利用栈求表达式的值

看得分记录Р FILE *mp;Р mp=fopen("markrec.txt","rt");Р if(mp==NULL)Р{Р printf("不能打开markrec.txt\n");Р free(m);Р exit(0);Р }Р fread(m,sizeof(int),num,mp);Р fclose(mp);Р}Р//*************************************Рvoid (int *m,int num)Р{//把m的值记录到n_rec.txt中Р FILE *mp;Р mp=fopen("n_rec.txt","wt");Р if(mp==NULL)Р{Р printf("不能创建n_rec.txt\n");Р free(m);Р exit(0);Р }Р fwrite(m,sizeof(int),num,mp);Р fclose(mp);Р}//RecmarkРvoid LookN(int *m,int num)Р{//查看m的值Р FILE *mp;Р mp=fopen("n_rec.txt","rt");Р if(mp==NULL)Р{Р printf("不能打开n_rec.txt\n");Р free(m);Р exit(0);Р }Р fread(m,sizeof(int),num,mp);Р fclose(mp);Р}Р//*************************************Рint excersice_begin()Р{Р int i, j, temp, KEY[20]; Р int mark,count=0;Р int *Mark;Р char g;Р SqStack1 s1,*OPND;Р SqStack2 s2,*OPTR;Р xuanti *XT;Р OPND=&s1;Р OPTR=&s2;