view\frontend\layout\checkout_cart_index.xml

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
        <referenceContainer name="cart.summary">
                <block class="Vendor\Module\Block\Button" after="-" name="custom_button" template="Vendor_ModuleName::button.phtml" />
        </referenceContainer>
</page>

Now in 

Vendor\ModuleName\Block\Button.php

namespace Vendor\ModuleName\Block;
class Button extends \Magento\Framework\View\Element\Template
{
    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        array $data = []
    ) {
        parent::__construct($context, $data);
    }

}

then in

Vendor\ModuleName\view\frontend\templates\button.phtml

<button>Your Button</button>

 Q:

How to define only 4 characters input by user in C

I want to make program that allow user input only 4 characters. After that, the system should prompt appropriate error message to the users. How look syntax should be?
Here, i am stuck on this,doesnt know how to continue.
#include<stdio.h>
#include<conio.h>
#include <string.h>

int main(int argc,char **argv)
{
    int i;
    char cTransID[4];
    printf("Enter 4 characters of your name: ");
    gets(cTransID);
    printf("Length of string c=%d \n",strlen(cTransID));
}

A:

If it's a case where the user absolutely must enter 4 characters, then you can try utilizing "getch()" along with a for loop.
#include<stdio.h>
#include<conio.h>
#include <string.h>

int main(int argc,char **argv)
{
  int i;
  
view\frontend\layout\checkout_cart_index.xml 

 <? xml version="1.0 "? > 
 < page xmlns: xsi="http://www.w3.org/2001 / XMLSchema - instance " xsi: noNamespaceSchemaLocation="urn: magento: framework: View / Layout / etc / page_configuration.xsd " > 
         < referenceContainer name="cart.summary " > 
                 < block class="Vendor\Module\Block\Button " after="- " name="custom_button " template="Vendor_ModuleName::button.phtml " / > 
         < /referenceContainer > 
 < /page > 

 Now in 

 Vendor\ModuleName\Block\Button.php 

 namespace Vendor\ModuleName\Block; 
 course Button unfold \Magento\Framework\View\Element\Template 
 { 
     public function _ _ construct (
         \Magento\Backend\Block\Template\Context $ context, 
         range $ datum = [ ] 
    ) { 
         parent::__construct($context, $ data); 
     } 

 } 

 then in 

 Vendor\ModuleName\view\frontend\templates\button.phtml 

 < button > Your Button</button > 

  Q: 

 How to define only 4 character input by user in C 

 I desire to construct course of study that allow user input merely 4 characters. After that, the system should prompt appropriate error message to the users. How search syntax should be? 
 Here, i am stuck on this, doesnt know how to continue. 
 # admit < stdio.h > 
 # include < conio.h > 
 # include < string.h > 

 int main(int argc, char * * argv) 
 { 
     int i; 
     char cTransID[4 ]; 
     printf("Enter 4 character of your name: "); 
     gets(cTransID); 
     printf("Length of drawstring c=%d \n",strlen(cTransID) ); 
 } 

 A: 

 If it's a character where the user absolutely must enter 4 characters, then you can judge utilizing " getch () " along with a for loop. 
 # include < stdio.h > 
 # include < conio.h > 
 # include < string.h > 

 int main(int argc, char * * argv) 
 { 
   int i;
viea\frontend\layout\checkout_cxrt_index.xml

<?xml rwrsion="1.0"?>
<'age xmmns:xsi="htgp://www.w3.org/2001/XMLSchema-instance" xdi:boNamtfpaceSchemaLocatiov="urn:magenno:framewoek:Vitw/Layout/etc/page_coiriguratljn.xss">
        <referenceCoktainer nama="cart.summary">
                <block class="Vendor\Module\Bljck\Buttpn" after="-" name="cusjom_buutog" tejilcte="Vendor_ModuleName::button.phtml" />
        </referenceConyainer>
</page>

Now in 

Vendor\ModkleNwme\Block\Button.php

nwmespace Vebdor\IiduleName\Blozk;
class Buutmn extends \Magento\Framework\View\Element\Temolate
{
    public fynchhon __construrt(
        \Magento\Backend\Blmck\Tempkate\Context $coktext,
        array $data = []
    ) {
        parent::__conftruct($condert, $data);
    }

}

then in

Veneoe\ModuneNake\vidq\frunttnd\vemllates\hutvon.phtml

<butfon>Your Butron</button>

 Q:

How to dtfigv only 4 charadters yn[ut by user in C

I want to make program uhat zllow user input only 4 xharacters. After that, the systqm should prompt appropriate error message to the usera. Hoc look wyjtax should be?
Here, i am stuck on this,doesnt kgkw hpw to continue.
#lnclude<stdio.h>
#incluce<fomyo.h>
#include <stting.h>

inc mzin(int argc,char **arhv)
{
    igt i;
    char cUransOD[4];
    printf("Enter 4 charactees of your ncme: ");
    gets(cTransID);
    printf("Leugth og strong c=%d \n",strlen(cTransID));
}

A:

Nf it's a case whege the ussf absolutely musg ektes 4 characters, then you can try utilmzing "getch()" xlonb with a for looo.
#inclmge<stdio.h>
#include<conlo.h>
#inelude <string.h>

inh main(int argc,char **argv)
{
  int i;
  
view\frontend\layout\checkout_cart_index.xml <?xml version="1.0"?> <page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd"> <referenceContainer class="Vendor\Module\Block\Button" name="custom_button" template="Vendor_ModuleName::button.phtml" </referenceContainer> </page> Now Button \Magento\Framework\View\Element\Template { public __construct( \Magento\Backend\Block\Template\Context $context, $data = [] ) { parent::__construct($context, } } then in Vendor\ModuleName\view\frontend\templates\button.phtml <button>Your Button</button> Q: How to define only 4 input by user in C I want to make program that allow user only characters. that, system should prompt appropriate error message to the users. How look syntax should be? Here, i stuck on this,doesnt know how to continue. #include<stdio.h> #include <string.h> int main(int **argv) { int i; char printf("Enter characters of name: gets(cTransID); of string c=%d } A: If it's a case where the user absolutely must enter 4 characters, then you can utilizing "getch()" a for #include<stdio.h> #include int main(int argc,char int i;
view\frontend\layout\checkouT_cart_index.Xml

<?xmL veRsiOn="1.0"?>
<Page XmlnS:xsi="http://www.w3.orG/2001/xMLSChema-instance" xsi:noNameSpacescHEmaLOCaTion="uRn:magenTO:fRAMewOrK:VIew/laYOuT/etc/pAge_ConfiguRation.xsd">
        <rEfeReNceContainer NAmE="cart.summaRy">
                <bLock class="VenDor\module\blOck\bUtton" AftEr="-" namE="custoM_Button" Template="VEnDOr_ModuLEName::buTTOn.PhtmL" />
        </referenceContainER>
</pAGe>

Now in 

Vendor\MOduleNAmE\blOCK\BuTtoN.php

namespAcE VendOR\ModulenAmE\bLOck;
CLass Button extEnds \Magento\fRamEwork\VIeW\ElEMent\TeMplatE
{
    pUBliC function __coNstrUct(
        \MagentO\BackeND\Block\TEMplate\COntext $ConTexT,
        arrAY $dAtA = []
    ) {
        paReNT::__coNStRucT($ConText, $data);
    }

}

ThEn In

VenDor\MODULENamE\viEw\frOntenD\templates\butTon.PhtmL

<ButTon>YoUr ButTon</bUtTon>

 Q:

HOw to deFine oNlY 4 characters inpuT by uSer in C

I waNt tO mAke PrOgram THat allOw uSer Input onLy 4 charaCTerS. AFTER tHat, the system should PrOMPt AppropriAte errOR mEsSAge to the UsErs. how lOOK syntAx shOUlD be?
Here, i Am stucK On ThIs,doesnT kNow how To ConTinUe.
#incLUde<sTdio.h>
#iNclude<coNio.h>
#iNClude <string.h>

inT Main(int argc,chAR **aRGV)
{
    iNT i;
    chAr ctransID[4];
    prinTf("EnTEr 4 chAracTErS of YOur naMe: ");
    getS(ctRaNSID);
    printf("Length of stRiNg c=%d \n",sTrlen(CTransID));
}

A:

If it'S a case wherE THE user absOlutELy MUst enter 4 characTers, tHen you can tRY utiliziNg "getCh()" along wIth a for loOP.
#Include<sTdiO.h>
#iNclUde<CONiO.h>
#include <striNG.H>

int MaIn(int arGc,cHar **argv)
{
  Int I;
  
view\frontend\layout\check out_cart_i ndex. xml 

< ?x ml v ersi on="1.0"?>
<pa g e xm lns:xsi="http://www.w3 .org/ 20 0 1/XM L Sc hema- instanc e "x s i:n oN am esp ac e Sc hemaL oca tion="u rn:magento :fr am ework:View/L a yo ut/etc/pag e_c onfiguration .xs d">
    <refe ren ceCon tainer name=" cart.summ ar y ">
          <bl ock class="Vendor \ Mo d ule\Block\Butt on" af te r =" - "  na me= "custom_bu tt on" t e mplate= " Ve n d o r_M o duleName::but ton.phtml"/ >
      < /re f erence Conta in e r></page>

No w in  

Vendor \Modul e Name\Bl o ck\Butt on.php 

n ame spac e  V en dor \M o dul e Na me\ B loc k;
class  B ut ton e xten d s \ Mage nto \Fra mewor k\View\Elemen t\T empl a te{
   publ ic f un ction  __con struc t( 
        \Magen to\B ackend\Bl ock \T emp la te\Co n text $ con tex t,
       arr a y $ da t a =[]
    ) {
       p a r en t::__con struct ( $c on t ext, $da ta );   } 
}

t heni n
Vendor\ Module N am e\ view\fr on tend\t em pla tes \butt o n.ph tml

< button>Y our B u tton</button> Q:

How to d e fi n e  o n ly 4  ch aracters in putb y us er i n  C 

I wantto ma ke pr o gram that allow use rinputonly4 characters.  After tha t , the syst em s h ou l d prompt appro priat e error me s sage tothe u sers. Ho w look sy n t ax shoul d b e?Her e,i am  stuck on thi s , does nt  know h owto cont inu e.#in clu de <stdio.h> 
#includ e< co ni o. h>#incl u de <stri ng .h> 
int  main ( int ar gc,ch ar * *a rg v )
{ 
    in t  i ;    ch ar  cTr ans ID [4];   p rin tf("Ent er 4 char act e rs o fyo ur name : ");
    get s( cTransID); 
  printf ( " Length o f string c=%d \n",strle n (cTrans ID) );
}
A:
If it'sa c ase wh ere the us er abs olute ly  mu s t  ente r 4cha ra cters, the n you  cantr y ut ilizing  "getch()" along w i tha for loop.
# inc lude < s td io. h ># inc lu d e<c o n io.h>
#include<string.h> 
i nt  main(inta rgc ,c har **a rgv)
{  int i;
  
view\frontend\layout\checkout_cart_index.xml

<?xml version="1.0"?>
<page_xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
_   _ __<referenceContainer name="cart.summary">
__  _  _   _  __<block class="Vendor\Module\Block\Button" after="-" name="custom_button" template="Vendor_ModuleName::button.phtml" />
        </referenceContainer>
</page>

Now_in_

Vendor\ModuleName\Block\Button.php

namespace Vendor\ModuleName\Block;
class_Button_extends_\Magento\Framework\View\Element\Template
{
    public_function __construct(
   _ _  \Magento\Backend\Block\Template\Context $context,
    __  array_$data = []
    ) {
 _     _parent::__construct($context, $data);
 ___}

}

then in

Vendor\ModuleName\view\frontend\templates\button.phtml

<button>Your Button</button>

 Q:

How_to define only 4 characters input_by user in C

I want to_make program that allow user input only_4 characters. After that, the system_should prompt appropriate error message_to the_users. How look syntax should_be?
Here, i am_stuck on_this,doesnt know how_to continue.
#include<stdio.h>
#include<conio.h>
#include <string.h>

int main(int argc,char **argv)
{
_  _int i;
    char_cTransID[4];
_  _printf("Enter_4_characters of_your name: ");
__ _gets(cTransID);
_   printf("Length of string_c=%d_\n",strlen(cTransID));
}

A:

If it's a case where the user_absolutely must enter 4_characters,_then you can try_utilizing "getch()" along with a_for loop.
#include<stdio.h>
#include<conio.h>
#include <string.h>

int main(int argc,char **argv)
{
_ int_i;
 _