如何在C ++中打印2D数组? [英] How to print 2D Arrays in C++?
问题描述
我尝试使用数组在屏幕上打印文本文件,但我不知道为什么它不会出现在文本文件中。
文本文件:
1 2 3 4
5 6 7 8
在应用废弃函数后,在屏幕上显示如下:
1
2
3
4
5
6
7
8
代码:
#include< iostream>
#include< fstream>
#include< stdlib.h>
#include< string>
using namespace std;
const int MAX_SIZE = 20;
const int TOTAL_AID = 4;
void discard_line(ifstream& in);
void print(int print [] [4],int size);
int main()
{
// string evnt_id [MAX_SIZE]; // stores event id
int athlete_id [MAX_SIZE] [TOTAL_AID]; //存储athelete id的列
int total_records;
char c;
ifstream reg;
reg.open(C:\\result.txt);
discard_line(reg);
total_records = 0;
while(!reg.eof())
{
for(int i = 0; i {
reg >> athlete_id [total_records] [i]; // read aid coloumns
}
total_records ++;
reg.get(c);
}
reg.close();
print(athlete_id,total_records);
系统(pause);
return 0;
}
void discard_line(ifstream& in)
{
char c;
do
in.get(c);
while(c!='\\\
');
}
void print(int print [] [4],int size)
{
cout< \tID \t AID< endl;
for(int i = 0; i {
for(int j = 0; j {
cout < print [i] [j]< endl;
}
}
}
您正在每个数字后面打印 std :: endl
。如果你想每行有一行,那么你应该在每行后面打印 std :: endl
。示例:
#include< iostream&
int main(void)
{
int myArray [] [4] = {{1,2,3,4},{5,6,7,8} };
int width = 4,height = 2;
for(int i = 0; i {
for(int j = 0; j< width; ++ j)
{
std :: cout<< myArray [i] [j]< '';
}
std :: cout<< std :: endl;
}
}
命名空间std; 在文件开头被认为是坏习惯,因为它导致一些用户定义的名称(类型,函数等)变得模糊。如果你想避免使用 std ::
穷尽前缀,在小范围内使用使用namespace std;
和其他文件不受影响。
I am trying to print a text file out on screen using arrays, but I'm not sure why it does not appear the way it is in the text file.
The text file:
1 2 3 4
5 6 7 8
Displayed on the screen as follows after applying discard function:
1
2
3
4
5
6
7
8
The code:
#include <iostream>
#include <fstream>
#include <stdlib.h>
#include <string>
using namespace std;
const int MAX_SIZE = 20;
const int TOTAL_AID = 4;
void discard_line(ifstream &in);
void print(int print[][4] , int size);
int main()
{
//string evnt_id[MAX_SIZE]; //stores event id
int athlete_id[MAX_SIZE][TOTAL_AID]; //stores columns for athelete id
int total_records;
char c;
ifstream reg;
reg.open("C:\\result.txt");
discard_line(reg);
total_records = 0;
while( !reg.eof() )
{
for (int i = 0; i < TOTAL_AID; i++)
{
reg >> athlete_id[total_records][i] ;//read aid coloumns
}
total_records++;
reg.get(c);
}
reg.close();
print(athlete_id, total_records);
system("pause");
return 0;
}
void discard_line(ifstream &in)
{
char c;
do
in.get(c);
while (c!='\n');
}
void print(int print[][4] , int size)
{
cout << " \tID \t AID " << endl;
for (int i = 0; i < size; i++)
{
for (int j = 0; j < TOTAL_AID; j++)
{
cout << print[i][j] << endl;
}
}
}
You are printing std::endl
after each number. If you want to have 1 row per line, then you should print std::endl
after each row. Example:
#include <iostream>
int main(void)
{
int myArray[][4] = { {1,2,3,4}, {5,6,7,8} };
int width = 4, height = 2;
for (int i = 0; i < height; ++i)
{
for (int j = 0; j < width; ++j)
{
std::cout << myArray[i][j] << ' ';
}
std::cout << std::endl;
}
}
Also note that writing using namespace std;
at the beginning of your files is considered bad practice since it causes some of user-defined names (of types, functions, etc.) to become ambiguous. If you want to avoid exhausting prefixing with std::
, use using namespace std;
within small scopes so that other functions and other files are not affected.
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