#include "stdio.h"

void main()

{ int i,j,n,k,mark=0;

puts("input a number between 1 to 20 :");

scanf("%d",&n);

while(mark!=1)

{

if(n=20 )

{ printf("error,please input a right num:");

scanf("%d",&n);

}

if(n=1)

mark=1 ;

}

for(i=1;i

{

for(k=1;k

printf(" ");

for (j=1;j

printf("+ ");

printf("\n");

}

for(i=1;i

{

for(j=1;j

printf(" ");

for(k=1;k

printf("+ ");

printf("\n");

}

}