【sscanf、结构体排序】2012年北理复试上机题

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http://www.cnblogs.com/lyq105/archive/2009/11/28/1612677.html

#include <iostream>
#include <stdio.h>
#include <string>
#include <algorithm>
using namespace std;
 
struct Stu
{
    int num;
    string name;
    string sex;
    int age;
};
 
bool cmp(Stu a,Stu b)
{
    return a.num<b.num;
}
 
int main()
{
    char op[105];
    int i,num,age,n=3;
    Stu stu[105];
    stu[0].num=10;stu[0].name="wes";stu[0].sex="f";stu[0].age=23;
    stu[1].num=20;stu[1].name="ert";stu[1].sex="f";stu[1].age=45;
    stu[2].num=30;stu[2].name="str";stu[2].sex="t";stu[2].age=89;
 
    while(1)
    {
        gets(op);
 
        if(op[0]=='0')
            break;
        else if(op[0]=='I')//插入
        {
            char name[105],sex[105];
            int num,age;
 
            sscanf(op,"I%d,%[^,],%[^,],%d",&num,name,sex,&age);//sscanf用法
            stu[n].num=num;
            stu[n].name=name;
            stu[n].sex=sex;
            stu[n].age=age;
            n++;
 
            sort(stu,stu+n,cmp);
 
            for(i=0; i<n-1; i++)
                cout<<"("<<stu[i].num<<","<<stu[i].name<<","<<stu[i].sex<<","<<stu[i].age<<"),";
            cout<<"("<<stu[n-1].num<<","<<stu[n-1].name<<","<<stu[n-1].sex<<","<<stu[n-1].age<<")"<<endl;
        }
        else if(op[0]=='D')//删除
        {
            int t;
            sscanf(op,"D%d",&t);
            for(i=0; i<n; i++)
            {
                if(stu[i].num==t)
                {
                    if(i==n-1)
                    {
                        n--;
                    }
                    else
                    {
                        stu[i].num=stu[n-1].num;
                        stu[i].name=stu[n-1].name;
                        stu[i].sex=stu[n-1].sex;
                        stu[i].age=stu[n-1].age;
                        n--;
                    }
                    break;
                }
            }
 
            sort(stu,stu+n,cmp);
 
            for(i=0; i<n-1; i++)
                cout<<"("<<stu[i].num<<","<<stu[i].name<<","<<stu[i].sex<<","<<stu[i].age<<"),";
            cout<<"("<<stu[n-1].num<<","<<stu[n-1].name<<","<<stu[n-1].sex<<","<<stu[n-1].age<<")"<<endl;
        }
    }
 
    return 0;
}