版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/jiang1986829/article/details/48545761
函数名:strcat
功能:字符串拼接
函数定义:char *strcat( char *to, const char *from);
char fullpath[1024], * filename = "logfile.txt";
strcpy(fullpath, "c:\\tmp");
strcat(fullpath, "\\");
strcat(fullpath, filename);
lr_output_message ("Full path of file is %s", fullpath);
Output:
Action.c(9): Full path of file is c:\tmp\logfile.txt
函数名:strcmp
功能:两个字符串比较
函数定义:int strcmp( const char *string1, const char *string2);
int result;
char tmp[20];
char string1[] = "The quick brown dog jumps over the lazy fox";
char string2[] = "The QUICK brown dog jumps over the lazy fox";
result = strcmp( string1, string2); // Case-sensitive comparison
if(result > 0)
strcpy(tmp, "greater than");
else if(result < 0)
strcpy(tmp, "less than");
else
strcpy(tmp, "equal to");
lr_output_message ("strcmp: String 1 is %s string 2", tmp);
result = stricmp(string1, string2 ); // Case-insensitive comparison
if( result > 0 )
strcpy( tmp, "greater than" );
else if( result < 0 )
strcpy( tmp, "less than" );
else
strcpy( tmp, "equal to" );
lr_output_message( "stricmp: String 1 is %s string 2", tmp );
Output:
Action.c(17): strcmp: String 1 is greater than string 2
Action.c(28): stricmp: String 1 is equal to string 2
返回值 | 描述 |
<0 | string1 小于string2 |
0 | string1 等于string2 |
>0 | string1 大于string2 |
函数名:strcpy
功能:将一个字符串复制到另一个字符串
函数定义:char *strcpy( char *dest, const char *source);
char fullpath[1024], * filename = "logfile.txt";
strcpy(fullpath, "c:\\tmp");
lr_output_message ("fullpath after strcpy: %s", fullpath);
strcat(fullpath, "\\");
strcat(fullpath, filename);
lr_output_message ("Full path of file is %s", fullpath);}
Output:
Action.c(6): fullpath after strcpy: c:\tmp
Action.c(10): Full path of file is c:\tmp\logfile.txt
函数名:strlen
功能:返回指定字符串的长度
函数定义:size_t strlen( const char *string );
int is_digit, i = 0;
char * str = "1234567k89";
unsigned int len = strlen(str);
do {
if (i == len) {
lr_output_message ("No letters found in string");
return -1;
}
is_digit = isdigit(str[i++]);
} while (is_digit);
lr_output_message ("The first letter appears in character %d of string", i);}
Output:
Action.c(18): The first letter appears in character 8 of string<strong>
</strong>