c语言矩阵加减乘法运算

矩阵加减乘法是常见的线性代数运算，在C语言中可以通过数组和循环实现。下面是简单的C语言代码示例：

矩阵加法：

#include <stdio.h>

void matrix_add(int A[][3], int B[][3], int C[][3], int n) {
    int i, j;
    for (i = 0; i < n; i++) {
        for (j = 0; j < n; j++) {
            C[i][j] = A[i][j] + B[i][j];
        }
    }
}

int main() {
    int A[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
    int B[3][3] = {{9, 8, 7}, {6, 5, 4}, {3, 2, 1}};
    int C[3][3];
    int i, j;
    matrix_add(A, B, C, 3);
    printf("A + B = \n");
    for (i = 0; i < 3; i++) {
        for (j = 0; j < 3; j++) {
            printf("%d ", C[i][j]);
        }
        printf("\n");
    }
    return 0;
}

矩阵减法：

#include <stdio.h>

void matrix_sub(int A[][3], int B[][3], int C[][3], int n) {
    int i, j;
    for (i = 0; i < n; i++) {
        for (j = 0; j < n; j++) {
            C[i][j] = A[i][j] - B[i][j];
        }
    }
}

int main() {
    int A[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
    int B[3][3] = {{9, 8, 7}, {6, 5, 4}, {3, 2, 1}};
    int C[3][3];
    int i, j;
    matrix_sub(A, B, C, 3);
    printf("A - B = \n");
    for (i = 0; i < 3; i++) {
        for (j = 0; j < 3; j++) {
            printf("%d ", C[i][j]);
        }
        printf("\n");
    }
    return 0;
}

矩阵乘法：

#include <stdio.h>

void matrix_mul(int A[][3], int B[][3], int C[][3], int n) {
    int i, j, k;
    for (i = 0; i < n; i++) {
        for (j = 0; j < n; j++) {
            C[i][j] = 0;
            for (k = 0; k < n; k++) {
                C[i][j] += A[i][k] * B[k][j];
            }
        }
    }
}

int main() {
    int A[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
    int B[3][3] = {{9, 8, 7}, {6, 5, 4}, {3, 2, 1}};
    int C[3][3];
    int i, j;
    matrix_mul(A, B, C, 3);
    printf("A * B = \n");
    for (i = 0; i < 3; i++) {
        for (j = 0; j < 3; j++) {
            printf("%d ", C[i][j]);
        }
        printf("\n");
    }
    return 0;
}

上述示例中的矩阵都是3x3的，可以根据实际情况进行修改。