求一个300行左右的简单的c语言程序

300行还简单啊，呵呵，你自己去C语言代码库找找啊，应该有你想要的#include
#include
#include struct STU
{
long Num;
int mathScore;
int englishScore;
int computerScore;
int allScore;
int averageScore;
};void sort();
void cal();
void stuPrint();
void stuInput();
#define STUNUM 60/*定义学生数*/STU stu[STUNUM];int main(int argc, char* argv[])
{
stuInput();
cal();
sort();
stuPrint(); return 0;
}void stuInput()
{
int i = 0;

for (;i {
system("cls");

printf("请一个学生输入学号\n");
scanf("%d",&(stu[i].Num));

printf("请输入该学生数学成绩\n");
scanf("%d",&(stu[i].mathScore));

printf("请输入该学生英语成绩\n");
scanf("%d",&(stu[i].englishScore));

printf("请输入该学生计算机成绩\n");
scanf("%d",&(stu[i].computerScore));

}
}void cal()
{
int i = 0;
for (;i {
stu[i].allScore = stu[i].mathScore + stu[i].computerScore + stu[i].englishScore;
stu[i].averageScore = stu[i].allScore / 3;
}
}void sort()
{
STU temp;
int i = 0 , j =0;
for (;i {
for ( j = i+1;j< STUNUM ;j++)
{
if (stu[i].allScore {
memcpy(&temp,&stu[i],sizeof(STU));
memcpy(&stu[i],&stu[j],sizeof(STU));
memcpy(&stu[j],&temp,sizeof(STU));

}
}
}
}void stuPrint()
{
int i = 0;

printf("名次 学号 数学成绩 英语成绩 计算机成绩 总成绩 平均成绩\n");
for (;i {
printf("\n---------------------------------------------------------\n");

printf("%d\t%d\t%d\t%d\t%d\t%d\t%d\n",i+1,stu[i].Num,stu[i].mathScore,
stu[i].englishScore,stu[i].computerScore,
stu[i].allScore,stu[i].averageScore);
}}

#include #define N 50 #include#define USER "admin"#define PASSWORD "12345678"#include#define MAX 10
int NUM; int x; //全局变量 struct student { int number; char name[20]; float score[3]; float ave; float sum;
}stu[N]; void suan(int ); void insert(int );void display(struct student *p,int n ); void paixu(struct student stu[],int n); void add( int n); void del(struct student *p,int n ); void tui(int ); void password(); void pingjunfenpaixu(struct student stu[],int n);void zongfenpaixu(struct student stu[],int n);

void main() { int i=0;
printf("\n\n 欢迎使用学生成绩管理系统 \n");password();suan(x);
} void suan(int i) { char x; printf(" \n\n 1、输入学员信息 \n"); printf(" \n\n 2、增加学员信息 \n"); printf(" \n\n 3、删除学员信息 \n"); printf(" \n\n 4、显示学员信息 \n"); printf(" \n\n 5、排序学员信息 \n"); printf(" \n\n 6、 退出 \n"); printf("\n 请输入选项："); scanf("%d",&x); switch (x) { case 1: { insert(i); //调用函数
break; } case 2: { add(NUM);
break; } case 3: { del(stu,NUM); break; } case 4: { display(stu,NUM); break; } case 5: { paixu(stu,NUM);
break; } case 6: { tui(NUM);break; }default: printf("\n输入有误\n\n"); }
} void insert(int i) { int j; float sum; char ch; do { sum=0; printf("\n请输入学员信息：\n"); printf("\n学号："); scanf("%d",&stu[i].number); printf("\n姓名："); scanf("%s",&stu[i].name); printf("\n三门成绩：\n");

for (j=0;j<3;j++) { printf("\n成绩%d：",j+1); scanf("%f",&stu[i].score[j]); sum+=stu[i].score[j]; stu[i].sum = stu[i].score[0]+stu[i].score[1]+stu[i].score[2]; } stu[i].ave=sum/3; i++; printf("\n是否继续输入学员信息?（y/n）"); fflush(stdin); ch=getchar(); }while(ch=='y' || ch=='Y'); NUM=i; suan(x); } void display(struct student *p,int n) { int i; printf("\n学号\t姓名\t成绩1\t成绩2\t成绩3\t平均分：总分：\n"); for (i=0;inumber,p->name,p->score[0],p->score[1],p->score[2],p->ave,p->sum); }
suan(x);} void paixu(struct student stu[],int n){char x;printf(" \n\n 1、平均成绩排序 \n"); printf(" \n\n 2、总分成绩排序 \n"); printf("\n 请输入选项："); scanf("%d",&x);switch(x){case 1:{pingjunfenpaixu(stu,NUM);break;}case 2:{zongfenpaixu(stu,NUM);break;}default:{printf("请重新输入");
} }}

void pingjunfenpaixu(struct student stu[],int n){float temp; int i,j; for (i=0;i}}}}void zongfenpaixu(struct student stu[],int n){float temp; int i,j; for (i=0;idisplay(stu,NUM); }}}}

void add(int n) { char ch; printf("\n是否需要插入新学员信息?（y/n）"); fflush(stdin); ch=getchar(); if (ch=='y' || ch=='Y') { insert(n); } suan(x); }

void del(struct student stu[],int n) { int num,i=0,j=0; char ch; printf("\n是否需要删除学员信息?（y/n）"); fflush(stdin); ch=getchar(); while (ch=='y' ||ch=='Y') { printf("\n请输入删除学员的学号："); scanf("%d",&num); for (i=0;i
}

void tui(int i) { char ch; printf("\n退出?（y/n）:"); fflush(stdin); ch=getchar(); if (ch=='y' || ch=='Y') { printf("\t----------------------------------------------------------------------\n");printf("\t***************************@@*********@@******************************\n");printf("\t************************@@****@@***@@****@@***************************\n");printf("\t*********************@@**********@**********@@************************\n");printf("\t********************@*************************@***********************\n");printf("\t* @@ @@ *\n");printf("\t* @@ 谢谢使用本程序 @@ *\n");printf("\t***************************@@**********@@*****************************\n");printf("\t******************************@@****@@********************************\n");printf("\t*********************************@@***********************************\n");printf("\t----------------------------------------------------------------------\n");} else { suan(x);
} }

void password() {
char name[21];char pw[11];int i;for(i=0;i<3;i++){printf("\nEnter User name: ");gets(name);printf("\nEnter password :");gets(pw);if((strcmp(name,USER)==0)&&(strcmp(pw,PASSWORD)==0))break;}if(i>2){printf("您已连续3次将用户名或密码输错，系统将退出!");
}
else{
}}

给你个300字的程序，你估计也看不太懂，实际效用不大，还是找本C语言的书看看吧，再多加练习就好，有什么不懂的可以问我，本人QQ314156403

请问你要这程序时做什么的？学习？还是应付作业？