CC++字符串拷贝处理⽂章阅读⽬录
C语⾔的字符串操作
strtok 实现字符串切割: 将字符串根据分隔符进⾏切割分⽚.
#include <stdio.h>
int main(int argc, char* argv[])
{
char str[] = "hello,lyshark,welcome";
char *ptr;
ptr = strtok(str, ",");
while (ptr != NULL)
{
printf("切割元素: %s\n", ptr);
ptr = strtok(NULL, ",");
}
system("pause");
return 0;
}
strlen 获取字符串长度:
#include <stdio.h>
int main(int argc, char* argv[])
{
char Array[] = "\0hello\nlyshark";
char Str[] = { 'h', 'e', 'l', 'l', 'o' };
int array_len = strlen(Array);
printf("字符串的有效长度：%d\n", array_len);
int str_len = strlen(Str);
printf("字符串数组有效长度: %d\n", str_len);
int index = 0;
while (Str[index] != '\0')
{
index++;
printf("Str数组元素: %c --> 计数: %d \n", Str[index], index);
}
system("pause");
return 0;
}
strcpy 字符串拷贝:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char* argv[])
{
char Array[] = "hello lyshark";
char tmp[100];
/
/ 学习strcpy函数的使⽤⽅式
if (strcpy(tmp, Array) == NULL)
printf("从Array拷贝到tmp失败\n");
else
printf("拷贝后打印: %s\n", tmp);
// 清空tmp数组的两种⽅式
for (unsigned int x = 0; x < strlen(tmp); x++)
tmp[x] = ' ';
memset(tmp, 0, sizeof(tmp));
// 学习strncpy函数的使⽤⽅式
if (strncpy(tmp, Array, 3) == NULL)
printf("从Array拷贝3个字符到tmp失败\n");
else
printf("拷贝后打印: %s\n", tmp);
system("pause");
return 0;
}
strcat字符串连接: 将由src指向的空终⽌字节串的副本追加到由dest指向的以空字节终⽌的字节串的末尾#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char* argv[])
{
char str1[50] = "hello ";
char str2[50] = "lyshark!";
char * str = strcat(str1, str2);
printf("字符串连接: %s \n", str);
str = strcat(str1, " world");
printf("字符串连接: %s \n", str);
str = strncat(str1, str2, 3);
printf("字符串连接: %s \n", str);
system("pause");
return 0;
}
strcmp 字符串对⽐:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int Str_Cmp(const char * lhs, const char * rhs)
{
int ret = strcmp(lhs, rhs);
if (ret == 0)
return 1;
else
return 0;
}
int main(int argc, char* argv[])
{
char *str1 = "hello lyshark";
char *str2 = "hello lyshark";
int ret = Str_Cmp(str1, str2);
printf("字符串是否相等: %d \n", ret);字符串拷贝函数strcpy作用
if (!strncmp(str1, str2, 3))
printf("两个字符串，前三位相等");
system("pause");
return 0;
}
strshr 字符串截取:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char* argv[])
{
const char str[] = "hello ! lyshark";
char *ret;
ret = strchr(str, '!');
printf("%s \n", ret);
system("pause");
return 0;
}
字符串逆序排列:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void Swap_Str(char *Array)
{
int len = strlen(Array);
char *p1 = Array;
char *p2 = &Array[len - 1];
while (p1 < p2)
{
char tmp = *p1;
*p1 = *p2;
*p2 = tmp;
p1++, p2--;
}
}
int main(int argc, char* argv[])
{
char str[20] = "hello lyshark";
Swap_Str(str);
for (int x = 0; x < strlen(str); x++)
printf("%c", str[x]);
system("pause");
return 0;
}
实现字符串拷贝:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/
/ 使⽤数组实现字符串拷贝
void CopyString(char *dest,const char *source)
{
int len = strlen(source);
for (int x = 0; x < len; x++)
{
dest[x] = source[x];
}
dest[len] = '\0';
}
// 使⽤指针的⽅式实现拷贝
void CopyStringPtr(char *dest, const char *source)
{
while (*source != '\0')
{
*dest = *source;
++dest, ++source;
}
*dest = '\0';
}
// 简易版字符串拷贝
void CopyStringPtrBase(char *dest, const char *source) {
while (*dest++ = *source++);
}
int main(int argc, char* argv[])
{
char * str = "hello lyshark";
char buf[1024] = { 0 };
CopyStringPtrBase(buf, str);
printf("%s \n", buf);
system("pause");
return 0;
}
格式化字符串:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char* argv[])
{
// 格式化填充输出
char buf[30] = { 0 };
sprintf(buf, "hello %s %s", "lyshark","you are good"); printf("格式化后: %s \n", buf);
// 拼接字符串
char *s1 = "hello";
char *s2 = "lyshark";
memset(buf, 0, 30);
sprintf(buf, "%s --> %s", s1, s2);
printf("格式化后: %s \n", buf);
// 数字装换位字符串
int number = 100;
memset(buf, 0, 30);
sprintf(buf, "%d", number);
printf("格式化后: %s \n", buf);
system("pause");
return 0;
}
动态存储字符串:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char* argv[])
{
// 分配空间
char **p = malloc(sizeof(char *)* 5);
for (int x = 0; x < 5;++x)
{
p[x] = malloc(64);
memset(p[x], 0, 64);
sprintf(p[x], "Name %d", x + 1);
}
// 打印字符串
for (int x = 0; x < 5; x++)
printf("%s \n", p[x]);
// 释放空间
for (int x = 0; x < 5; x++)
{
if (p[x] != NULL)
free(p[x]);
}
system("pause");
return 0;
}
字符串拼接:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char * StringSplicing(char *String1, char  *String2) {
char Buffer[1024];
int index = 0;
int len = strlen(String1);
while (String1[index] != '\0')
{
Buffer[index] = String1[index];
index++;
}
while (String2[index - len] != '\0')
{
Buffer[index] = String2[index - len];
index++;
}
Buffer[index] = '\0';
char *ret = (char*)calloc(1024, sizeof(char*));
if (ret)
strcpy(ret, Buffer);
return ret;
}
int main(int argc, char* argv[])
{
char *str1 = "hello ";
char *str2 = "lyshark ! \n";
char * new_str = StringSplicing(str1, str2);
printf("拼接好的字符串是: %s", new_str);
system("pause");
return 0;
}
实现strchr:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char * MyStrchr(const char *String, char ch)
{
char *ptr = String;
while (*ptr != '\0')
{
if (*ptr == ch)
return ptr;
ptr++;
}
return NULL;
}
int main(int argc, char* argv[])
{
char Str[] = "hello lyshark";
char ch = 's';
char *ptr = MyStrchr(Str, ch);
printf("输出结果: %s \n", ptr);
system("pause");
return 0;
}
⾃⼰实现寻字符串⼦串:
#include <stdio.h>
#include <stdlib.h>
// 查⼦串第⼀次出现的位置
char *MyStrStr(const char* str, const char* substr) {
const char *mystr = str;
const char *mysub = substr;
while (*mystr != '\0')
{
if (*mystr != *mysub)
{
++mystr;
continue;
}
char *tmp_mystr = mystr;
char *tmp_mysub = mysub;
while (tmp_mysub != '\0')
{
if (*tmp_mystr != *tmp_mysub)
{
++mystr;
break;
}
++tmp_mysub;
}
if (*tmp_mysub == '\0')
{
return mystr;
}
}
return NULL;
}
int main(int argc, char* argv[])
{
char *str = "abcdefg";
char *sub = "fg";
char * aaa = MyStrStr(str, sub);
printf("%s", aaa);

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