【求最大值所在的行列号】我这串代码应该怎么修改呢？

#include<stdio.h>
void main()
{
    int j,i,max,r,c,a[5][5]={{34,45,33,22,12},{31,76,19,11,29},
    {88,65,23,99,75},{25,33,44,11,12},{66,98,47,85,39}};
    max=a[0][0];
    r=c,c=0;
    for(i=0;i<=4;i++)
    for(j=0;j<=4;j++)
    if(max,a[i][j])
    {
        max=a[i][j];
        r=i;
        c=j;
    }
    printf("最大值为：%d，其在%d行%d列",max,r+1,c+1); 
}

改正如下：

#include<stdio.h>
void main()
{
    int j, i, max, r, c, a[5][5] = { {34,45,33,22,12},{31,76,19,11,29},
    {88,65,23,99,75},{25,33,44,11,12},{66,98,47,85,39} };
    max = a[0][0];
    c = 0;
    r = c;      //修改处1
    for (i = 0; i <= 4; i++)
        for (j = 0; j <= 4; j++)
            if (max<a[i][j])     //修改处2
            {
                max = a[i][j];
                r = i;
                c = j;
            }
    printf("最大值为：%d，其在%d行%d列", max, r + 1, c + 1);
}