编写一个程序，判断输入的一个字符串是否是回文。若是，则输出YES，否则，输出No

Question

如题所述

Answer 1

#include <stdio.h>
#include <stdlib.h>
int main()
{char input[100] = {0};
int str_bound = 0; int i, res_ok = 1; printf("Enter a string.\n");
scanf("%s", input);
str_bound = strlen(input) -1; for (i = 0; i <= str_bound/2; i++) {
if (*(input + i) != *(input + str_bound -i)) { res_ok = 0;
break;
} }
if(res_ok) printf("YES\n");
else
printf("NO\n"); return 0;
}

Answer 2

#include <stdio.h>#include <string.h>void main()
{ char s[256]; gets(s); int i,len=strlen(s); int flag=1; for(i=0;i<len/2;i++) if(s[i]!=s[len-1-i]) {flag=0; break;} if(flag==1) prnitf("YES\n"); else printf("NO\n");
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