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Cod sursa(job #531314)
#include <fstream>
using namespace std;
const char InFile[]="evaluare.in";
const char OutFile[]="evaluare.out";
const int MaxN=100111;
ifstream fin(InFile);
ofstream fout(OutFile);
char str[MaxN],*p=str;
int termen();
int factor();
int eval();
int eval()
{
int r=termen();
while(*p=='-' || *p=='+')
{
if(*p=='-')
{
++p;
r-=termen();
}
else
{
++p;
r+=termen();
}
}
return r;
}
int termen()
{
int r=factor();
while(*p=='*' || *p=='/')
{
if(*p=='*')
{
++p;
r*=factor();
}
else
{
++p;
r/=factor();
}
}
return r;
}
int factor()
{
int r=0;
if(*p=='(')
{
++p;
r=eval();
++p;
}
else
{
while('0'<=*p && *p<='9')
{
r*=10;
r+=*p-'0';
++p;
}
}
return r;
}
int main()
{
fin>>str;
fin.close();
fout<<eval();
fout.close();
return 0;
}