Use of getchar() ,putchar() functions

     
                             Use of getchar() ,putchar() functions

The use of getchar function is to capture or get the data / the typed character from (single chara) keyboard .

the putchar() is do just opposite of getchar()

It prints directly to the screen , so we dont need use the printf() function .

Look the program and output

here used getchar() function  to get char.
putchar() and printf() function is used to print the given data.

Uses of for loop

                                                        Uses of for loop 

#include
#include

int main()
{

int far;
for(far = 0 ; far <= 300; far +=20)
printf("%3d %6.1f\n" ,far ,(5.0/9.0) * (far - 32));
getch();

return 0;
}

Char Data Type

 the char is used to storing  simple character  

 Unsigned: It consist only positive value i.e 0 to 255.

Signed: It consist both negative and positive values but in different formats like

-1 to -128

• 0 to +127

And this all explanation is about 8 bit number system
Char has 1 byte only 

int main()
{ 
  char a ;

etc 

Working of a floating point data type

Working of a floating point data type 

Look  and understand the program and output shown below  simple understand what will

happen there




#include
#include

 int main(){

float far = 10;
         
       printf("%1.0f\n", far );
  printf("%2.0f\n", far);
  printf("%3.0f\n", far);
  printf("%4.0f\n", far);
  printf("%5.0f\n\n", far);

   printf("%1.1f\n", far );
  printf("%1.2f\n", far);
  printf("%1.3f\n", far);
  printf("%1.4f\n", far);
  printf("%1.5f\n", far);
   
getch();
return 0;
}

Working Of while loop

 The while loop operates as follows , the condition is tested ,if the it is true .
That is the condition is true that means

for example
            10 == 10 . or 10<20 .="" etc="" p="">If it is true the statement in the while loop will be work or execute 


while(i < j )
{
  stament for exection

}



Example
 
   while(far <= upper )

     {  

       celsius = 5 * (far - 32)/9;

       printf("%d\t%d\n", far ,celsius);

       far += step;

  }

it will execute till until the condition will get false  .

that is the far not equal to upper 

NB : 

   The body of the while loop may be single or more line .

  If there is a single line there is no need to add a the curly {} bracket 

Eg : 

       while(i < j)

        i = 2 * i ;  // it will repeat until the condition fall 

K&R text Book page 8

Variable and Arithmetic Operation 

#include

#include



 int main(){



int far ,celsius;

int lower ,upper,step;

  

  lower = 0;

  upper = 300;

  step =20;

   

   far = lower;

   

     while(far <= upper )

     {  

       celsius = 5 * (far - 32)/9;

       printf("%d\t%d\n", far ,celsius);

       far += step;

  }

 

 getch();

 return 0;

}

Uses Of %d in c Programming

 Many Of them getting confusion in %d.  lokk the various output at diffrent %d .ie . %2D ,%3d, %4d etc