C語言——學生成績管理系統

/* ***********************
author : C / C#
data   : 2011-8-19
Copyright  2011 
*********************** */  
  6   
  7 #include <stdio.h>  
  8 #include <stdlib.h>  
  9 #include <string.h> 
  10  
 11 #define  N       5 
 12  
 13 void aver(score); 
void menu(int *num , char *name , char *flag);
float *search(int *num , char *flag , char *name , char *p_name , int *p_num , float * score);
void repo(int *stu_num , char *stu_name , float * score , float *score_i);
 18 int main(void)
{
    int number , stu_num[N] = { 2 , 3 , 5 , 8 , 9 };
 22     float score[N][4] = {
        {78 ,67 , 89} ,
        {90 ,87 , 65} ,
        {65 ,54 , 79} ,
        {98 ,87 , 69} ,
        {87 ,70 , 60} ,
    } ;
    float *p_score ;
 31     char stu_name[N][20] = {
        "li dong" ,
        "zhu li" ,
        "wang ming" ,
        "tang tai guo" ,
        "bai dong hui" ,
    };
    char name[20] , flag ;
 40     aver(score);
    menu(&number , name , &flag);
    p_score = search(&number , &flag , name , stu_name , stu_num , score);
    repo(stu_num , stu_name , score , p_score);
 45 }
 47 void aver(float *score_a)
{
    int i , j ;
    float sum ;
 52     for(i = 0 ; i < N ; i++)
    {
        for(sum = 0 , j = 0 ; j < 4 ; j++)
        {
            sum += *(score_a + i * 4 + j);
        }
        *(score_a + i * 4 + 3) = sum / 3 ;   //將平均值賦給每一行的第四位數 59     }
 61     return ;
}
 64 void menu(int *num , char *name , char *flag)
{
    printf("\nSelect the searching method : \n C—————— name | N —————— no : ");
    *flag = getchar();
 69     if(*flag == 'n' || *flag == 'N')
    {
        printf("\nInput student number :");
        scanf("%d" , num);
    }
    else if(*flag == 'c' || *flag == 'C')
    {
        getchar();      //第一次編譯把這個掉了，找了好久才找到 ，要注意  77         printf("\nInput student name :");
        gets(name);
    }
    else 
    {
        printf("\nInput Erroe !");
        exit(1);
    }
 86     return ;
}
 89 float *search(int *num , char *flag , char *name , char *p_name , int *p_num , float *score)
{
    int i ;
 93     if(*flag == 'n' || *flag == 'N')
    {
        for(i = 0 ; i < N ; i++)
        {
            while(*num == *(p_num + i))
                return ( score + i * 4 ) ;
        }
    }
    else if(*flag == 'c' || *flag == 'C')
    {
        for(i = 0 ; i < N ; i++)
        {
            while(strcmp(name , p_name + i * 20) == 0)
                return ( score + i * 4 ) ;
        }
    }
    else 
    {
        printf("\nNot found !");
        exit(1);
    }
}
116 void repo(int *stu_num , char *stu_name , float * score , float *score_i)
{
    int i , j ;
    i = (score_i - score) / 4 ;
    printf("\nNo.\tName\t\tmath\tphys\tengl\taveragr");
122     printf("\n%-8d", *(stu_num + i));
124     printf("%-16s", stu_name + i * 20);
126     for(j = 0 ; j < 4 ; j++)
    {
        printf("%-8.2f", *(score_i + j));
    }
131     printf("\n");
133     return ;
}