.在屏幕上输出以下图案：

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#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
int main() {
 int i,j,n;
 int a,b;
 scanf("%d", &n);
 for (i = 1; i <= n; ++i){
  for (j = 1; j <= 2i-1;++j) {
   putchar(’’);
  }
   putchar(’\n’);
 }
 for (a = n-1; a >= 1; --a){
  for (b = 1; b <= 2 * a - 1;++b) {
   putchar(’*’);
  }
  putchar(’\n’);
 }
 system(“pause”);
 return 0;
}