这个比较简单

[Martin丶]

#include<stdio.h>
#define n 10
void menu();
int inputScore(int s[],int length);
void outputScore(int s[],int length);
int queryScore(int score[],int length,int xScore);
int aversum(int score[],int length);
int main()
{
int score[n],avers = 0;
int cha = 0,chengji = 0,find,x;
int choice;

while(1)
{
fflush(stdin);
menu();
printf("请选择1.2.3.4.5\n");
choice = getchar();
switch(choice)
{
case '1':
chengji = inputScore(score,n);
break;
case '2':
outputScore(score,chengji);
break;
case '3':
printf("请输入要查找的成绩:");
scanf("%d",&x);
find = queryScore(score,chengji,x);
if (find >= 0)
printf("%d\n",find);
else printf("对不起没有\n");
break;
case '4':
avers = aversum(score,n);
printf("%d\n",avers);
break;
case '5':
exit(0);break;
default:printf("输入错误!\n");break;
}
}
return 0;
}
void menu()
{
printf("****************************************\n");
printf("* 学生成绩管理系统 *\n");
printf("* *\n");
printf("* 1.录用 *\n");
printf("* 2.输出 *\n");
printf("* 3.查询 *\n");
printf("* 4.排序 *\n");
printf("* 5.结束 *\n");
printf("* *\n");
printf("****************************************\n");
}
int inputScore(int score[],int length)
{
int i = 0;
int tmp;
printf("请输入学生的成绩（以-1结束输入):\n");
for(i = 0;tmp != -1 && i < length;i++)
{
printf("第%d个学生：",i+1);
scanf("%d",&tmp);
if(tmp >= 0&&tmp <= 100)
{
score[i] = tmp;
}
}
return i;
}
void outputScore(int score[],int length)
{
int i=0;

printf("学生成绩如下：\n");
for(i=0;i<length;i++)
printf("%d %-3d\n",i+1,score[i]);
printf("\n");
}
int queryScore(int score[],int length,int xScore)
{
int i;

for(i = 0;i < length;i++)
{
if(xScore == score[i])
{
return i;
}
}
return -1;
}
int aversum(int score[],int length)
{
int i;
int sum = 0,chengji = 0;
int aversum = 0;
for(i = 0,zongshu = 0;i < length;i++,zongshu++)
{
sum += score[i];
}
return sum / length;
}


怎么算的平均数不对...

[zhaghi]

return sum / length;
这个是会取整而已，后面小数部分丢掉了。

[無_1024]

#include <stdio.h>

void Itob(int n,char s[],int b);

int main()
{
	int n,b;
	char s[20];
	scanf("%d %d",&n,&b);
	Itob(n,s,b);
	return 0;
}

void Itob(int n,char s[20],int b)
{
	int i,j;
	i=0;
	j=0;
	char a;
	int c;
	while( n != 0 )
	{
		c= n % b;
		(c < 10)?(s[i]= c+'0'):(s[i]=c+'A');
		n = n / b;
		i++;
	}
	s[i]= '\0';
	i--;

	while(i >= j)
	{
		a=s[i];
		s[i]=s[j];
		s[j]=a;
		i--;
		j++;
	}
	printf("%s\n",s);
}

[無_1024]

回复错了

[無_1024]

#include <stdio.h>
#include <stdlib.h>
#define n 10
void menu();
int inputScore(int s[],int length);
void outputScore(int s[],int length);
int queryScore(int score[],int length,int xScore);
double aversum(int score[],int length);
int main()
{
	int score[n];
	double avers = 0;
	int cha = 0,chengji = 0,find,x;
	int choice;
	
	while(1)
	{
		fflush(stdin);
		menu();
		printf("请选择1.2.3.4.5\n");
		choice = getchar();
		switch(choice)
		{
		case '1':
			chengji = inputScore(score,n);
			break;
		case '2':
			outputScore(score,chengji);
			break;
		case '3':
			printf("请输入要查找的成绩:");
			scanf("%d",&x);
			find = queryScore(score,chengji,x);
			if (find >= 0)
				printf("%d\n",find);
			else 
				printf("对不起没有\n");
			break;
		case '4':
			avers = aversum(score,chengji);
			printf("%d\n",avers);
			break;
		case '5':
			exit(0);break;
		default:printf("输入错误!\n");break;
		}
	}
	return 0;
}
void menu()
{
	printf("****************************************\n");
	printf("* 学生成绩管理系统 *\n");
	printf("* *\n");
	printf("* 1.录用 *\n");
	printf("* 2.输出 *\n");
	printf("* 3.查询 *\n");
	printf("* 4.排序 *\n");
	printf("* 5.结束 *\n");
	printf("* *\n");
	printf("****************************************\n");
}
int inputScore(int score[],int length)
{
	int i = 0;
	int tmp;
	printf("请输入学生的成绩（以-1结束输入):\n");
	for(i = 0;tmp != -1 && i < length;i++)
	{
		printf("第%d个学生：",i+1);
		scanf("%d",&tmp);
		if(tmp >= 0&&tmp <= 100)
		{
			score[i] = tmp;
		}
	}
	return i-1;//----
}
void outputScore(int score[],int length)
{
	int i=0;
	
	printf("学生成绩如下：\n");
	for(i=0;i<length;i++)
		printf("%d %-3d\n",i+1,score[i]);
	printf("\n");
}
int queryScore(int score[],int length,int xScore)
{
	int i;
	
	for(i = 0;i < length;i++)
	{
		if(xScore == score[i])
		{
			return i;
		}
	}
	return -1;
}
double aversum(int score[],int length)
{
	int i;
	int sum = 0;
	int aversum = 0;
	for(i = 0;i < length;i++)
	{
		sum += score[i];
	}
	return sum / length;
}

[陈思有]

#include<stdio.h>
#define n 10
void menu();
int inputScore(int s[],int length);
void outputScore(int s[],int length);
int queryScore(int score[],int length,int xScore);
int aversum(int score[],int length);
int main()
{
int score[n],avers = 0;
int cha = 0,chengji = 0,find,x;
int choice;

while(1)
{
fflush(stdin);
menu();
printf("请选择1.2.3.4.5\n");
choice = getchar();
switch(choice)
{
case '1':
chengji = inputScore(score,n);
break;
case '2':
outputScore(score,chengji);
break;
case '3':
printf("请输入要查找的成绩:");
scanf("%d",&x);
find = queryScore(score,chengji,x);
if (find >= 0)
printf("%d\n",find);
else printf("对不起没有\n");
break;
case '4':
avers = aversum(score,chengji);  //应该传递的是chengji而不是n
printf("%d\n",avers);
break;
case '5':
exit(0);break;
default:printf("输入错误!\n");break;
}
}
return 0;
}
void menu()
{
printf("****************************************\n");
printf("* 学生成绩管理系统 *\n");
printf("* *\n");
printf("* 1.录用 *\n");
printf("* 2.输出 *\n");
printf("* 3.查询 *\n");
printf("* 4.排序 *\n");
printf("* 5.结束 *\n");
printf("* *\n");
printf("****************************************\n");
}
int inputScore(int score[],int length)
{
int i = 0;
int tmp;
printf("请输入学生的成绩（以-1结束输入):\n");
for(i = 0;tmp != -1 && i < length;)
{
printf("第%d个学生：",i+1);
scanf("%d",&tmp);
	if(tmp >= 0&&tmp <= 100)
	{
		score[i] = tmp;
		i++;  // i++应该放在这里，应为只有在成绩满足条件的情况下，才将成绩放入数组
	}
}
return i;
}
void outputScore(int score[],int length)
{
int i=0;

printf("学生成绩如下：\n");
for(i=0;i<length;i++)
printf("%d %-3d\n",i+1,score[i]);
printf("\n");
}
int queryScore(int score[],int length,int xScore)
{
int i;

for(i = 0;i < length;i++)
{
if(xScore == score[i])
  {
return i+1;  //  返回i+1比较好，因为你要看到的是返回第几个的学生，这样形象
  }
  }
return -1;
}
int aversum(int score[],int length)
{
int i;
int sum = 0;
int aversum = 0;
for(i = 0; i < length; i++)
{
sum += score[i];
}
return sum / length;
}    //  总的来说，成绩应该用浮点数表示