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

void main()
{
    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; 1<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; i++)
                    for(j=1; j<7; j++)
                        scanf("%d\n", &score[i][j]);
                break;
            default:
                break;
        }
    }while(1);
}
经过调试还是不行，高手们帮忙看看，先谢过了！！！

for(i=1; 1<5; i++)
                 {
                     printf("第%d号学生本科成绩是%d\n", i, score[i][j]);
                     sum += score[i][j];
                 }

这是个死循环

那个不是死循环，我已经找到错了，谢谢！！！

几处scanf()都有点问题。

麻烦你动动脑，自己写错了不知道也就算了，二楼给你指出来了你还没反应过来!!!你把结束循环的条件i<5写成了1<5，1永远小于5，所以是死循环。
还有把scanf里面的\n统统去掉，你看看哪本书的程序用到scanf时有\n

[ 本帖最后由 embed_xuel 于 2012-8-17 08:44 编辑 ]