main()
{
     struct stu
     {
            int num;
            char *name;
            char sex;
            float score;
     };
     struct stu boy1,boy2;
     boy1.num=102;
     boy1.name="zhany ping";
     printf("input sex and score\n");
     scanf("%c %f",&boy1.sex,&boy1.score);
     boy2=boy1;
     printf("number=%d\nname=%s\n",boy2.num,boy2.name);
     printf("%sex=%c\nscore=%f\n",boy2.sex,boy2.score);
}

printf(" % sex=%c\nscore=%f\n",boy2.sex,boy2.score);

boy2=boy1  额 这个不对吧，试试用memcpy函数

利害..%是這個問題

#include <stdio.h>
main()
{
     struct stu
     {
            int num;
            char *name;
            char sex;
            float score;
     }; 
     struct stu boy1,boy2;
     boy1.num=102;
     boy1.name="zhany ping";
     printf("input sex and score\n");
     scanf("%c %f",&boy1.sex,&boy1.score);
     boy2=boy1;
     printf("number=%d\nname=%s\n",boy2.num,boy2.name);
     printf("sex=%c\nscore=%f\n",boy2.sex,boy2.score);//去掉sex前的% 
}

%怎么加到sex前了.楼上正解

printf("%sex=%c\nscore=%f\n",boy2.sex,boy2.score); 多了个% printf 傻了