c++ strchr函数_strchr函数返回_模拟实现strchr函数(11)

输出结果：s1lessthans2

int strncmp(char *str1, char *str2, intmaxlen);

当s1<s2时，返回为负数

当s1=s2时，返回=0

当s1>s2时，返回正数

#include<string.h>

#include<stdio.h>

int main()

{

char *buf1="aaabbb",*buf2="bbbccc",*buf3="ccc";

int ptr;

ptr=strncmp(buf2,buf1,3);

if(ptr>0)

printf("buffer2 is greater than buffer1\n");

else if(ptr<0)

printf("buffer2 is less than buffer1\n");

ptr=strncmp(buf2,buf3,3);

if(ptr>0)

printf("buffer2 is greater thanbuffer3\n");

else if(ptr<0)

printf("buffer2 is less than buffer3\n");

return 0;

}

输出结果：

buffer2 is greater than buffer1

buffer2 is less than buffer3

char *strtok(char s[], const char*delim);

分解字符串为一组字符串。s为要分解的字符串，delim为分隔符字符串。

例如：strtok("abc,def,ghi",",")，最后可以分割成为abc def ghi.

#include<string.h>

#include<stdio.h>

int main()

{

charinput[16]="abc,d,efg";

char *p;

p=strtok(input,",");

while(p)

{

printf("%s\n",p);

p=strtok(NULL,",");

}

return 0;

}

输出结果：abc

d

efg

void *memcpy(void *dest, const void *src,size_t n);

从源src所指的内存地址的起始位置开始拷贝n个字节到目标dest所指的内存地址的起始位置中

#include<stdio.h>

#include<string.h>

int main()

{

char s[]="GoldenGlobalView";

char d[20];

memcpy(d,s12,4);//从第13个字符(V)开始复制，连续复制4个字符

d[4]='\0';//memcpy(d,s14*sizeof(char),4*sizeof(char));也可

printf("%s\n",d);

return 0;

}

输出结果：View

倒置字符串

#include<stdio.h>

#include<string.h>

void reverse(char s[])

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