文字列関数strcmp
2965 ワード
/*
* :int strcmp(const char *s1,const char * s2);
* :#include <string.h>
* : s1 s2。
* :
* s1<s2 , <0
* s1=s2 , =0
* s1>s2 , >0
* strcmp
*/
#include <cstdio>
#include <cassert>
int _strcmp(const char * s,const char * t)
{
assert((s != NULL)&&(t != NULL));
while(*s && *t && *s==*t)
{
s++;
t++;
}
return *s-*t;
}
int main()
{
char str1[] = "apPle";
char *str2 = "apple";
int flag = _strcmp(str1,str2);
if(flag < 0) printf("%s is less than %s
",str1,str2);
else if(flag == 0) printf("%s is equal %s
",str1,str2);
else printf("%s is larger than %s
",str1,str2);
getchar();
return 0;
}