目录
后记：●由于作者水平有限，文章难免存在谬误之处，敬请读者斧正，俚语成篇，恳望指教！ ——By 作者：新晓·故知
本章重点
1. 函数介绍
1.1 strlen
注：
#include <stdio.h>
int main()
{
const char* str1 = "abcdef";
const char* str2 = "bbb";
if (strlen(str2) - strlen(str1) > 0)
{
printf("str2>str1\n");
}
else
{
printf("srt1>str2\n");
}
return 0;
}1.2 strcpy
1.3 strcat
1.4 strcmp
1.5 strncpy
1.6 strncat
/* strncat example */
#include <stdio.h>
#include <string.h>
int main()
{
char str1[20];
char str2[20];
strcpy(str1, "To be ");
strcpy(str2, "or not to be");
strncat(str1, str2, 6);
puts(str1);
return 0;
}1.7 strncmp
比较到出现另个字符不一样或者一个字符串结束或者num个字符全部比较完
/* strncmp example */
#include <stdio.h>
#include <string.h>
int main()
{
char str[][5] = { "R2D2" , "C3PO" , "R2A6" };
int n;
puts("Looking for R2 astromech droids...");
for (n = 0; n < 3; n++)
if (strncmp(str[n], "R2xx", 2) == 0)
{
printf("found %s\n", str[n]);
}
return 0;
}1.8 strstr
Returns a pointer to the first occurrence of str2 in str1, or a null pointer if str2 is not part of str1.
/* strstr example */
#include <stdio.h>
#include <string.h>
int main()
{
char str[] = "This is a simple string";
char* pch;
pch = strstr(str, "simple");
strncpy(pch, "sample", 6);
puts(str);
return 0;
}
