#include <stdio.h>
#pragma warning (disable:4996)
void fun (long s, long t)
{ long sl = 10;
s %= 10;
t = s / 10; //取第一个数
while(s > 0) {
s = s / 100; //跳过偶数位上的数字
/**found**/
t = s % 10 sl + t; //将其“粘”在一起
/**found**/
sl *= 10; //表示下一位基数
}
}

main()
{ long s, t;
printf("\nPlease enter long number:");
scanf("%ld", &s); fun(s, &t);
printf("The result is: %ld\n", t);
}