C++语言计算器源代码

1、C+语言编写。#include<iostream>#include<cmath>#include<string>usingnamespacestd;constdoublepi=3.14159265;constdoublee=2.9;constintSIZE=1000;typedefstructnode/为了处理符号而建立的链表(如：1+(-2)chardata;node*next;node;typedefstructstack_num/存储数的栈double*top;double*base;stack_num;typedefstructstack_char/

2、存储运算符号的栈char*top;char*base;stack_char;stack_numS_num;/定义stack_charS_char;/定义charfu18='n',')','+','-','*','/','%',，A，,'Q','L','C','S','T','c','s','t','('intpare1000;/表现出各运算符

3、号的优先级doubleshu1000;/存储"数"的数组doubledai_result;/运算的结果，是为了处理M运算(简介函数里有M的定义)intbiao=0;/和dia_result一样，为了处理M运算charlineSIZE;/输入的所要计算的表达式voidinit()/初始化parefu0=-2;/用数字的大小表现出符号的优先级parefu1=-1;parefu2=2;parefu3=2;parefu4=4;parefu5=4;parefu6=4;parefu7=5;for(inti=8;i<=15;i+)parefui=6;parefu16=7;S_num

4、.base=(double*)malloc(sizeof(double)*SIZE);/为栈开辟空间S_char.base=(char*)malloc(sizeof(char)*SIZE);/同上S_num.top=S_num.base;S_char.top=S_char.base;voidpush_num(doublen)/数字进栈+S_num.top=n;voidpush_char(charc)/运算符号进栈+S_char.top=c;doublepop_num()/数字出栈doublem=*S_num.top;S_num.top-;returnm;charpop_char()/运算符号出

5、栈charcc=*S_char.top;S_char.top-;returncc;charget_top_char()/得到运算符号的栈中最顶端的运算符号return*S_char.top;doubleoperate(doubley,charc,doublex)/对两个数计算(含是双目运算符：如*，/等等)(doubler;if(c='-')r=x-y;elseif(c='+')r=x+y;elseif(c='/'&&y!=0)r=x/y;elseif(c='*')r=x*y;elseif(c=，A，)(r=1;f

6、or(inti=1;i<=y;i+)r*=x;elseif(c='%')(intr0=(int)x%(int)y;r=double(rO);returnr;doubleoperate_one(doubleone,charcc)/对一个数运算(含单目运算符：如log(L),sin(S)等等)(doubler;if(cc='Q')r=sqrt(one);elseif(cc='C')r=cos(one);elseif(cc='S')r=sin(one);elseif(cc='T')r=tan(one);elseif

7、(cc='c')r=acos(one);elseif(cc='s')r=asin(one);elseif(cc='t')r=atan(one);returnr;doubleoperate_L(doublea,doubleb,chardian)/求对数的值(doubler=log(b)/log(a);returnr;doublepute()/对整个表达式的计算(charc;/表示运算符号intp=0;/用于shu+p,先初始化inti,j;init();/进展初始化push_char('n');linestrlen(line)=&#

8、39;n'linestrlen(line)+1='0'if(biao)push_num(dai_result);/把运算的结果先进栈，在这个结果的根底上继续进展运算biao=0;for(i=0;linei!='0')/把表达式中的数字字符串转化成可计算的数字(intflag=0;intflag1=1;/标记是否是运算符号/intflag2=1;/标记是否出现'_'doubleh=0;intge;/位数intbiao_dian=0;/是否是小数的类型while(1)(flag1=1;for(j=0;j<=16;j+)(if(linei

9、=fuj)(flag1=0;break;if(linei='_')(break;if(linei='.')(i+；ge=0;biao_dian=1;if(linei='P')(shu+p=pi;i+;break;if(linei='E')(shu+p=e;i+;break;if(flag1)(h=h*10+(linei-'0');flag=1;i+;if(biao_dian)ge+;elsebreak;if(flag)(if(biao_dian)(intr=1;for(intk=1;k<=ge;k+)r*=1

10、0;h/=r;shu+p=h;/把转化而来的数字存于数组if(linei='+')shu+p=-1;elseif(linei=shu+p=-2;elseif(linei='*')shu+p=-3;elseif(linei=7')shu+p=-4;elseif(linei='%')shu+p=-5;elseif(linei=，A，)shu+p=-6;elseif(linei='Q')shu+p=-7;elseif(linei='L')shu+p=-8;elseif(linei='C')shu+

11、p=-9;elseif(linei='S')shu+p=-10;elseif(linei='T')shu+p=-11;elseif(linei='c')shu+p=-12;elseif(linei='s')shu+p=-13;elseif(linei='t')shu+p=-14;elseif(linei='(')shu+p=-15;elseif(linei=')')shu+p=-16;elseif(linei='n')shu+p=-17;i+；)i=1；while(s

12、hui!=-17|get_top_char()!='n')doublem=shui;if(m>=0)push_num(m);i+；elseif(m=-c=1)'+'；elseif(m=-2)c=11.Jelseif(m=-3)c=elseif(m=-4)c=7'；elseif(m=-5)c=elseif(m=-6)c=jelseif(m=-7)c='Q'；elseif(m=-8)c='L'；elseif(m=-9)c='C;elseif(m=-10)c='S'；elseif(m=-11)c=T

13、;elseif(m=-12)c='C;elseif(m=-13)c='s'elseif(m=-14)c=''t'；elseif(m=-15)c=1elseif(m=-16)c='elseif(m=-17)c='n'charch=get_top_char();/得到最顶端运算符号if(parech<parec)/运算符号级别的比拟push_char(c);i+；elseif(ch='('&&c=')')(pop_char();i+；elseif(parech>=pa

14、rec&&ch!='('&&ch!='n')(if(ch='Q'|ch='C'|ch='S'|ch='T'|ch='c'|ch='s'|ch='t')(doubleone=pop_num();chardian=pop_char();push_num(operate_one(one,dian);elseif(ch='L')(doubleone_L=pop_num();doubletwo_L=pop_num(

15、);chardian=pop_char();push_num(operate_L(two_L,one_L,dian);else(doublex=pop_num();doubley=pop_num();chardian=pop_char();if(dian='/'&&x=0)/判断是否除了"零"(cout<<"由于您除了零，结果将是错误的"<<endl;push_num(operate(x,dian,y);/把进展一次计算的结果入栈else(push_char(c);i+;doubleresult=p

16、op_num();/得至V结果returnresult;intcheck_kuohao()/检查表达式括号是否匹配inti,f=0;intkuoSIZE,key=1;memset(kuo,0,sizeof(kuo);for(i=0;linei!='0'i+)if(linei='(')kuo+f=1;elseif(linei=')')if(kuof=1)kuof=0;f-；)elsekey=0;break;)if(key&&f=0)return1;elsereturn0;)intcheck_char()/检查运算符号是否合法(如:1

17、+*4)inti,ge;for(i=0;linei!='0')(ge=0;while(linei='+'|linei=|linei=|linei=7'|linei='%'|linei=，A，|linei='Q'|linei='L'|linei='S'|linei='C|linei='T'|linei='s'|linei='c'|linei='t')ge+;i+；i+；if(ge>=3)return0;elseret

18、urn1;voidoutput(doubleresult)/打出结果(printf("所得结果是：");cout<<result<<endl;voidcheck()/检查表达式是否合法(voidintroduce();charcc;/决定计算器按哪种功能进展计算doubleresult;/结果voidinput();/定义if(check_kuohao()&&check_char()/看是否合法，合法那么计算(result=pute();output(result);cout<<”输入一个字符M'或'D&#

19、39;或'F',决定是否继续："<<endl;while(cin>>cc)(if(cc='M')(system("cls");introduce();printf("您上次所得结果为：");cout<<result<<endl;cout<<"在上次计算结果的根底上，请继续输入想计算的表达式"<<endl;dai_result=result;biao=1;input();/输入表达式break;elseif(cc='

20、D')system("cls");introduce();cout<<"计算器已清零，请输入您所要计算的表达式"<<endl;input();/输入表达式break;elseif(cc='F')(system("cls");cout<<"计算器关闭，谢谢使用!"<<endl;break;else(cout<<"所输入字符无效，请输入一个字符M'或'D'或'F'!”<<en

21、dl;continue;else/不合法，分两种不合法(if(check_kuohao()=0&&check_char()=1)(cout<<"您所输入的表达式括号不匹配，请重新输入："<<endl;input();/输入表达式else(cout<<"您所输入的表达式不合法，请重新输入:"<<endl;input();/输入表达式voidtackle_fuhao()/处理负号(node*root,*head,*p,*q,*p1;root=head=newnode;head->next=

22、NULL;inti;for(i=0;linei!='0'i+)/建立链表(p=newnode;p->data=linei;p->next=head->next;head->next=p;head=p;/deletep;q=(node*)malloc(sizeof(node);head=root;if(root->next->data='+'|root->next->data='-')/处理第一个字符p=newnode;p->data='0'p->next=head->

23、;next;head->next=p;if(root->next!=NULL)for(q=root->next;q;q=q->next)if(q->data='('&&(q->next->data='-'|q->next->data='+')p=newnode;p->data='0'p->next=q->next;q->next=p;/deleteq;p1=newnode;intqi=-1;for(p1=root->next;p1;

24、p1=p1->next)line+qi=p1->data;line+qi='0'voidinput()/输入cin>>line;if(biao=0)tackle_fuhao();/处理负号check();/检查表达式是否合法voidintroduce()/对计算器的符号功能的简要介绍(cout<<"计算器简要介绍"<<endl;cout<<"C(cos)S(sin)T(tan)a(arccos)c(arcsin)"<<endl;cout<<"789/ont(arctan)"<<endl;cout<<"456*%L(log)"<<endl;cout<<"123-M(M+)Q(sqrt)"<<endl;cout<<"0.+A(a)F(off)Enter(=)"<<en