1.字符串数组和字符串指针

#include<stdio.h>
#include<string.h>
#include <stdlib.h>
int main(void)
{
    char* s1  = "hello world";
    char s2[] = "hello world";
    //s1[2] = 'b';   //不可写
    s2[2] = 'b';
    printf("s1的地址是%p\r\n", s1);
    printf("s2的地址是%p\r\n", s2);
    system("pause");
    return 0;
}

2.二维字符串数组的定义

#include<stdio.h>
#include<string.h>
#include <stdlib.h>
int main(void)
{
    char a[][10] = { "" };  //相当于a[0]--->char [10]  字符串长度小于10
    char *a[] = { "" };  //相当于a[0]--->char *  
    system("pause");
    return 0;
}

3.strlen/sizeof区别

#include<stdio.h>
#include<string.h>
#include <stdlib.h>
int main()
{
    char line[] = "asdasd";
    printf("strlen = %lu\n", strlen(line));
    printf("sizeof = %lu\n", sizeof(line));
    system("pause");
    return 0;
}

4.strcmp

#include<stdio.h>
#include<string.h>
#include <stdlib.h>
int main()
{
    char* s1 = "Asd";
    char* s2 = "asd";
    if (strcmp(s1, s2) == 0)
    {
        printf("s1 = s2\n");
    }
    else
    {
        printf("%d\n", strcmp(s1, s2));
    }
    system("pause");
    return 0;
}

5.strcpy

复制字符串

#pragma warning(disable:4996)
#include<stdio.h>
#include<string.h>
#include <stdlib.h>
int main()
{
    char s1[] = "Asd";
    char *s2 = (char *)malloc(strlen(s1) + 1);
    strncpy(s2, s1,4);//安全一些只能拷贝strlen(s1) + 1个字符
    printf("s2 = %s",s2);
    system("pause");
    return 0;
}

6.strchr/strsht

char s1[] = "hello";
char *p = strchr(s1,'l');
输出
"llo"