C语言实现字符串拼接和拷贝

本文实例为大家分享了C语言实现字符串拼接和拷贝的具体代码，供大家参考，具体内容如下

字符串拼接：

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

char *str_contact(const char *,const char *);

char *str_contact(const char *str1,const char *str2)
{
char *result = (char*) malloc(strlen(str1) + strlen(str2) + 1);
if(!result)
{
 printf("Error: malloc failed in concat! \n");
 exit(EXIT_FAILURE);
}

char *temp = result;
while(*str1 != '\0')
{
 *result++ = *str1++;
}

while((*result++ = *str2) != '\0')
{
 ；
}

return temp;
}

int main(void)
{
char *ch1 = "string_";
char * ch2 = "_contact";
char *result = NULL;
result = str_contact(ch1,ch2);
print("result = ％s\n",result);
free(result);
result = NULL;
return 0;
}

字符串拷贝：

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

char *strcpy(char *dst,const char *src)
{
assert(*dst != NULL && *src!=NULL);
char *temp = dst;
while(*src!='\0')
{
*dst++ = *src++;
}
*dst = '\0';

return temp;
}

int main(void)
{
char *ch1 = "str_cpy";
char *ch2;
char *result = strcpy(ch2,ch1);
printf("result = ％s\n",result);
free(result);
result = NULL;
return 0;
}

小编再为大家分享一段之前收藏的代码，感谢原作者的分享。

C++字符串拼接功能描述：实现在字符串末尾拼接字符串

#include <iostream>
#include <string>
using namespace std;
//string& operator+=(const char* str); //重载+= 操作符
//string& operator+=(const char c); //重载+= 操作符
//string& operator+=(const string& str); //重载+= 操作符
//string& append(const char* s); //把字符串s连接到当前字符串结尾
//string& append(const char* s, int n); //把字符串的前n个字符赋给当前的字符串
//string& append(const string& s); //把字符串s赋给当前字符串
//string& append(int n, char c); //用n个字符赋给当前字符串

void test01()
{
string str1 = "我";
str1 += "爱玩游戏";
cout << "str1 = " << str1 << endl;
str1 += ":";
cout << "str1 = " << str1 << endl;

string str2 = "LOL DNF";
str1 += str2;
cout << "str1 = " << str1 << endl;

string str3 = "I";
str3.append(" love ");
str3.append("game abcde", 4);
//str3.append(str2);
cout << "str3 = " << str3 << endl;
//lol dnf str3 = i love game
str3.append(str2, 4, 3); //从下标4位置开始， 截取3个字符，拼接到字符串末尾
cout << "str3 = " << str3 << endl;
}
int main()
{
test01();
return 0;
}

来源：https://blog.csdn.net/u011086367/article/details/54648032