函数说明 strcasecmp()用来比较参数s1和s2字符串,比较时会自动忽略大小写的差异。
返回值 若参数s1和s2字符串相同则返回0。s1长度大于s2长度则返回大于0 的值,s1 长度若小于s2 长度则返回小于0的值.
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- #include
- #include
- #include
- int strcasecmp(const char *s1, const char *s2)
- {
- int c1, c2;
- do {
- c1 = tolower(*s1 );
- c2 = tolower(*s2 );
- } while(c1 == c2 && c1 != 0);
- return c1 - c2;
- }
- int main(void)
- {
- int n = 4;
- char str1[] = "acef";
- char str2[] = "acefd";
- printf("strcasecmp(str1, str2) = %d/n", strcasecmp(str1, str2));
- return 0;
- }
函数说明:strncasecmp()用来比较参数s1和s2字符串前n个字符,比较时会自动忽略大小写的差异
返回值 :若参数s1和s2字符串相同则返回0 s1若大于s2则返回大于0的值 s1若小于s2则返回小于0的值
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- #include
- #include
- #include
- int mystrncasecmp(const char *s1, const char *s2, int n)
- {
- int c1, c2;
- do {
- c1 = tolower(*s1 );
- c2 = tolower(*s2 );
- } while((--n > 0) && c1 == c2 && c1 != 0);
- return c1 - c2;
- }
- int main(void)
- {
- int n = 4;
- char str3[] = "abcf";
- char str4[] = "abcd";
- printf("mystrncasecmp(str3, str4, n) = %d/n", mystrncasecmp(str3, str4, n));
- return 0;
- }