螺旋方阵

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#include <stdio.h>#include <malloc.h>void play(int n){ int row = 0; int col = 0; int num = 0; const int count = n / 2; /* 记录圈数 */ int ix = 0; /* 动态分配二维数组 */ int **A = (int **) malloc(n * sizeof(int *)); A[0] = (int *) malloc(n * n * sizeof(int)); for (ix = 1; ix < n; ++ix) A[ix] = A[ix-1] + n; /* 对于边长为奇数的螺旋方阵，最后一个数要单独填充 */ A[n/2][n/2] = n * n; for (ix = 1; ix <= count; ++ix) { /* 每次填充一圈（共四边），每边n-ix 个数，ix初始为1? */ while (col < n - ix) A[row][col++] = ++num; while (row < n - ix) A[row++][col] = ++num; while (col > ix - 1) A[row][col--] = ++num; while (row > ix - 1) A[row--][col] = ++num; ++row, ++col; } for (row = 0; row < n; ++row) { /* 打印螺旋方阵 */ for (col = 0; col < n; ++col) printf("%4d", A[row][col]); puts(""); } free(A[0]); free(A);}int main(){ int n; while (1) { puts("Please input number:"); scanf("%d", &n); play(n); } return 0;}