Interesting Facts In C Programming

C is a general-purpose, imperative computer programming language. Every programmer know the basic syntax of C Language.

I am here to share some Interesting Facts In C Programming which I came across reading till now. Some of these facts you may know already .

Lets See ..........

A switch statement's case labels can occur inside if-else statements or in loops.

      switch (x)  {  case 1:; // ...

      if (y==2)
      {

        case 2:;
        // ...

      }

      else case 3:
      {
        // ...

        for (b=0;b<10;b++)
        {

          case 4:;
          // ...
        }
      }
      break;

    case 5:
      // ...
      break;}

You can use #include in strange places :

 void main()   {

  printf

  *#include* "next.c"   }

And "next.c" contains :

      ("HackerEarth!\n");

It will print "Hackerearth".

Argument index specification in printf format specifier :

 *#include*  < stdio.h >

void main()   {

  printf ( "%4$d  %3$d  %2$d  %1$d ",  1,  2,  3,  4);    }

It wil Print 4 3 2 1.

Ignoring input in scanf:

 *#include*  < stdio.h >

  void main()    {

    int a;

    scanf("%*d%d", &a);

    printf ( "%d ",  a);       }

If input is 4 5 => a will have value 5 .

Using range with switch cases

  switch(c) {

   case 'A' ... 'Z': //do something

     break;

         case 1 ... 5 : //do something         }

Printf in C allows you to use variables for formatting format specifiers themselves

 *#include*  < stdio.h >

   int main() {

      int a = 3;

       float b = 6.412355;

      printf("%.*f\n",a,b);

     return 0;            }

It will print => 6.412 .... if a=2 it will print => 6.41 .

a[index] is same as index[a]

  *#include*  < stdio.h >

    int main() {

       int a[10];

       a[0]=1;

       printf("%d", 0[a] );

     return 0;     }

It will print output = 1.

'<:, :>, <%, %>' in place of '[, ], {, }',

Earlier years when it was hard to write '[, ], {, }', C actually accepted '<:, :>, <%, %>' respectively .

int main() <%

    int a <: 5 :>;

    a<:0:>=1;

    printf("%d",a<:0:>);

    return 0;

%>

It will print output = 1.

main() is not compulsory.

 *#include*  < stdio.h >

  *#include* DIPAK m##a##i##n

   int DIPAK() {

       printf("HackerEarth.");     }

It prints => "HackerEarth".

That's It. Thank You for reading . If you know more facts about C you can comment below .

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