www.txt

超级圣斗士

#include<iostream.h> 
#include<stdlib.h> 
#include<ctype.h> 
int add(); 
int mul(); 
int number(); 
void error(); 
static char exp[81]; 
static int pos; 
int main(){ 
int ans; 
do 
{ 
pos=0; 
cout<<"请输入表达式"<<endl; 
cin>>exp; 
ans=add(); 
if(exp[pos]!='\0') 
error(); 
if(ans!=0) 
cout<<ans<<endl; 
}while(ans!=0); 
return 0; 
} 
int add() 
{ 
int rtn=mul(); 
while(exp[pos]=='+'||exp[pos]=='-') 
{ 
int op=exp[pos++]; 
int opr2=mul(); 
if(op=='+') 
rtn+=opr2; 
else 
rtn-=opr2; 
} 
return rtn; 
} 
int mul() 
{ 
int rtn=number(); 
while(exp[pos]=='*'||exp[pos]=='/') 
{ 
int op=exp[pos++]; 
int opr2=number(); 
if(op=='*') 
rtn*=opr2; 
else 
rtn/=opr2; 
} 
return rtn; 
} 
int number() 
{ 
int rtn; 
if(exp[pos]=='(') 
{ 
pos++; 
rtn=add(); 
if(exp[pos++]!=')') 
error(); 
return rtn; 
} 
if(!isdigit(exp[pos])) 
error(); 
rtn=atoi(exp+pos); 
while(isdigit(exp[pos])) 
pos++; 
return rtn; 
} 
void error() 
{ 
cout<<'\r'; 
while(pos++) 
cout<<' '; 
cout<<"error"<<endl<<'\a'; 
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}