for(i=0;i<NUM;i++)
sprintf(&ch,"%20.20s%5.5s%5.5s%5.5s%5.5s%5.5s",man[i].name,man[i].score1,man[i].score2,man[i].score3,man[i].score4,man[i].score5);


warning: passing arg 1 of `sprintf' from incompatible pointer type


矛盾的指针类型，定义的都是char型啊

"%20.20s%5.5s%5.5s%5.5s%5.5s%5.5s"  这些是什么东西

%s
%d
%u
%f
...
...
...

你把整个程序发上来吧，这样看不出来撒

你定义的ch是什么东东。

#include "stdio.h"
#define NUM 1
#define L 100
struct mem
{
    char name[20];
    char score1[5];
    char score2[5];
    char score3[5];
    char score4[5];
    char score5[5];
}man[NUM];
main()
{
    int i;
    char ch[NUM];
    for(i=0;i<NUM;i++)
     {
      printf("input name:\n");
      scanf("%s",man[i].name);
      printf("input score:\n");
      scanf("%s",man[i].score1);
      printf("input score:\n");
      scanf("%s",man[i].score2);
      printf("input score:\n");
      scanf("%s",man[i].score3);
      printf("input score:\n");
      scanf("%s",man[i].score4);
      printf("input score:\n");
      scanf("%s",man[i].score5);
     }
    printf("name\tscore1\tscore2\tscore3\tscore4\tscore5\n\n");
    for(i=0;i<NUM;i++)
    printf("%s\t%s\t%s\t%s\t%s\t%s\n",man[i].name,man[i].score1,man[i].score2,man[i].score3,man[i].score4,man[i].score5);

for(i=0;i<NUM;i++)
sprintf(&ch,"%20.20s%5.5s%5.5s%5.5s%5.5s%5.5s",man[i].name,man[i].score1,man[i].score2,man[i].score3,man[i].score4,man[i].score5);

sprintf(ch,"%20.20s%5.5s%5.5s%5.5s%5.5s%5.5s",man[i].name,man[i].score1,man[i].score2,man[i].score3,man[i].score4,man[i].score5);

ch前面不要&符号

编译可以过去了
不过在输出的时候会报段错误

ch本来就是个地址了（指针常量）

#include "stdio.h"
#define NUM 3
#define L 100
struct mem
{
    char name[20];
    char score1[5];
    char score2[5];
    char score3[5];
    char score4[5];
    char score5[5];
}man[NUM];
main()
{
    int i;
    char ch;
    FILE *fp;
    for(i=0;i<NUM;i++)
     {
      printf("input name:\n");
      scanf("%s",man[i].name);
      printf("input score:\n");
      scanf("%s",man[i].score1);
      printf("input score:\n");
      scanf("%s",man[i].score2);
      printf("input score:\n");
      scanf("%s",man[i].score3);
      printf("input score:\n");
      scanf("%s",man[i].score4);
      printf("input score:\n");
      scanf("%s",man[i].score5);
     }
    printf("name\tscore1\tscore2\tscore3\tscore4\tscore5\n\n");
    for(i=0;i<NUM;i++)
   {
 printf("%s\t%s\t%s\t%s\t%s\t%s\n",man[i].name,man[i].score1,man[i].score2,man[i].score3,man[i].score4,man[i].score5);
}
for(i=0;i<NUM;i++)
{
sprintf(ch,"%-20.20s%5.5s%5.5s%5.5s%5.5s%5.5s",man[i].name,man[i].score1,man[i].score2,man[i].score3,man[i].score4,man[i].score5);
}
        fp = fopen("/home/wanwj/sdve/testc.txt","w");
        if(!fp)
        {
                printf("测试文件/home/wanwj/sdve/testc.txt打开错误!");
                return;
        }
        fputs( ch, fp );
        fclose(fp);
}