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  1. #include <stdio.h>
  2.  
  3. void tri_rec(int n, int m) {
  4.     int i;
  5.     if (m == 1) {
  6.     	// line with spaces and 1 +
  7.         for (i = 0; i < n - 1; i++) putchar(' ');
  8.         puts("+");
  9.         return;
  10.     }
  11.     tri_rec(n, m - 1); // recurse for previous lines
  12.  
  13.     // print spaces, 1 +, 0 or more minuses, another +
  14.     for (i = 0; i < n-m; i++) putchar(' '); // spaces
  15.     putchar('+');                           // +
  16.     for (i = 0; i < m-2; i++) putchar('-'); // minuses
  17.     puts("+");                              // +
  18. }
  19.  
  20. void tri(int n) {
  21.     tri_rec(n, n-1);                          // first lines
  22.     for (int k = 0; k < n; k++) putchar('+'); // last line
  23.     puts("");
  24. }
  25.  
  26. int main(void) {
  27. 	tri(7);
  28. 	return 0;
  29. }
  30.  
Success #stdin #stdout 0s 4888KB
comments (?)
stdin 
Standard input is empty
stdout 
      +
     ++
    +-+
   +--+
  +---+
 +----+
+++++++
https://ideone.com/9S9WjB
triangle
language:
C (gcc 8.3)
created:
4 years ago
visibility:
secret

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