整数的四则运算的运算器（逆波兰式的运用）代码,C代码库,德仔网

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【C】整数的四则运算的运算器（逆波兰式的运用）

作者:li362927450 / 发布于2014/6/4/ 556


	#include<iostream>
	#include<stack>
	using namespace std;
	class Calculator { // 整数的加减乘除运算器
	private:
	 string Polish;
	 long int result;
	public:
	 Calculator() {
	 }
	 long int& getResult(string exp) {
	 Polish.clear();
	 stack<char> s1,s2;
	 s1.push('#'); //以#号作为标记
	 char temp;
	 for(int i=0; i<exp.length(); i++) { //利用两个堆栈生成逆波兰式
	 if (exp[i] >= '0' && exp[i] <= '9') {
	 s2.push(exp[i]);
	 } else if (exp[i] == '+' || exp[i] == '-' ||exp[i] == '*' ||exp[i] == '/') {
	 s2.push('#');
	 temp = s1.top();
	 if(temp == '#'||(temp == '+' || temp == '-')&&(exp[i] == '*' ||exp[i] == '/')) {
	 s1.push(exp[i]);
	 } else {
	 while (!(temp=='#'||temp == '(' || (temp == '+' || temp == '-') && (exp[i] == '*' ||exp[i] == '/'))) {
	 s2.push(temp);
	 s1.pop();
	 temp = s1.top();
	 }
	 s1.push(exp[i]);
	 }
	 } else if(exp[i] == ')'|| exp[i] == '(') {
	 if(exp[i] == '(') {
	 s1.push(exp[i]);
	 } else {
	 temp = s1.top();
	 while (temp != '(' ) {
	 s2.push(temp);
	 s1.pop();
	 temp = s1.top();
	 }
	 s1.pop();
	 }
	 }
	 }
	 while(s1.top()!='#') {
	 s2.push(s1.top());
	 s1.pop();
	 }
	 for(;s2.size()>=1;) {
	 Polish.push_back(s2.top());
	 s2.pop();
	 }
	 long int temp2;
	 long int temp3;
	 long int temp1=0;
	 stack<long int> s3;
	 bool sign =0;
	 for(int i = Polish.length()-1; i >= 0; i--) { //进行逆波兰式的运算
	 if(Polish[i] >= '0' && Polish[i] <= '9') {
	 temp1 = temp1*10 + Polish[i]-'0';
	 sign = 1;
	 }
	 if((Polish[i] == '#'||Polish[i] == '+'||Polish[i] == '-'||Polish[i] == '*'||Polish[i] == '/')&&(sign == 1)||(i == 0&&sign == 1)) {
	 if(sign == 1){
	 s3.push(temp1);
	 temp1 = 0;
	 sign = 0;
	 }
	 }
	 if(Polish[i] == '+'||Polish[i] == '-'||Polish[i] == '*'||Polish[i] == '/') {
	 temp2 =s3.top();
	 s3.pop();
	 temp3 =s3.top();
	 s3.pop();
	 switch(Polish[i]) {
	 case '+':
	 s3.push(temp3+temp2);break;
	 case '-':
	 s3.push(temp3-temp2);break;
	 case '*':
	 s3.push(temp3*temp2);break;
	 case '/':
	 s3.push(temp3/temp2);break;
	 }
	 }
	 }
	 result = s3.top();
	 return result;
	 }
	};
	int main()
	{
	Calculator c; //对各种极端情况进行验证
	cout<<c.getResult("3")<<endl;
	cout<<c.getResult("((3+4)*5+6)*7")<<endl;
	cout<<c.getResult("1+2*3")<<endl;
	cout<<c.getResult("2*5+10")<<endl;
	cout<<c.getResult("3*(5+4)")<<endl;
	cout<<c.getResult("(4+5)*(2+2)")<<endl;
	cout<<c.getResult("1/2+1/2")<<endl;
	cout<<c.getResult("0+0")<<endl;
	cout<<c.getResult("4*5-7*8")<<endl;
	cout<<c.getResult("378+456-500*12/2")<<endl;
	cout<<c.getResult("((11*(12+13)*(14+15))+(16+17))*(18+19)")<<endl;
	cout<<c.getResult("4+5")<<endl;
	cout<<c.getResult("4")<<endl;
	cout<<c.getResult("77+44-22*33/11")<<endl;
	return 0;
	}

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