C语言例程23：数组应用

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
    int select;
    int i, j;
    int score[5][7];
    int average = 0;
    int sum = 0;
    do{
        printf("本程序有4项功能：\n");
        printf(" 1. 根据学号查询学生成绩\n");
        printf(" 2. 根据考试号统计成绩\n") ;
        printf(" 3. 根据考试号和学号查询成绩\n");
        printf(" 4. 成绩录入\n");
        printf(" 0. 退出\n");
        printf(" 请输入选择(0 - 4): ");
        scanf("%d", &select);
        switch(select)
        {
        case 0:
            printf("OK\n");
            exit(0);
            break;
        case 1:
            printf("输入学号：");
            scanf("%d\n", &i);
            for(j=1; j<7; j++)
            {
                printf("第%d科成绩是%d\n", j, score[i][j]);
                sum += score[i][j];
            }
            average = sum/6;
            printf("学生的平均成绩是%d\n", average);
            break;
        case 2:
            printf("输入考试号：");
            scanf("%d\n", &j);
            for(i=1; i<5; i++)
            {
                printf("第%d号学生本科成绩是%d\n", i, score[i][j]);
                sum += score[i][j];
            }
            average = sum/4;
            printf("本科平均成绩是%d\n", average);
            break;
        case 3:
            printf("输入学号和考试号：");
            scanf("%d %d\n",&i, &j);
            printf("第%d号学生的第%d科考试成绩是%d\n", i, j, score[i][j]);
            break;
        case 4:
            printf("请输入成绩\n");
            for(i = 1; i < 5; j ++)
                for(j = 1; j < 7; j++)
                scanf("%d\n", &score[i][j]);
            break;
        default:
            break;
        }
    }while(1);
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    system("pause");
    return 0;
}