Question

我在我的数组00,11,22,33中存储了四个数字。当我生成一个随机数并打印它时，它会显示0而不是00（当选择第一个元素时）。其他数字很好，显示正确。如何在阵列中存储00以便正确显示？

#include <stdio.h>
#include <stdlib.h>
#include <time.h>  

int main()
{
    srand(time(NULL));
    int myArray[4] = { 00,11,22,33 };
    int randomIndex = rand() % 4;
    int randomIndex1 = rand() % 4;
    int randomIndex2 = rand() % 4;
    int randomIndex3 = rand() % 4;

    int randomValue = myArray[randomIndex];
    int randomValue1 = myArray[randomIndex1];
    int randomValue2 = myArray[randomIndex2];
    int randomValue3 = myArray[randomIndex3];
    printf("= %d\n", randomValue);
    printf("= %d\n", randomValue1);
    printf("= %d\n", randomValue2);
    printf("= %d\n", randomValue3); 

    return(0);
}

Answer 1

0数字与11数字完全相同，而1显然与00不同。

考虑存储字符串。或者，如果您想显示%02d，则使用printf("= %02d\n", randomValue);作为格式字符串只需2个字符：

int myArray[4] = {0,1,2,3};
. . .
printf("= %d%d\n", randomValue, randomValue);

如果这真的是你的整个程序，你甚至可以修改你的数组，然后两次打印值：

import {User} from '../model';
export class DrawingSocket {
connectedUsers = [];
drawingConnection: any;

constructor(private socketIO: any) {
    this.socketIO.of('/sockets/drawing').on('connection', (con: any) => {
        this.drawingConnection = con;
        this.listen();
    });
    console.log("Drawing socket listening at /sockets/drawing/");
}

private listen(): void {
    this.drawingConnection.on("drawing", (data: any) => {
        console.log("[DRAWING] Room "+data.room);
        this.drawingConnection.to(data.room).emit("draw", data);
    });


    this.drawingConnection.on("clear", (data: any) => {
        console.log("[DRAWING] CLEAR for room "+data.room);
        this.drawingConnection.to(data.room).emit("clear", data);
    });

    this.drawingConnection.on("login", (user: any) => {
        this.drawingConnection.join(user.room);
        this.connectedUsers[user._id] = user;
        this.drawingConnection.to(user.room).emit("userlist", this.getSimpleUserList());
        this.drawingConnection.emit("userlist", this.getSimpleUserList());
        console.log("User " + user.name + " joined room " + user.room);
        console.log(JSON.stringify(this.socketIO.rooms));

    });

    this.drawingConnection.on("logout", (user: any) => {
        var room = this.connectedUsers[user._id].room;
        this.drawingConnection.to(room).emit("userlist", this.getSimpleUserList());
        this.drawingConnection.leave(room);
        console.log("User " + user.name + " disconnecting from room " + room + ".");
    });

    this.drawingConnection.on("disconnect", () => {
        //leave room and such
    });
}

private getSimpleUserList() {
    let list = this.connectedUsers.map((user) => user.login);
    return list;
}
}

Answer 2

%02d扫描代码将打印零填充的随机数：

printf("%02d\n", randomValue);
// Expected output for 0: 00
                          ^
                     This 0 belongs to the scan code

此外，%2d扫描代码将为您执行空格填充：

printf("%2d\n", randomValue);
// Expected output for 0:  0
                          ^
                     This space belongs to the scan code

一般来说，%(0)NM是一个扫描码，其中包含：

0是可选的，它属于数字，如果使用它，它将向输出添加零填充;如果没有使用它，它将添加空格填充。
N是您要打印的位数/字符数，例如2。
M是您要显示数据类型的扫描代码，例如{d, x, c, s, ...}代表{number, hexadecimal number, character, string, ...}

您可以找到完整的扫描代码列表here。

如何在数组中存储00？

2 个答案: