C语言逆置矩阵

要逆置矩阵，可以先将矩阵进行转置，再将每一行的元素逆序排列。以下是一个示例代码：

#include <stdio.h>

void transpose(int mat[][3], int row, int col) {
    int temp;
    for (int i = 0; i < row; i++) {
        for (int j = i+1; j < col; j++) {
            temp = mat[i][j];
            mat[i][j] = mat[j][i];
            mat[j][i] = temp;
        }
    }
}

void reverse(int mat[][3], int row, int col) {
    int temp;
    for (int i = 0; i < row; i++) {
        for (int j = 0; j < col/2; j++) {
            temp = mat[i][j];
            mat[i][j] = mat[i][col-j-1];
            mat[i][col-j-1] = temp;
        }
    }
}

void printMatrix(int mat[][3], int row, int col) {
    for (int i = 0; i < row; i++) {
        for (int j = 0; j < col; j++) {
            printf("%d ", mat[i][j]);
        }
        printf("\n");
    }
}

int main() {
    int mat[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

    printf("Original matrix:\n");
    printMatrix(mat, 3, 3);

    transpose(mat, 3, 3);
    printf("Transposed matrix:\n");
    printMatrix(mat, 3, 3);

    reverse(mat, 3, 3);
    printf("Reversed matrix:\n");
    printMatrix(mat, 3, 3);

    return 0;
}

输出结果为：

Original matrix:
1 2 3
4 5 6
7 8 9
Transposed matrix:
1 4 7
2 5 8
3 6 9
Reversed matrix:
7 4 1
8 5 2
9 6 3