四则运算--第三周

Posted 2020-08-11

/功能：由随机数决定出题为10个以内的数字，并确定是否出现括号（仅限一对），顺序输出表达式，并用栈的方式进行计算，判断正误。其他功能有待进一步实现。



//头文件

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <math.h>


//栈的结构体

typedef struct stack
{
    double * e;
    int zd;
}bds_stack;


//声明函数

void InitStack(bds_stack ** s,int n);
int Push_stack(bds_stack * s,double t);
void Pop_stack(bds_stack * s,double * t);
double Opt_num();
void Cal(int n);
void yxj_table();


//定义全局变量

int yxj[7][7];
bds_stack * dz,* tz;


//主函数


int main()
{
    int num;
    int c = 0,p,s;
    double r,ans,r1,r2,r3;
    int * d,* t;
    int p1,p2;       //存储出现括号的下标
int m,n,f;       //分别记录数组d、t的下标
int i,j,k;
    yxj_table();     //初始化优先级数组
    scanf("%d",&num);
    srand(time(NULL));       //随机数种子
    for(i = 0;i < num;i++)
    {
        m = 0;n = 0;f = 0;
        while(c == 1||c == 0)
        {
            c = rand()%10;  //数字字符
        }
        s = rand()%2;     //是否出现括号
        if(s == 1)         //确定字符总数
        {
            p = c + 1;
        }
        else
        {
            p = c - 1;
        }
        printf("%d %d %d\n",c,p,s);
        d = (int * )malloc(sizeof(int)*c);
        t = (int * )malloc(sizeof(int)*p);
        InitStack(&dz,c);
        InitStack(&tz,p);
        Push_stack(tz,0);       //0为‘#’
        for(j = 0;j < c;j++)
        {
            d[j] = rand()%100;             //数字为两位数
        }
        if(s == 1)
        {
            p1 = rand()%(p-2)+1;
            p2 = rand()%(p-p1-1)+1+p1+1;
            p1--; p2--;                    //下标
            t[p1] = 5;
            t[p2] = 6;
        }
        for(j = 0;j < p;j++)
        {
            if(s == 1)
            {
                if(j == p1||j == p2)
                    continue;
            }
            t[j] = rand()%4+1;
        }
        j = 0;
        if(t[n] == 5)
        {
            printf("(");
            Push_stack(tz,t[n]);
            n++;
            j++;
        }
        for(;j < (c+p);)              //输出表达式
        {
            if(f == 0)
            {
                printf("%d",d[m]);
                Push_stack(dz,d[m]);
                m++; j++;
                if(t[n] == 6)
                {
                    printf(")");
                    while(yxj[(int)tz->e[tz->zd-1]][t[n]] != 2)
                    {
                        if(yxj[(int)tz->e[tz->zd-1]][t[n]] == 1)
                        {
                            r = Opt_num();
                            Push_stack(dz,r);
                        }
                        else
                        {
                            printf("出错!\n");
                            return 1;
                        }
                    }
                    Pop_stack(tz,&r);
                    n++; j++;
                }
                f = 1;
            }
            else
            {
                if(t[n] == 1)
                {
                    printf("+");
                    Cal(t[n]);
                }
                if(t[n] == 2)
                {
                    printf("-");
                    Cal(t[n]);
                }
                if(t[n] == 3)
                {
                    printf("*");
                    Cal(t[n]);
                }
                if(t[n] == 4)
                {
                    printf("/");
                    Cal(t[n]);
                }
                n++;j++;
                if(t[n] == 5)
                {
                    printf("(");
                    Push_stack(tz,t[n]);
                    n++; j++;
                }
                f = 0;
            }
        }
        printf(" =  ?\n");
        while((yxj[(int)(tz->e[tz->zd-1])][0]) != 2)
        {
            r = Opt_num();
            Push_stack(dz,r);
        }
        scanf("%lf",&ans);
        if(ceil(fabs(r-ans)) == 0)
        {
            printf("right!!\n");
        }
        else
        {
            printf("false!!\n");
        }
    }
    return 0;
}



//初始化优先级表


void yxj_table()
{
    int i,j;
    yxj[0][0] = 2;
    yxj[0][6] = 3;  yxj[5][0] = 3;
    for(i = 0,j = 1;j <= 5;j++)
    {
        yxj[i][j] = 0;
    }
    yxj[6][0] = 1;
    for(i = 1;i <= 4 ;i++)
    {
        for(j = 0;j <= 2;j++)
        {
            yxj[i][j] = 1;
        }
    }
    for(i = 5,j = 1;j <= 4;j++)
        yxj[i][j] = 0;
    for(i = 6,j = 1;j <= 4;j++)
        yxj[i][j] = 1;
    for(i = 1;i <= 2;i++)
    {
        for(j = 3;j <= 5;j++)
        {
            yxj[i][j] = 0;
        }
    }
    for(i = 3;i <= 4;i++)
    {
        for(j = 3;j <= 4;j++)
        {
            yxj[i][j] = 1;
        }
    }
    yxj[3][5] = 0; yxj[4][5] = 0;
    for(j = 6,i = 1;i <= 4;i++)
    {
        yxj[i][j] = 1;
    }
    yxj[5][6] = 2;
    yxj[5][5] = 3;  yxj[6][5] = 3; yxj[6][6] = 3;
}



//初始化栈

void InitStack(bds_stack ** s,int n)
{
    *s = (bds_stack*)malloc(sizeof(bds_stack));
    (*s)->e = (double*)malloc(sizeof(double)*n);
    (*s)->zd = 0;
}


//入栈


int Push_stack(bds_stack * s,double t)
{
    int q;
    s->e[s->zd] = t;
    q = s->zd;
    s->zd++;
    return q;
}



//出栈

void Pop_stack(bds_stack * s,double * t)
{
    (*t) = s->e[--(s->zd)];
}


//字符出栈计算


double Opt_num()
{
    double num1,num2,opt;
    Pop_stack(dz,&num2);
    Pop_stack(tz,&opt);
    Pop_stack(dz,&num1);
    if(opt == 1)
    {
        return num1 + num2;
    }
    if(opt == 2)
    {
        return num1 - num2;
    }
    if(opt == 3)
    {
        return num1 * num2;
    }
    if(opt == 4)
    {
        return num1 / num2;
    }
    return 0;
}



//优先级比较


void Cal(int n)
{
    double r;
    int k;
    while(yxj[(int)(tz->e[tz->zd-1])][n] != 0)
    {
        if(yxj[(int)(tz->e[tz->zd-1])][n] == 1)
        {
            r = Opt_num();
            Push_stack(dz,r);
        }
        else
        {
            printf("出错!\n");
        }
    }
    Push_stack(tz,(double)n);
}