# 矩陣減法程序 > 原文： [https://www.geeksforgeeks.org/c-program-subtraction-matices/](https://www.geeksforgeeks.org/c-program-subtraction-matices/) 下面的程序減去大小為 4 * 4 的兩個平方矩陣，我們可以針對不同的維數更改 N。 ## C++ ```cpp // C++ program for subtraction of matrices #include <bits/stdc++.h> using namespace std; #define N 4? // This function subtracts B[][] from A[][], and stores? // the result in C[][]? void subtract(int A[][N], int B[][N], int C[][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];? }? // Driver code int main()? {? ????int A[N][N] = { {1, 1, 1, 1},? ????????????????????{2, 2, 2, 2},? ????????????????????{3, 3, 3, 3},? ????????????????????{4, 4, 4, 4}};? ????int B[N][N] = { {1, 1, 1, 1},? ????????????????????{2, 2, 2, 2},? ????????????????????{3, 3, 3, 3},? ????????????????????{4, 4, 4, 4}};? ????int C[N][N]; // To store result? ????int i, j;? ????subtract(A, B, C);? ????cout << "Result matrix is " << endl;? ????for (i = 0; i < N; i++)? ????{? ????????for (j = 0; j < N; j++)? ????????cout << C[i][j] << " ";? ????????cout << endl;? ????}? ????return 0;? }? // This code is contributed by rathbhupendra ```