C++语言计算器源代码

1、C+语言编写。 #in clude #in clude #in clude using n amespace std; const double pi = 3.14159265; const double e = 2.718281828459; const int SIZE = 1000; typedef struct node/为了处理符号而建立的链表(如：1+(-2) char data; node *n ext; n ode; typedef struct stack_num/ 存储 数 的栈 double *top; double *base; stack_ num; typedef

2、struct stack_char存储 运算符号 的栈 char *top; char *base; stack_char; stack_ num S_num; 定义 stack_char S_char;/ 定义 char fu18 = n, ), +, -, *, /, %, A, Q, L, C, S, T, c, s, t, (; int compare1000;表现出各运算符号的优先级 double shu1000; 存储”数”的数组 double dai_result;/运算的结果，是为了处理M运算(简介函数里有 M的定义) int biao = 0;/ 和 dia_result 一

3、样，为了处理 M 运算 char lineSIZE;输入的所要计算的表达式 void init()/ 初始化 comparefu0 = -2;/用数字的大小表现出符号的优先级 comparefu1 = -1; comparefu2 = 2; comparefu3 = 2; comparefu4 = 4; comparefu5 = 4; comparefu6 = 4; comparefu7 = 5; for(int i = 8; i = 15; i+) comparefui = 6; comparefu16 = 7; S_n um.base = (double*)malloc(sizeof(do

4、uble)*SIZE); 为栈开辟空间 S_char.base = (char*)malloc(sizeof(char)*SIZE); 同上 S_nu m.top = S_nu m.base; S_char.top = S_char.base; void push_num(double n) 数字进栈 * +S _nu m.top = n; void push_char(char c)/ 运算符号进栈 * +S_char.top = c; double pop_ num() 数字出栈 double m = *S_nu m.top; S_nu m.top-; return m; char pop

5、_char()运算符号出栈 char cc = *S_char.top; S_char.top-; return cc; char get_top_char()得到运算符号的栈中最顶端的运算符号 retur n *S_char.top;double operate(double y, char c, double x)对两个数计算(含是双目运算符 double r; if(c =-) r = x - y; else if(c = +) r = x + y; else if(c = / else if(c = *) r = x * y; else if(c = A) r = 1; for(i n

6、t i = 1; i = y; i+) r *= x; else if(c = %) int r0 = (in t)x % (in t)y; r = double(r0); return r; double operate_one(double one, char cc)/对一个数运算(含单目运算符：如 :如*, /等等) log(L), sin(S)等等) double r; if(cc = Q) r = sqrt( on e); else if(cc = C) r = cos( on e); else if(cc = S) r = sin(on e); else if(cc = T) r

7、= tan(on e); else if(cc = c) r = acos( on e); else if(cc = s) r = asin(on e); else if(cc = t) r = ata n(on e); return r; double operate_L(double a, double b, char dian) 求对数的值 double r = log(b) / log(a); return r; double compute。/对整个表达式的计算 char c;/表示运算符号 int p = 0;/用于shu+p,先初始化 int i, j; init();/进行初始

8、化 push_char(n); lin estrle n(l in e) = n： lin estrle n(li ne)+1 = 0; if(biao) push_ num(dai_result);把运算的结果先进栈，在这个结果的基础上继续进行运算 biao = 0; for(i = 0; lin ei != 0;)/把表达式中的数字字符串转化成可计算的数字 int flag = 0; int flag1 = 1;/标记是否是运算符号 / int flag2 = 1;/ 标记是否出现_; double h = 0; in t ge;/ 位数 int biao_dian = 0;/是否是小数的

9、类型 while(1) flag1 = 1; for(j = 0; j = 16; j+) if(li nei = fuj) flag1 = 0; break; if(li nei = _) break; if(li nei=.) i+； ge = 0; biao_dia n = 1; if(li nei = P) shu+p = pi; i+； break; if(li nei = E) shu+p = e; i+; break; if(flag1) h = h * 10 + (li nei - 0); flag = 1; i+; if(biao_dia n) ge+; else break

10、; if(flag) if(biao_dia n) int r = 1; for(i nt k = 1; k = 0) push_ num (m); i+； else if(m =- 1) c = +； else if(m =-2) c = 1 1. else if(m =-3) c = 1*1. 5 else if(m =-4) c = /; else if(m =-5) c = %; else if(m =-6) c = A; 5 else if(m =-7) c = Q; else if(m =-8) c = L; else if(m =-9) c = C; else if(m =-10

11、) c = S; else if(m =-11) c = T; else if(m =-12) c = c; else if(m =-13) c = s; else if(m =-14) c = t; else if(m =-15) c = (; else if(m =-16) c = ); else if(m =-17) c = n; char ch = get_top_char();得到最顶端运算符号 if(comparech = comparec char dia n = pop_char(); push_ num (operate. one(one, dia n); else if(c

12、h = L) double one_L = pop_ num(); double two_L = pop_ num(); char dia n = pop_char(); push_ num (operate_L(two_L, on e_L, dia n); else double x = pop _num(); double y = pop _num(); char dia n = pop_char(); if(dian = / else return 1; void output(double result)/ 打出结果 printf(所得结果是：”)； coutresulte ndl;

13、void check()检查表达式是否合法 void in troduce(); char cc;/决定计算器按哪种功能进行计算 double result;/ 结果 void input();/ 定义 if( check_kuohao() output(result); cout输入一个字符M或D或F,决定是否继续： cc) if(cc = M) system(cls); in troduce(); printf(您上次所得结果为：”)； e ndl; coutresulte ndl; cout在上次计算结果的基础上，请继续输入想计算的表达式 dai_result = result; bia

14、o = 1; in put();/输入表达式 break; else if(cc = D) system(cls); in troduce(); cout计算器已清零，请输入您所要计算的表达式endl; in put();输入表达式 break; else if(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!endl; con ti nue; else/不合法，分两种不合法 if(check_kuohao() = 0 input();输入表达式 else cout您所输入的表达式不合

15、法，请重新输入: next = NULL; int i; for(i = 0; lin ei != 0; i+) 建立链表 p = new node; p-data = lin ei; p-next = head-n ext; head-next = p; head = p; / delete p; q = (no de*)malloc(sizeof( no de); head = root; if(root- next-data = + | root- next-data = -)/ 处理第一个字符 p = new no de; p-data = O; p-next = head-n ext

16、; head-next = p; if(root- n ext != NULL) for(q = root-n ext; q; q = q-n ext) if(q-data = ( p-data = O; p-next = q-n ext; q-next = p; / delete q; pl = new no de; int qi = -1; for(p1 = root-n ext; p1; pl = p1- n ext) lin e+qi = p1-data; lin e+qi = 0; void input() 输入 cin li ne; if(biao = 0) tackle_fuha

17、o(); 处理负号 check();检查表达式是否合法 void introduce（）/对计算器的符号功能的简要介绍 cout计算器简要介绍 e ndl; T(ta n) a(arccos) c(arcs in) e ndl; coutC(cos) S(si n) cout7 8 9 / on t(arcta n) e ndl; cout4 5 6 * % L(log)e ndl; cout1 2 3 - M(M+)Q(sqrt) e ndl; cout0 + A(乘方)F(off) En ter(=) e ndl; cout对于对数输入L2_5表示以2为底5的对数endl; coutM（在前面结果的基础上继续计算，女口：上次结果为10,现输入+10.5*2）endl; coutD（清零并继续输入）endl; coutF（计算机关闭）endl; cout输入P就代表输入圆周率，输入E代表输入自然对数endlendl; void prin t() system(color 2); cout欢迎使用本计算器e