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C语言编程部分打印如下字符图形到屏幕上和字符文件a1.txt中，打印行数n由键盘输入#include <cstdio>int main() { int n; FILE *fp; scanf("%d", &n); fp = fopen("a1.txt", "w"); for (int i = 1; i <= n; i++) { for (int j = 1; j <= i; j++) { f

C语言编程部分1.逆序输出数字#include <cstdio>int num[100];void fun(int n) { int len = 0; //记录位数 while (n) { num[len++] = n % 10;//取余数 n /= 10; } for (int i = 0; i < len; i++) { printf("%d", num[i]); }}int ma