespace std;
int score=0,counter=0,righter=0; 
const int rangeRandom(int nummin,int nummax=32767) 
{
    srand((int)time(NULL));
    if (nummin>nummax){
        swap(nummin,nummax);
    }
    int another_num=nummax-nummin;
    if (another_num<=0){ 
        return 0;
    }
    else if (another_num<32767){
        return nummin+(rand()%another_num);
    }
    else{
        return nummin+int(((rand()%32767)/32767)*another_num);
    }
}
const int plusused(int m,int n,int p,int q){
	int righter=0;
	cout<<"接下来我们开始做"<d;
	    c=a+b;
	    if(c==d){ 
		    cout<<"答对啦"<=0.8*p){
		if(q<=3){	
		plusused(m+=10,n+=15,10,++q);
		}
	}
	else{
		cout<<"LOW  CORRECT  RATE"<d;
	    c=a-b;
	    if(c==d){ 
		    cout<<"答对啦"<=0.8*z){
		if(u<=3){	
		minusused(x+=10,y+=15,10,++u);
		}
	}
	else{
		cout<<"LOW  CORRECT  RATE"<0){
			    cout<0){
				cout<>e;
		if(e==d){
			cout<<"答对啦"<=0.8*mc){
		if(md<=3){	
		minusused(ma+=10,mb+=15,10,++md);
		}
	}
	else{
		cout<<"LOW  CORRECT  RATE"< 
本人c++小白，程序写的可能不大好，求各位大神指教~