如何在void函数中调用另一个void函数

Question

#include<stdio.h>
#define N 3
void main()
{
    #请在此处填空（）;
    int arr[N][N] = {{1,2,3},{4,5,6},{7,8,9}};
    int i,j;
    convert(arr);
    for(i=0;i<N;i++)
    {
        for(j=0;j<N;j++)
        {
            printf("%3d",arr[i][j]);
            printf("\n");
        }
    }
}
void convert(int array[3][3])
{
    int i,j,t;
    for(i=0;i<N;i++)
    {
        for(j=i+1;j<N;j++)
        {
            t = array[i][j];
            array[i][j] = array[j][i];
            array[j][i] = t;
        }
    }
}

Answer 1

#include<stdio.h>
#define N 3
void main()
{
    void convert(int array[3][3]);
    int arr[N][N] = { {1,2,3},{4,5,6},{7,8,9} };
    int i, j;
    convert(arr);
    for (i = 0; i < N; i++)
    {
        for (j = 0; j < N; j++)
        {
            printf("%3d", arr[i][j]);
            printf("\n");
        }
    }
}
void convert(int array[3][3])
{
    int i, j, t;
    for (i = 0; i < N; i++)
    {
        for (j = i + 1; j < N; j++)
        {
            t = array[i][j];
            array[i][j] = array[j][i];
            array[j][i] = t;
        }
    }
}