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#include stdio.hstruct stud
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{
int num;
char name[20];
float score1, score2, score3, aver;
}; int main(void)
{
int high;
int i, j;
struct stud myClass[10], *pStu = myClass;
struct stud temp; printf("Please input students info:Num Name score1 score2 score3\n");
for (i = 0; i 10; i++)
{
printf("%d:", i + 1);
scanf("%d %s %f %f %f", myClass[i].num, myClass[i].name, myClass[i].score1,
myClass[i].score2, myClass[i].score3);
myClass[i].aver = (myClass[i].score1 + myClass[i].score2 + myClass[i].score3) / 3;
} high = 0;
for (i = 0; i 10; i++)
{
if (myClass[i].aver myClass[high].aver)
{
high = i;
}
} printf("\nThe Highest is %s(%d)\nscore1=%.2f score2=%.2f score3=%.2f aver=%.2f\n",
myClass[high].name, myClass[high].num,
myClass[high].score1, myClass[high].score2, myClass[high].score3, myClass[high].aver); for (i = 0; i 9; i++)
{
for (j = i + 1; j 10; j++)
{
if ((pStu + j)-aver (pStu + i)-aver)
{
temp = *(pStu + j);
*(pStu + j) = *(pStu + i);
*(pStu + i) = temp;
}
}
} printf("\nResult of sort:\n");
printf("Num Name score1 score2 score3 average\n");
for (i=0; i10; i++)
{
printf("%-5d %-20s %-8.2f %-8.2f %-8.2f %-.2f\n", (pStu+i)-num, (pStu+i)-name,
(pStu+i)-score1, (pStu+i)-score2, (pStu+i)-score3, (pStu+i)-aver);
}
return 0;
}
#include stdio.h
int main()
{
float score[2][2] = {0};
for (int i = 0; i 2; i++)
{
for (int j = 0; j 2; j++)
{
scanf("%f", score[i][j]);
}
}
printf("----------------------\n");
printf("序号语文 数学 总成绩\n");
printf("----------------------\n");
for (int i = 0; i 2; i++)
{
printf("%-4d%-6.1f%-6.1f%6.1f\n", i + 1, score[i][0], score[i][1], score[i][0] + score[i][1]);
}
return 0;
}
//测试输出：
//80.0
//90.5
//90.5
//70.5
//----------------------
//序号语文 数学 总成绩
//----------------------
//1 80.0 90.5 170.5
//2 90.5 70.5 161.0
#includestdio.h
#includestdlib.h
#includestring.h
typedef struct
{
char id[15];
char name[10];
int score;
} StudentInfo;
typedef struct
{
StudentInfo arr[100];
int length;
} SeqList;
FILE *fp;
char *filePath = "C:/StudentInfo.txt";
void initSeqList(SeqList *L)
{
L-length = 0;
}
void insertSeqList(SeqList *L, int i, StudentInfo info)å
{
int j;
for(j = L-length; j i; j--)
L-arr[j] = L-arr[j-1];
L-arr[j] = info;
L-length++;
}
void printStudentInfo(StudentInfo info)
{
printf("%s\t%s\t%d\n", info.id, info.name, info.score);
}
void printSeqListWithSeqNo(SeqList L)
{
for(int i = 0; i L.length; i++)
{
printf("%d\t", i+1);
printStudentInfo(L.arr[i]);
}
}
void printSeqList(SeqList L)
{
for(int i = 0; i L.length; i++)
printStudentInfo(L.arr[i]);
}
int queryInfoById(SeqList L, char *id)
{
for(int i = 0; i L.length; i++)
if(strcmp(id, L.arr[i].id)==0)
return i;
return -1;
}
int queryInfoByName(SeqList L, char *name)
{
for(int i = 0; i L.length; i++)
if(strcmp(name, L.arr[i].name)==0)
return i;
return -1;
}
void save2File(SeqList L)
{
fp = fopen(filePath, "w");
for (int i = 0; i L.length; i++)
fprintf(fp, "%s\t%s\t%d\n", L.arr[i].id, L.arr[i].name, L.arr[i].score);
}
void showMenu(SeqList L);
void addInfo(SeqList L)
{
StudentInfo info;
int index;
do {
printf("请输入学号：");
scanf("%s", info.id);
index = queryInfoById(L, info.id);
if (index != -1)
{
printf("输入的学号已存在。\n");
printStudentInfo(L.arr[index]);
}
} while(index != -1);
do {
printf("请输入姓名：");
scanf("%s", info.name);
index = queryInfoByName(L, info.name);
if(index != -1)
{
printf("输入的姓名已存在。\n");
printStudentInfo(L.arr[index]);
}
} while(index != -1);
printf("请输入成绩：");
scanf("%d", info.score);
L.arr[L.length] = info;
L.length++;
save2File(L);
}
void editInfo(SeqList L)
{
StudentInfo info;
char choice;
printf("1. 按学号修改\n2. 按姓名修改\n3. 返回上一层\n");
while((choice=getchar())=='\n');
int index;
if(choice == '1' || choice == '2')
{
if(choice == '1')
{
printf("请输入学号：");
scanf("%s", info.id);
index = queryInfoById(L, info.id);
} else {
printf("请输入姓名：");
scanf("%s", info.name);
index = queryInfoByName(L, info.name);
}
if(index != -1)
printStudentInfo(L.arr[index]);
else {
printf("%s 为 %s 的学生不存在\n", choice==1?"学号":"姓名", choice==1?info.id:info.name);
editInfo(L);
return;
}
printf("成绩改为：");
scanf("%d", L.arr[index].score);
save2File(L);
}else if(choice == '3')
showMenu(L);
else {
printf("选择有误，请重新选择\n");
editInfo(L);
return;
}
}
void insertSort(SeqList *L)
{
for(int j = 1; j L-length; j++)
{
StudentInfo key = L-arr[j];
int i = j - 1;
while(i = 0 L-arr[i].score key.score)
{
L-arr[i+1] = L-arr[i];
i--;
}
L-arr[i+1] = key;
}
}
void statisticInfo(SeqList L)
{
// 显示 60 分以下、60～79、80～89、90 分以上各分数段的学生信息
SeqList sectionListArr[4];
for (int i = 0; i 4; i++)
initSeqList(sectionListArr[i]);
float sum = 0, average, passedRate;
for (int i = 0; i L.length; i++)
{
int score = L.arr[i].score;
sum += score;
if(score 60)
insertSeqList(sectionListArr[0], sectionListArr[0].length, L.arr[i]);
else if(score = 60 score 80)
insertSeqList(sectionListArr[1], sectionListArr[1].length, L.arr[i]);
else if(score = 80 score 90)
insertSeqList(sectionListArr[2], sectionListArr[2].length, L.arr[i]);
else insertSeqList(sectionListArr[3], sectionListArr[3].length, L.arr[i]);
}
average = sum/L.length;
passedRate = (L.length-sectionListArr[0].length)*100.0/L.length;
insertSort(L);
printf("60 分以下的学生：\n");
printSeqList(sectionListArr[0]);
printf("\n60 ~ 79 分的学生：\n");
printSeqList(sectionListArr[1]);
printf("\n80 ~ 89 分的学生：\n");
printSeqList(sectionListArr[2]);
printf("\n90 分以上的学生：\n");
printSeqList(sectionListArr[3]);
printf("\n及格率：%.1f %%\n平均分：%.1f\n", passedRate, average);
printf("按顺序从高到低排序：\n");
insertSort(L);
printSeqListWithSeqNo(L);
printf("\n最高分：\n");
printStudentInfo(L.arr[0]);
printf("\n最低分：\n");
printStudentInfo(L.arr[L.length-1]);
}
void queryInfo(SeqList L)
{
char choice;
printf("1. 按学号查询\n2. 按姓名查询\n3. 返回上层\n");
while((choice=getchar())=='\n');
int index;
if (choice == '1')
{
char id[15];
printf("请输入学号：");
scanf("%s", id);
index = queryInfoById(L, id);
} else if(choice == '2') {
char name[10];
printf("请输入姓名：");
scanf("%s", name);
index = queryInfoByName(L,name);
} else if(choice == '3') {
showMenu(L);
return;
} else {
printf("选择有误，请重新选择\n");
queryInfo(L);
return;
}
if(index == -1)
printf("没有查询到结果\n");
else
printStudentInfo(L.arr[index]);
}
void showMenu(SeqList L)
{
char choice;
printf("\n1. 查询\n2. 添加成绩\n3. 修改成绩\n4. 统计分析\n5. 退出\n");
while((choice = getchar()) == '\n');
switch(choice)
{
case '1': queryInfo(L); break;
case '2': addInfo(L); break;
case '3': editInfo(L); break;
case '4': statisticInfo(L); break;
case '5': exit(0);
}
}
int main(void)
{
StudentInfo temp;
SeqList *L = (SeqList*)malloc(sizeof(SeqList));
do {
initSeqList(L);
fp = fopen(filePath, "r");
int i = 0;
while(fscanf(fp, "%s%s%d", temp.id, temp.name, temp.score) != EOF)
insertSeqList(L, i++, temp);
showMenu(*L);
fclose(fp);
}while(1);
return 0;
}
#include stdio.h
#define N 100
/*定义学生结构体*/
struct Student
{
int ID;
char Name[20];
float Mark1;
float Mark2;
float Mark3;
float Sum;
};
/*声明学生数组及学生数量*/
struct Student students[N];
//int num=0;
/*求总分*/
float Sums(struct Student stu)
{
return stu.Mark1+stu.Mark2+stu.Mark3;
}
/*输入学生信息*/
int Student_Input(){
int num=0;
while(1){
//printf("请输入学号:");
students[num].ID=num+1; //可以自行将学号改为手工输入
printf("请输入姓名:");
scanf("%s",students[num].Name);
getchar();
printf("请输入成绩1:");
scanf("%f",students[num].Mark1);
getchar();
printf("请输入成绩2:");
scanf("%f",students[num].Mark2);
printf("请输入成绩3:");
scanf("%f",students[num].Mark3);
getchar();
students[num].Sum=Sums(students[num]);
num++;
printf("是否继续?(y/n)"); //继续输入数据？
if (getchar()=='n'){
break;
}
}
return num;
}
/*输出学生信息*/
void Student_Display(int n)
{
int i;
printf("%10s%10s%8s%8s%8s%8s\n","学号","姓名","成绩","成绩","成绩","总成线");
printf("---------------------------------------------------------\n");
for (i=0;in;i++)
{
printf("%10d%10s%8.2f%8.2f%8.2f%8.2f\n",students[i].ID,students[i].Name,
students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Sum);
}
}
/*主程序*/
int main(){
int n=0;
n=Student_Input();
Student_Display(n);
return 0;
}