#include
#include
#pragma pack(1)
typedef struct student{
char stuNo[10];
char name[20];
float score;
}STU_INFO;
#pragma pack()
//函数原型声明
void print_best_score(STU_INFO *stu,int n,FILE *fp);
void print_score_number(STU_INFO *stu,int n,FILE *fp);
void print_score_level(STU_INFO *stu,int n,FILE *fp);
int main()
{
FILE *fp_in,*fp_out;
int i,count;
char buff[64];
STU_INFO *stu;
if((fp_in=fopen("stuin.txt","r")) == NULL){
printf("Open file Error!\n");
exit(-1);
}
if((fp_out=fopen("stuout.txt","w")) == NULL){
printf("Open file Error!\n");
exit(-1);
}
//获取学生信息的数量,即有多少行数据信息
count=0;
while(fgets(buff,sizeof(buff),fp_in) != NULL){
count++;
}
//将文件指针重新定位到文件头
rewind(fp_in);
//动态内存分配
stu=(STU_INFO*)malloc(sizeof(STU_INFO)*count);
//将文本文件的内容读入到结构体数组中
i=0;
while(!feof(fp_in)){
fscanf(fp_in,"%s%s%f",stu[i].stuNo,stu[i].name,&stu[i].score);
i++;
}
//显示成绩最高的人的学号、姓名和成绩（如果有相同的人要全部显示）
printf("显示成绩最高的人的学号、姓名和成绩如下:\n");
print_best_score(stu,count,fp_out);
//显示平均成绩、高于、低于和等于平均成绩的人数
printf("\n显示平均成绩、高于、低于和等于平均成绩的人数:\n");
print_score_number(stu,count,fp_out);
//显示成绩等级
printf("显示成绩为优秀(90～100)、良好(80～89)、中等(70～79)、及格(60～69)、不及格(0～59)的人数和所占百分比:\n");
print_score_level(stu,count,fp_out);
//释放动态分配的内存空间并关闭文件
free(stu);
fclose(fp_in);
fclose(fp_out);
return 0;
}
void print_best_score(STU_INFO *stu,int n,FILE *fp)
{
float best;
int i;
best=stu[0].score;
//先得到成绩最高分数
for(i=1;i if(stu[i].score > best){
best=stu[i].score;
}
}
for(i=0;i if(stu[i].score == best){
printf("%s %s %.2f\n",stu[i].stuNo,stu[i].name,stu[i].score);
//同时将显示结果保存到文件中
fprintf(fp,"%s %s %.2f\n",stu[i].stuNo,stu[i].name,stu[i].score);
}
}
void print_score_number(STU_INFO *stu,int n,FILE *fp)
{
int i,ave_count,higher_count,lower_count;
float sum,ave;
for(i=0,sum=0;i sum+=stu[i].score;
ave=sum/n;
printf("average score: %.2f\n",ave);
//将平均成绩写入到文件
fprintf(fp,"\naverage score: %.2f\n",ave);
ave_count=higher_count=lower_count=0;
for(i=0;i if(stu[i].score < ave)
lower_count++;
else if(stu[i].score == ave)
ave_count++;
else
higher_count++;
}
printf("higher_count: %d\n",higher_count);
fprintf(fp,"higher_count: %d\n",higher_count);
printf("lower_count: %d\n",lower_count);
fprintf(fp,"lower_count: %d\n",lower_count);
printf("ave_count: %d\n\n",ave_count);
fprintf(fp,"ave_count: %d\n\n",ave_count);
}
void print_score_level(STU_INFO *stu,int n,FILE *fp)
{
int i,excellent_count,good_count,mid_count,pass_count,fail_count;
float excellent_per,good_per,mid_per,pass_per,fail_per;
excellent_count=good_count=mid_count=pass_count=fail_count=0;
for(i=0;i if(stu[i].score>=90 && stu[i].score<=100)
excellent_count++;
else if(stu[i].score>=80 && stu[i].score<90)
good_count++;
else if(stu[i].score>=70 && stu[i].score<80)
mid_count++;
else if(stu[i].score>60 && stu[i].score<70)
pass_count++;
else
fail_count++;
}
excellent_per=(1.0*excellent_count/n)*100;
good_per=(1.0*good_count/n)*100;
mid_per=(1.0*mid_count/n)*100;
pass_per=(1.0*pass_count/n)*100;
fail_per=(1.0*fail_count/n)*100;
printf("excellent_student: %d %.2f%%\n",excellent_count,excellent_per);
printf("good student: %d %.2f%%\n",good_count,good_per);
printf("mid_student: %d %.2f%%\n",mid_count,mid_per);
printf("pass_student: %d %.2f%%\n",pass_count,pass_per);
printf("fail_student: %d %.2f%%\n",fail_count,fail_per);
//写入文件
fprintf(fp,"excellent_student: %d %.2f%%\n",excellent_count,excellent_per);
fprintf(fp,"good student: %d %.2f%%\n",good_count,good_per);
fprintf(fp,"mid_student: %d %.2f%%\n",mid_count,mid_per);
fprintf(fp,"pass_student: %d %.2f%%\n",pass_count,pass_per);
fprintf(fp,"fail_student: %d %.2f%%\n",fail_count,fail_per);
}
//stuin.txt文件内容如下:
1001 stuname1 89
1002 stuname2 78
1003 stuname3 60
1004 stuname4 59
1005 stuname5 96
1006 stuname6 93
1007 stuname7 48
1008 stuname8 86
1009 stuname9 76
1010 stuname10 64
1011 stuname11 72
1012 stuname12 77
1013 stuname13 81
1014 stuname14 66
1015 stuname15 83
1016 stuname16 65
1017 stuname17 96
1018 stuname18 62
运行结果截图如下：
//stuout.txt文件内容如下：
1005 stuname5 96.00
1017 stuname17 96.00
average score: 75.06
higher_count: 10
lower_count: 8
ave_count: 0
excellent_student: 3 16.67%
good student: 4 22.22%
mid_student: 4 22.22%
pass_student: 4 22.22%
fail_student: 3 16.67%
