我是 C++ 的初级学生,我遇到了以下代码的问题:
我正在尝试将“换行符”或 "\n"
连接到 char 矩阵中的字符串。
到目前为止,我设法连接了一个 ""
字符,但是字符 "\n"
或只是键入多个 ""
将不起作用。
实际示例是为我定义的 3 个矩阵中的每一个获取 3 个常量值为 10(最大字符)的字符串 - 将值分配给前两个并使用函数“更改”第三个并打印它。
#include <iostream>
#include <string.h>
#include <stdlib.h>
#include <time.h>
using namespace std;
const int LINES = 3;
const int MAXCHARS = 10; //TO DO: change to 81 for final version
void cpyAndCat(char[][MAXCHARS], char[][MAXCHARS], char[][MAXCHARS], int);
void main()
{
char text1[LINES][MAXCHARS], text2[LINES][MAXCHARS], text3[LINES][MAXCHARS];
cout << "Enter " << LINES << " lines into text1:\n";
for (int i = 0; i < LINES; i++) // assign the matrix of chars text1 with strings
{
_flushall();
cin.getline(text1[i], MAXCHARS);
}
cout << "Enter " << LINES << " lines into text2: \n";
for (int i = 0; i < LINES; i++) // assign the matrix of chars text2 with strings
{
_flushall();
cin.getline(text2[i], MAXCHARS);
}
//TO DO: call the function which will recieve text1 and text2
//and put blank line(line too long) or copied line from text1 and catanted line form text2.(long correct size)
cpyAndCat(text1, text2, text3, LINES);
cout << "============================================================\n";
for (int i = 0; i < LINES; i++) // print third matrix of chars, prints 3 lines of either text or '\n'
{
_flushall();
cout << text3[i];
cout << endl;
}
system("pause");
}
void cpyAndCat(char text1[][MAXCHARS], char text2[][MAXCHARS], char text3[][MAXCHARS], int lines)
{
for (int i = 0; i < lines; i++) // searches if length of string from first 2 matrix is valid
{
if (strlen(text1[i]) + strlen(text2[i]) < MAXCHARS) // if so, copy the first to the third and catanate the second to the third
{
strcpy_s(text3[i], text1[i]);
strcat_s(text3[i], text2[i]);
}
else // if else (: , catanate 'new line' to the third matrix
{
strcat_s(text3[i], "\n"); // not working
}
cout << endl;
}
}
最佳答案
strcat_s
和strcpy_s
需要three parameters, not two .我很惊讶你有任何编译。
另外,你strcat
到 text3
而没有初始化它。所以这可能是未定义的行为......
关于c++ - 字符串不以 null 结尾,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20337134/