程序代码：

#include <stdio.h>

void create_magic_square(int n, char magic_square[n][n]);            //这个程序在 Dev-C++ 上编译错误
void print_magic_square(int n, char magic_square[n][n]);

int main(void)
{    
    int n;
    printf("This is program creates a magic square of a specified size.\n");
    printf("The size must be an odd number between 1 and 99.\n");
    printf("Enter size of magic square: ");
    
    scanf("%d", &n);
    
    char a[n][n];                //变长数组无法直接 a[i][j] = {0}； 
    
    create_magic_square(n, a);
    
    print_magic_square(n, a);
    
    return 0;

 } 

 

 void create_magic_square(int n, char magic_square[n][n])

 {
     int num = 1, i, j;
     
     for (i = 0; i < n; i++)
        for (j = 0; j < n; j++)
            magic_square[i][j] = 0;                //清零，为后面替换做准备； 
    
    i = 0, j = n / 2;                        //开始的地方； 
     
    while (num <= n * n) {                        //当 num < n * n 时， 循环下去；  
        if (magic_square[i][j] == 0) {                //当数组元素未被填入非零数字时替换； 
            magic_square[i][j] = num++;
            i = (i - 1 + n) % n, j = (j + 1) % n;        //当要用函数替换这个语句时，发现一个函数无法返回两个值，所以最后放弃用函数； 
        }
        else {                            //当数组元素已被替换时下跑到前一个元素的下面，并继续执行斜向上替换直至结束； 
            i = (i + 2) % n, j = (j - 1 + n) % n; 
            magic_square[i][j] = num++;
            i = (i - 1 + n) % n, j = (j + 1) % n;
        }
    }

 }

 

 void print_magic_square (int n, char magic_square[n][n])

 {
     for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++)
            printf("%5d", magic_square[i][j]);
        putchar('\n');
    }
}