判断回文

#include<stdio.h>
int main(){
int i,k;
char line[80];
printf("Enter a string:");
k=0;
while((line[k]=getchar())!='\n'){
k++;
}
line[k]='\0';

i=0;
k=k-1;
while(i<k){
if(line[i]!=line[k]) break;
i++;
k--;
}
if(i>=k) printf("It is a palindrome\n");
else printf("It is not a palindrome\n");
return 0;
}