46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
#include<stdio.h>
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#include<string.h>
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#include<iostream>
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using namespace std;
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char s[10005];
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int cur, len;
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double solve(){
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double c = 1;
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while(!(s[cur] == '(' || s[cur] >= '0' && s[cur] <= '9' || s[cur] == '-') && cur < len)
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cur++;
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if(s[cur] == '-')
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c = -1, cur++;
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if(s[cur] == '('){
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double w = 0.1, p = 0;
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if(s[++cur] == '.' || s[cur+1] == '.'){
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if(s[cur+1] == '.')
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cur++;
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for(int i = cur + 1; s[i] >= '0' && s[i] <= '9' && s[i]; i++, cur = i)
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p = p + (s[i] - '0') * w, w *= 0.1;
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}
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else
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p = s[cur++] - '0';
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double a, b;
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a = solve();
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b = solve();
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return (a+b)*p + (a-b) * (1-p);
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}
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else{
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double p = 0;
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for(int i = cur; s[i] >= '0' && s[i] <= '9'; i++, cur=i)
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p = p * 10 + (s[i]-'0');
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return c * p;
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}
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}
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int main()
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{
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double p, a, b;
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while(gets(s)&& strcmp(s, "()"))
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{
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len = strlen(s);
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cur = 0;
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printf("%.2lf\n", solve());
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}
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return 0;
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}
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