为啥结果老是1 4 7 4 7 8 7 8 9

#include
main() {

int n, i, j, y;
int a[n][n];
printf ("enter n:");
scanf ("%d", &n);
for (i = 0; i < n; i++) {
    for (j = 0; j < n; j++) {
        a[i][j] = i * n + j + 1;
    }

}

for (i = 0; i < n; i++) {
    for (j = i; j < n; j++)

    {
        y = a[i][j];
        a[i][j] = a[j][i];
        a[j][i] = y;

    }
}
for (i = 0; i < n; i++) {
    for (j = 0; j < n; j++)

    {
        printf ("%4d", a[i][j]);

    }
    printf ("\n");
}
return 0;

}

第二个for循环在干嘛？你输入的是啥？

• 帮你找了个相似的问题, 你可以看下: https://ask.csdn.net/questions/7664775