[Solved] Printing 2d array box

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Something like this could work. You need basic understanding of nested loops to be able to do this question. 

#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;
}

solved Printing 2d array box