c - 打印二维阵列框

Question

我是编程新手。考虑如何使用 for 循环打印出盒子，这样它就会成为一个大盒子？我附上了下面的样本。我真的需要帮助。

#include <stdio.h>

int main()
{     
 int a;

 printf("\n --- \n");
 for(a=1;a<=1;++a)
 printf("\n|   |\n");
 printf("\n --- ");

 return 0;
}

示例输出:

Answer 1

这样的东西可以工作。您需要对嵌套循环有基本的了解才能完成此问题。

#include <stdio.h>
#include <stdlib.h>

int
main(int argc, char const *argv[]) {
    int rows, cols, i, j;

    printf("Enter rows for box: ");
    if (scanf("%d", &rows) != 1) {
        printf("Invalid rows\n");
        exit(EXIT_FAILURE);
    }

    printf("Enter columns for box: ");
    if (scanf("%d", &cols) != 1) {
        printf("Invalid columns\n");
        exit(EXIT_FAILURE);
    }

    printf("\n2D Array Box:\n");
    for (i = 1; i <= rows; i++) {
        for (j = 1; j <= cols; j++) {
            printf(" --- ");
        }
        printf("\n");
        for (j = 1; j <= cols; j++) {
            printf("|   |");
        }
        printf("\n");
    }

    /* bottom "---" row */
    for (i = 1; i <= cols; i++) {
        printf(" --- ");
    }

    return 0;
}