C++编译问题，求大神

答案:4 mip版

解决时间 2021-01-09 02:29

提问者网友：萬裏夢魂
2021-01-08 02:26

int main()
{
int n;
vector v;
string s;
cin>>n;
for(int i=0;i {
cin>>s;
v.push_back(s);
}

int size=v.size();
for(i=0;i {
char *str=reverse(v[i].c_str());
v[i].erase(0,v[i].size());
v[i].insert(0,str);
cout< delete []str;
}
return 0;
}
char* reverse(const char *s)
{
int len=strlen(s);
char *str=new char[len+1];
strcpy(str,s);
char* p=str,*q=p+len-1;
char c;
while(p!=q&&p {
c=*p;
*p=*q;
*q=c;
p++;
q--;
}
return str;
}

Main.cc: In function 'int main()': Main.cc:20:6: error: name lookup of 'i' changed for ISO 'for' scoping [-fpermissive] Main.cc:20:6: note: (if you use '-fpermissive' G++ will accept your code) Main.cc: In function 'char* reverse(const char*)': Main.cc:32:18: error: 'strlen' was not declared in this scope Main.cc:34:14: error: 'strcpy' was not declared in this scope

最佳答案

二级知识专家网友：刺眼的青春
2021-01-08 03:19

只该了语法错误，没看逻辑
#include
#include
#include
using namespace std;
char* reverse(const char *s);  // 声明函数
int main()
{
int n;
vector v;
string s;
int i;  // i在这里定义
cin>>n;
for(i=0;i {
cin>>s;
v.push_back(s);
}

int size=v.size();
for(i=0;i {
char *str=reverse(v[i].c_str());
v[i].erase(0,v[i].size());
v[i].insert(0,str);
cout< delete []str;
}
return 0;
}
char* reverse(const char *s)
{
int len=strlen(s);
char *str=new char[len+1];
strcpy(str,s);
char* p=str,*q=p+len-1;
char c;
while(p!=q&&p {
c=*p;
*p=*q;
*q=c;
p++;
q--;
}
return str;
}

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