1.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; }
2.strlen 获取字符串长度
4.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; }
5.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); if (!strncmp(str1, str2, 3)) printf("两个字符串,前三位相等"); system("pause"); return 0; }
6.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; }
7.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; }
8.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; }
9.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; }
10.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; }
11.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; }
12.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; }
13.自己实现寻找字符串子串:
#include <stdio.h> #include <stdlib.h> // 查找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); system("pause"); return 0; }
14.删除字符串中连续字符
#include <stdio.h> char del(char s[],int pos,int len) //自定义删除函数，这里采用覆盖方法 { int i; for (i=pos+len-1; s[i]!=‘\0‘; i++,pos++) s[pos-1]=s[i]; //用删除部分后的字符依次从删除部分开始覆盖 s[pos-1]=‘\0‘; return s; } int main(int argc, char *argv[]) { char str[50]; int position,length; printf ("please input string:\n"); gets(str); //使用gets函数获得字符串 printf ("please input delete position:"); scanf("%d",&position); printf ("please input delete length:"); scanf("%d",&length); del(str,position,length); printf ("the final string:%s\n",str); return 0; }
原文：https://www.cnblogs.com/ruiyao18369/p/14758241.html