九度+计算表达式模拟+scanf读取数据的灵活运用和运算级的处理

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///不带括号的运算。以及对scanf读取数据深刻理解而运用。#include<stdio.h>#include<stdlib.h>#include<string.h>#include<string>#include<cstring>#include<iostream>#include<algorithm>#include<math.h>#include<cstdio>#define maxn 2050#define INF 0x3f3f3f3f#define mod 1e9+7#define LL long long#define MAX 2000using namespace std;float Stack[MAX];int tail = 0;int main(){int a;///ifstream cin("data.txt");while (scanf("%d",&a)!=EOF){tail = 0;Stack[tail] = (float)a;char algo = getchar();  ///algo表示运算符或者换行符while (algo != '\n' && (algo =='+'||algo =='-'||algo=='*'||algo =='/')){///这儿要加上判断是否是运算符符号的条件scanf("%d", &a);if (algo == '+')///这里就是计算顺序。Stack[++tail] = (float)a;else if (algo == '-')Stack[++tail] = -(float)a;else if (algo == '*')Stack[tail] = Stack[tail] * (float)a;else if (algo == '/')Stack[tail] = Stack[tail] / (float)a;algo = getchar();}int result = 0;for (int i = 0; i <= tail; i++)result += Stack[i];printf("%d\n", result);}return 0;}

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