C语言
/*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
typedefstruct
{ char num;
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.s;
av=av/n;
for(i=0;i<N;i++)
if (av<=a.s)
{b[*n]=a;*n=*n+1;}
return av;
}
main()
{
STRECs={{"GA05",85},{"GA03",76},{"GA02",69},{"GA04",85},
{"GA01",91},{"GA07",72},{"GA08",64},{"GA06",87},
{"GA09",60},{"GA11",79},{"GA12",73},{"GA10",90}};
STRECh,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.num,h.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.as<h.s)
{t=h;h=h;h=t;} /*分数从高到低排列*/
for(i=0;i<n;i++)
fprintf(out,"%4.1f\n",h.s);
fclose (out);
} c 语言
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