这个小程序就是为了删除二维数组里面一个已有的数。
当在前面对t赋值的时候，它可以得到正确的答案，而用scanf获得一个数的时候就不行。下面是代码。
#include<stdio.h>
main()
{
    int a[4][4]={1,5,6,7,8,9,10,13,17,32,76,89,98,99,100};
    int i,j,t,p,q,c[3],k=0,m=0;
    for(i=0;i<4;i++)
        {
            for(j=0;j<4;j++)
                printf("%3d ",a[i][j]);
                printf("\n");
        }
    scanf("%d",&t);  
    for(i=1;i<4;i++)
        c[i]=a[i][0];
    for(i=0;i<4;i++)
        {
            for(j=0;j<4;j++)   
                    if(t==a[i][j])
                        {
                            for(p=i;p<4;p++)
                            {
                                if(p!=i)
                                    for(q=1;q<4;q++)
                                        a[p][q-1]=a[p][q];   
                                    
                                else
                                 
                                     for(q=j;q<3;q++)
                                        a[p][q]=a[p][q+1];
                                            
                                
                            }
                                k=1;
                                     break;
                        }
            if(k==1)
                break;
        }
        
    for(p=3;p>i;p--)
        a[p-1][3]=c[p];
        a[3][2]=0;
for(i=0;i<4;i++)
    {
        for(j=0;j<4;j++)
            {
                printf("%3d ",a[i][j]);
                m++;
                if(m==14)
                    break;
            }
            printf("\n");
    }
}