输入一个数，如果是1295-1344,1381-1420，1570-1574则输出“张三”，否则输出“无此人”；如果是1345-1380，1575-1590,6001-6030,6114-6135则输出“李四”，否则输出“有此人”，请问如何编程？

……否则输出“无此人”……否则输出“有此人”
------ 既非张三又非李四时，到底输出什么？

输错了，不在号码段都是“无此人”

不就是 if 嘛，不知道你哪里不会？

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用C++写个二分法查找的（纯粹找乐）

#include <string>
#include <vector>
#include <utility>
#include <algorithm>

const std::string& foo( unsigned id )
{
    static const std::string nobody = "无此人";
    static const std::vector<std::pair<unsigned,std::string>> buf
        = { {1295,"无此人"}
          , {1345,"张三" }
          , {1381,"李四"}
          , {1421,"张三" }
          , {1570,"无此人"}
          , {1575,"张三" }
          , {1591,"李四"}
          , {6001,"无此人"}
          , {6031,"李四"}
          , {6114,"无此人"}
          , {6136,"李四"} };

    auto itor = std::upper_bound( std::begin(buf), std::end(buf), id
        , [](unsigned id,const auto& value){return id<value.first;} );
    return itor!=std::end(buf) ? itor->second : nobody;
}

#include <cassert>

int main(int argc, char **argv)
{
    assert( foo(1294)=="无此人" );
    assert( foo(1295)=="张三" );
    assert( foo(1344)=="张三" );
    assert( foo(1345)=="李四" );
    assert( foo(1380)=="李四" );
    assert( foo(1381)=="张三" );
    assert( foo(1420)=="张三" );
    assert( foo(1421)=="无此人" );
    assert( foo(1569)=="无此人" );
    assert( foo(1570)=="张三" );
    assert( foo(1574)=="张三" );
    assert( foo(1575)=="李四" );
    assert( foo(1590)=="李四" );
    assert( foo(1591)=="无此人" );
    assert( foo(6000)=="无此人" );
    assert( foo(6001)=="李四" );
    assert( foo(6030)=="李四" );
    assert( foo(6031)=="无此人" );
    assert( foo(6113)=="无此人" );
    assert( foo(6114)=="李四" );
    assert( foo(6135)=="李四" );
    assert( foo(6136)=="无此人" );
}

厉害

#include <stdio.h>

typedef struct id
{
    int id;
    char name[20];
} ID, *PID;

typedef struct dic
{
    int id;
    int start;
    int end;
} DIC, *PDIC;


char *fun_id(int id, ID *stID, int m)
{
    int i;
    for (i=0; i<m; ++i)
        if (stID[i].id == id)
            return stID[i].name;
    return stID[0].name;
}

char *fun_dic(int num, DIC *stDIC, int n, ID *stID, int m)
{
    int i;
    for (i=0; i<n; ++i)
        if (num>=stDIC[i].start && num<=stDIC[i].end)
            return fun_id(stDIC[i].id, stID, m);
    return fun_id(0, stID, m);
}

main()
{
    ID stID[3]={
        0,"无此人",
        1,"张三",
        2,"李四"
    };
    DIC stDIC[7]={
        1, 1295, 1344,
        1, 1381, 1420,
        1, 1570, 1574,
        2, 1345, 1380,
        2, 1575, 1590,
        2, 6001, 6030,
        2, 6114, 6135
    };
    int num;
    scanf("%d", &num);
    printf("%s\n", fun_dic(num,stDIC,7,stID,3));
}

这里有个错误，就是如果输入1344.1的话，还是显示张三，与题目冲突了，所以1344这个值得改，num<=stDIC[i].end这个值也得改，其他stDIC[7]的值也得改

输入的是int类型，结果不会有小数的吧

#include <stdio.h>
void main(void)
{
    int aa[]={1295,1344,1381,1420,1570,1574,1345,1380,1575,1590,6001,6030,6114,6135};
    int i,ii,a,b;
    int x,y;
   
    while (1)
    {
        b=0;
    printf("请输入整数数据\n");
    scanf ("%d",&a);
    for (ii=0;ii<6;ii+=2)
    {
        x=aa[ii];
        y=aa[ii+1];
        for (i=x;i<=y;i++)
    {
        if (i==a)
        { b=printf("张三\n");
           break;
        }
    }
   
    }
        for (ii=6;ii<14;ii+=2)
    {
        x=aa[ii];
        y=aa[ii+1];
        
            for (i=x;i<=y;i++)
    {
        if (i==a)
        { b=printf("李四\n");
          break;
    }
    }
    }

    if (b<=0)
    printf("无此人\n");
    }
}

厉害了   还在看书中。。。