2005-c-一-2

#include <stdio.h>

int main()
{
    char *s="121";
    int k=0,a=0,b=0;
    do{
        k++;
        if(k%2==0){a=a+s[k]-'0';continue;}
        b=b+s[k]-'0';a=a+s[k]-'0';
    }while(s[k+1]);
 printf("k=%d,a=%d,b=%d",k,a,b);
}