C语言编程？

#include

#include

int main()

{

int i,result;

char s1[15],s2[10];

printf("please input string1:\n");

gets(s1);

printf("please input string2:\n");

gets(s2);

i=0;

while(s1[i]==s2[i]&&s1!='\0') i++;//当s1、s2相同字符时且s1！='\0'时进入循环

if(s1[i]=='\0'&&s2=='\0')//s1、s2所有字符比较完毕都相等

result = 0;

else

result =s1[i]-s2[i];//s1、s2某个字符不相等，输出结果

printf("The result of comparing two strings is %d\n",result);

return 0;

}

#include

int strcompare(char *p1,char *p2)

{

int i;

for(i=0;p1[i]!='\0'&&p2[i]!='\0';i++)

if(p1[i]!=p2[i])//两个字符串长度相同时，其中某个字符不同

return (p1[i]-p2[i]);

if(p1[i]=='\0'&&p2[i]=='\0')//两个字符串长度相同时且所有字符相同

return 0;

else

return (p1[i]-p2[i]);//两个字符串长度不相等且某个字符不同

}

int main()

{

char s1[15],s2[10];

printf("please input string1:\n");

gets(s1);

printf("please input string2:\n");

gets(s2);

printf("The result of comparing two strings is %d\n",strcompare(s1,s2));

return 0;

}