用C++写程序求一个3×3的整数矩阵对角线元素之和用到scanf函数

#include <stdio.h>

int main()
{
    int matrix[3][3];
    int sum = 0;

    printf("Please enter the elements of the matrix:\n");

    // 读取矩阵元素
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            scanf("%d", &matrix[i][j]);
        }
    }

    // 计算对角线元素之和
    for (int i = 0; i < 3; i++) {
        sum += matrix[i][i];
    }

    printf("The sum of diagonal elements is %d\n", sum);

    return 0;
}