如何在C ++中构造一个复合循环？ [英] How to construct a compound for loop in C++?

问题描述

for 循环的计数器部分（第三部分）中是否允许 c>在我试图获得优雅的书面代码产生一个直角三角形，我写了这个，但它不会编译：

Is another for loop allowed in the counter section (third part) of a for loop? In my attempt to get elegant in writing code to produce a right triangle, I wrote this but it wouldn't compile:

#include <stdio.h>
int main()
{   
    int i, j, N = 5;
    for (i = 1;
         i <= N; 
         (for (j = 1; j <= i; j++, printf("%c", '0'));), i++)
       printf("\n");
    }
    return 0;
}

推荐答案

=http://stackoverflow.com/users/12711/michael-burr> Michael Burr 建议使用 lambda 。感谢评论者请求我使用 putchar（）。

Hat tip to Michael Burr for the suggestion to use lambda. And thanks to the commentators requesting me to use putchar().

#include <stdio.h> 

int main() 
{ 
  int N;
  scanf ("%d",&N);

  for (int i = 0;
       i < N; 
       i++, 
       [i] {for (int j = 1; 
                 j <= i; 
                 j++, 
                 putchar('0'));}(), 
                 printf("\n"));

  return 0;
}

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