Question

C++错误：C2065。请各位大虾帮忙调一下代码。好了就给50分

#include "stdio.h"
#include "string.h"
#include "math.h"
char chrs[1001]={0};
int *ck=NULL;
int main()
{
char ch=0;
double tmp=0;
double a=0,b=0,c=0,d=0;
double ans=0;
int len=0,i=0,mark=0,flag=0;
scanf("%s",chrs);
len=strlen(chrs);
ck=(int *)malloc(len*sizeof(int));////////////////////////////////////错误在这行
for(i=0;i<len;i++)
{
if(chrs[i]=='=')
{ck[i]=11; mark=i;}
if(chrs[i]=='+') ck[i]=10;
if(chrs[i]=='-') ck[i]=-10;
if(chrs[i]>='a'&&chrs[i]<='z') {ck[i]=12; flag=i;}
if(chrs[i]>='0'&&chrs[i]<='9') ck[i]=chrs[i]-'0';
}
i=0;
while(i<mark)
{
if(i<mark&&ck[i]==12)
{
a++;
i++;
}
else if(i<mark&&ck[i]>=0&&ck[i]<=9)
{
while(i<mark&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<mark&&ck[i]==12)
{
a+=tmp;
i++;
}
else
{
b+=tmp;
}
tmp=0;
}
else if(i<mark&&ck[i]==10)
{
i++;
if(i<mark&&ck[i]==12)
{
a++;
i++;
continue;
}
while(i<mark&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<mark&&ck[i]==12)
{
a+=tmp;
i++;
}
else
{
b+=tmp;
}
tmp=0;
}
else if(i<mark&&ck[i]==-10)
{
i++;
if(i<mark&&ck[i]==12)
{
a--;
i++;
continue;
}
while(i<mark&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<mark&&ck[i]==12)
｛
a-=tmp;
i++;
}
else
{
b-=tmp;
}
tmp=0;
}
}
i++;
tmp=0;
while(i<len)
{
if(i<len&&ck[i]==12)
{
c+=1;
i++;
}
else if(i<len&&ck[i]>=0&&ck[i]<=9)
{
while(i<len&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<len&&ck[i]==12)
{
c+=tmp;
i++;
}
else
{
d+=tmp;
}
tmp=0;
｝
else if(i<len&&ck[i]==10)
{
i++;
if(i<len&&ck[i]==12)
{
c+=1.0;
i++;
continue;
｝
while(i<len&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
｝
if(i<len&&ck[i]==12)
{
c+=tmp;
i++;
}
else
{
d+=tmp;
}
tmp=0;
}
else if(i<len&&ck[i]==-10)
{
i++;
if(i<len&&ck[i]==12)
{
c-=1.0;
i++;
tmp=0;
continue;
}
while(i<len&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<len&&ck[i]==12)
｛
c-=tmp;
i++;
}
else
{
d-=tmp;
}
tmp=0;
}
}
if(d-b>0&&a-c>0||d-b<0&&a-c<0) ans=abs((d-b)/(a-c));
else ans=(d-b)/(a-c);
printf("%c=%.3lf",chrs[flag],ans);
system("pause");///////////////////////////////////////////错误在这行
return 0;
}
错误原因：
--------------------Configuration: aa - Win32 Debug--------------------
Compiling...
aaa.cpp
c:\program files\microsoft visual studio\myprojects\aa\aaa.cpp(17) : error C2065: 'malloc' : undeclared identifier
c:\program files\microsoft visual studio\myprojects\aa\aaa.cpp(183) : warning C4244: 'argument' : conversion from 'double' to 'int', possible loss of data
c:\program files\microsoft visual studio\myprojects\aa\aaa.cpp(186) : error C2065: 'system' : undeclared identifier
Error executing cl.exe.
aa.exe - 2 error(s), 1 warning(s)

Answer 1

加上
#include "stdafx.h"
#include "stdlib.h"
有5，6个大括号的输入法不对
我在vc6编译通过的

#include "stdafx.h"
#include "stdio.h"
#include "string.h"
#include "math.h"
#include "stdlib.h"
char chrs[1001]={0};
int *ck=NULL;
int main()
{
char ch=0;
double tmp=0;
double a=0,b=0,c=0,d=0;
double ans=0;
int len=0,i=0,mark=0,flag=0;
scanf("%s",chrs);
len=strlen(chrs);
ck=(int *)malloc(len*sizeof(int));////////////////////////////////////错误在这行
for(i=0;i<len;i++)
{
if(chrs[i]=='=')
{ck[i]=11; mark=i;}
if(chrs[i]=='+') ck[i]=10;
if(chrs[i]=='-') ck[i]=-10;
if(chrs[i]>='a'&&chrs[i]<='z') {ck[i]=12; flag=i;}
if(chrs[i]>='0'&&chrs[i]<='9') ck[i]=chrs[i]-'0';
}
i=0;
while(i<mark)
{
if(i<mark&&ck[i]==12)
{
a++;
i++;
}
else if(i<mark&&ck[i]>=0&&ck[i]<=9)
{
while(i<mark&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<mark&&ck[i]==12)
{
a+=tmp;
i++;
}
else
{
b+=tmp;
}
tmp=0;
}
else if(i<mark&&ck[i]==10)
{
i++;
if(i<mark&&ck[i]==12)
{
a++;
i++;
continue;
}
while(i<mark&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<mark&&ck[i]==12)
{
a+=tmp;
i++;
}
else
{
b+=tmp;
}
tmp=0;
}
else if(i<mark&&ck[i]==-10)
{
i++;
if(i<mark&&ck[i]==12)
{
a--;
i++;
continue;
}
while(i<mark&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<mark&&ck[i]==12)
{
a-=tmp;
i++;
}
else
{
b-=tmp;
}
tmp=0;
}
}
i++;
tmp=0;
while(i<len)
{
if(i<len&&ck[i]==12)
{
c+=1;
i++;
}
else if(i<len&&ck[i]>=0&&ck[i]<=9)
{
while(i<len&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<len&&ck[i]==12)
{
c+=tmp;
i++;
}
else
{
d+=tmp;
}
tmp=0;
}
else if(i<len&&ck[i]==10)
{
i++;
if(i<len&&ck[i]==12)
{
c+=1.0;
i++;
continue;
}
while(i<len&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<len&&ck[i]==12)
{
c+=tmp;
i++;
}
else
{
d+=tmp;
}
tmp=0;
}
else if(i<len&&ck[i]==-10)
{
i++;
if(i<len&&ck[i]==12)
{
c-=1.0;
i++;
tmp=0;
continue;
}
while(i<len&&ck[i]>=0&&ck[i]<=9)
{
tmp=tmp*10+ck[i];
i++;
}
if(i<len&&ck[i]==12)
{
c-=tmp;
i++;
}
else
{
d-=tmp;
}
tmp=0;
}
}
if(d-b>0&&a-c>0||d-b<0&&a-c<0) ans=abs((d-b)/(a-c));
else ans=(d-b)/(a-c);
printf("%c=%.3lf",chrs[flag],ans);
system("pause");///////////////////////////////////////////错误在这行
return 0;
}