MP3游標移動

標籤：main   游標移動   char   include   ret   pre   last   int start   ring   

#include<iostream>#include<string.h>using namespace std;int main(){    int N;    cin>>N;    int first = 1;    int last = N;    int start = 1;    int length = 4;    int curr = 1;    char str[100];    cin>>str;    int num = strlen(str);    for(int i=0; i<num; i++)    {        char ch = str[i];        if(ch==‘U‘)        {            if(curr == first)            {                start = N<=4 ? start : last - 3;                curr = N;            }            else if(curr == start)            {                start = N<=4 ? start : start - 1;                curr = start;            }            else            {                curr = curr-1;            }        }        else if(ch==‘D‘)        {            if(curr == last)            {                start = 1;                curr = 1;            }            else if(curr == start+length-1)            {                start = start + 1;                curr = curr+1;            }            else            {                curr = curr+1;            }        }        else        {        }    }        for(int i=start; i<start+4; i++)        {            if(i<=last)            {                cout<<i;                if(i!=start+3 && i!= last)                {                    cout<<‘ ‘;                }            }        }        cout<<endl<<curr<<endl;    return 0;}

　　

MP3游標移動