#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>
#include<time.h>
//使用系统函数strcmp、strncmp
int main0101()
{
//ch1=ch2,则返回0；ch1<ch2,则返回负数；ch1>ch2,则返回正数
char ch1[]="hallo world";
char ch2[]="hello world";
//比较字符串
//int value=strcmp(ch1,ch2);
//比较前n个字符
//int value=strncmp(ch1,ch2,5)
//printf("%d ",value);
//把字符串是否相等作为条件判断
if(!strcmp(ch1,ch2)
{
printf("相同 ");
}
else
{
printf("不相同 ");
}
return EXIT_SUCCESS;
}
//自定义函数strcmp
int my_strcmp01(const char*s1,const char*s2)
{
while(*s1==*s2)
{
if(*s1==' ')
{
return 0;
}
s1++;
s2++;
}
return *s1<*s2 ? 1 : -1 ;
}
//自定义函数strncmp
int my_strncmp(const char*s1,const char*s2,size_t n)
{
for(int i=0;i<n && s1[i] && s2[i] ; i++)
{
if(s1[i]!=s2[i])
{
return s1[i]>s2[i] ? 1:-1;
}
return 0;
}
}
int main()
{
char ch1[]="hallo world";
char ch2[]="hello world";
//自定义函数strcmp
//int value=my_strcmp(ch1,ch2);
//自定义函数strncmp
int value=my_strncmp(ch1,ch2,5);
printf("%d ",value);
return 0;
}