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/*把高于平均分的学生数据放在b所指的数组中，高于等于平均分的学生人数通过形参n传回，平均分通过函数值返回．*/
#include <stdio.h>
#define N 12
typedef struct
{ char num[10];
double s;
} STREC;
double fun (STREC *a,STREC *b, int *n)
{int i;
double av=0.0;
*n=0;
for (i=0;i<N;i++)
av=av+a[i].s;
av=av/n;
for(i=0;i<N;i++)
if (av<=a[i].s)
{b[*n]=a[i];*n=*n+1;}
return av;
}
main()
{
STREC s[N]={{"GA05",85},{"GA03",76},{"GA02",69},{"GA04",85},
{"GA01",91},{"GA07",72},{"GA08",64},{"GA06",87},
{"GA09",60},{"GA11",79},{"GA12",73},{"GA10",90}};
STREC h[N],t;
FILE *out;
int i,j,n;
double ave;
ave=fun(s,h,&n);
printf("The %d student data which is higher than %7.3f:\n",n,ave);
for(i=0;i<n;i++)
printf("%s %4.1f\n",h[i].num,h[i].s);
printf("\n");
out=fopen("out90.dat","w");
fprintf(out,"%d\n %7.3f\n",n,ave);
for(i=0;i<n-1;i++)
for(j=i+1;j<n;j++)
if(h[i].as<h[j].s)
{t=h[i];h[i]=h[j];h[j]=t;} /*分数从高到低排列*/
for(i=0;i<n;i++)
fprintf(out,"%4.1f\n",h[i].s);
fclose (out);
} |
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