To print diamond asterisk pattern based on inputs


 
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# 1  
Old 08-07-2019
To print diamond asterisk pattern based on inputs

I have to print the number of stars that increases on each line from the minimum number until it reaches the maximum number, and then decreases until it goes back to the minimum number. After printing out the lines of stars, it should also print the total number of stars printed.

I have tried using shell scripting and worked. But is there any other simplified and generic way to achieve this

Code:
echo "enter the mininum number "
read min
echo "enter the maximum number "
read max
for (( i=$min;i<=$max;i++))
do
   for (( j=$max;j>=i;j-- ))
   do
   echo -n " "
   done
   for (( c=1;c<=i;c++ ))
   do
   echo -n " *"
   sum=`expr $sum + 1`
   done
echo ""
done
d_max=`expr $max - 1`
for (( i=$d_max;i>=$min;i--))
do
   for (( j=i;j<=$d_max;j++ ))
   do
   if [ $j -eq $d_max ]
   then
   echo -n " "
   fi
   echo -n " "
   done
   for (( c=1;c<=i;c++ ))
   do
   echo -n " *"
   sum=`expr $sum + 1`
   done
echo ""
done
echo "Total No. : "  $sum

Exepcted output
Code:
 

      *
     * *
    * * *
   * * * *
  * * * * *
   * * * *
    * * *
     * *
      *

# 2  
Old 08-07-2019
This User Gave Thanks to RudiC For This Post:
# 3  
Old 08-07-2019
Ancient books might tell you to
Code:
sum=`expr $sum + 1`

But only the old Bourne shell needs the external expr command for math ops.
Recent standard shells have
Code:
sum=$((sum + 1))

And, since you use (( )) with for, you can even try
Code:
((sum += 1))

or
Code:
((sum++))

# 4  
Old 08-07-2019
Code:
echo "enter the mininum number "
read min
echo "enter the maximum number "
read max
stars=$(printf '%*s' $(( $max * 2 )) '')
stars=${stars//  / *}
cnt=0;
for (( i=$min;i<=$max;i++)); do printf "%*s%s\n" $((( max - i + 1 ))) " " "${stars:1:$((( $i * 2 )))}" ; (( cnt = cnt + i )) ; done
for (( i=$max-1;i>=$min;i--)); do printf "%*s%s\n" $((( max - i + 1 ))) " " "${stars:1:$((( $i * 2 )))}"; (( cnt = cnt + i )) ;done
echo Total: $cnt


Last edited by rdrtx1; 08-08-2019 at 11:32 AM.. Reason: including total count.
# 5  
Old 08-07-2019
Fully dash/POSIX shell only compliant.
Uses terminal escape codes for fun.
Code:
#!/usr/local/bin/dash
# DIAMOND.sh
# POSIX compliant, with no input error checking.
# Using terminal escape codes just for fun.

echo "Enter minimum value:"
read -r MIN
echo "Enter maximum value:"
read -r MAX
printf "\033c\n"
STRNG="* "
COUNT=1
STAR="${STRNG}"
HORIZ=34
VERT=4
while [ ${COUNT} -lt ${MIN} ]
do
    STRNG="${STRNG}"'* '
    COUNT=$(( COUNT + 1 ))
done

STAR="${STRNG}"
COUNT=$(( MAX + 1 ))
while [ ${COUNT} -ge ${MIN} ]
do
    printf "%b" "\033["${VERT}";"${HORIZ}"f${STAR}"
    STAR="${STAR}${STRNG}"
    COUNT=$(( COUNT - 1 ))
    HORIZ=$(( HORIZ - MIN ))
    VERT=$(( VERT + 1 ))
done
HORIZ=34
VERT=$(( VERT + MAX - MIN ))
STAR="${STRNG}"
COUNT=$(( MAX + 1 ))
while [ ${COUNT} -ge ${MIN} ]
do
    printf "%b" "\033["${VERT}";"${HORIZ}"f${STAR}"
    STAR="${STAR}${STRNG}"
    COUNT=$(( COUNT - 1 ))
    HORIZ=$(( HORIZ - MIN ))
    VERT=$(( VERT - 1 ))
done
printf "\033[H"

Result OSX 10.14.3, default bash terminal calling dash, values given, 3 MIN, 10 MAX:
Code:
AMIGA:amiga~/Desktop/Code/Shell> 


                                 * * * 
                              * * * * * * 
                           * * * * * * * * * 
                        * * * * * * * * * * * * 
                     * * * * * * * * * * * * * * * 
                  * * * * * * * * * * * * * * * * * * 
               * * * * * * * * * * * * * * * * * * * * * 
            * * * * * * * * * * * * * * * * * * * * * * * * 
         * * * * * * * * * * * * * * * * * * * * * * * * * * * 
            * * * * * * * * * * * * * * * * * * * * * * * * 
               * * * * * * * * * * * * * * * * * * * * * 
                  * * * * * * * * * * * * * * * * * * 
                     * * * * * * * * * * * * * * * 
                        * * * * * * * * * * * * 
                           * * * * * * * * * 
                              * * * * * * 
                                 * * *

# 6  
Old 08-07-2019
Code:
#!/bin/bash

MIN=1
MAX=10
STARS=0

S=$(printf '%*s' "$((MAX*2))" '')
D=${S//  / *}

for ((N=MIN; N < (MAX*2); N++ && (STARS += W)))
do
        [ "$N" -gt "$MAX" ] && W=$(((MAX*2)-N)) || W="$N"
        [ "$W" -lt "$MIN" ] && break;
        echo "${S:0:$((MAX-W))}${D:0:$((W*2))}"
done

echo "Total stars: $STARS"

Code:
          *
         * *
        * * *
       * * * *
      * * * * *
     * * * * * *
    * * * * * * *
   * * * * * * * *
  * * * * * * * * *
 * * * * * * * * * *
  * * * * * * * * *
   * * * * * * * *
    * * * * * * *
     * * * * * *
      * * * * *
       * * * *
        * * *
         * *
          *
Total stars: 100

These 2 Users Gave Thanks to Corona688 For This Post:
# 7  
Old 08-07-2019
Love that solution Corona688 but the MIN and MAX tests and the loop break feel awkward.

Bash makes it hard without an abs() function, I was forced to use ${A#-} in it's place, but, in my opinion this is an improvement:

Code:
MIN=1
MAX=10

S=$(printf '%*s' "$((MAX*2))" '')
D=${S//  / *}

for((N=MIN; N <= (MAX*2-MIN); N++ && (STARS +=W)))
do
    ((A=N-MAX))
    ((W=MAX-${A#-}))
    echo "${S:0:$((MAX-W))}${D:0:$((W*2))}"
done
echo "Total stars: $STARS"

These 3 Users Gave Thanks to Chubler_XL For This Post:
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