Interesting facts about C programming

Here we will see some interesting facts about C programming. As follows.

• Sometimes the case labels of some switch statements can be placed inside if-else statements.

Example

#include <stdio.h>
main() {
   int x = 2, y = 2;
   switch(x) {
      case 1:
         ;
         if (y==5) {
            case 2:
               printf("Hello World");
         }
         else case 3: {
            //case 3 block
         }
   }
}

Output

Hello World

• Array[index] can be written as index[array]. The reason is that array elements are accessed using pointer arithmetic. The value of array[5] is *(array 5). If the order is reversed like 5[array] then it's the same as *(5 array).

Example

#include <stdio.h>
main() {
   int array[10] = {11, 22, 33, 44, 55, 66, 77, 88, 99, 110};
   printf("array[5]: %d</p><p>", array[5]);
   printf("5[array]: %d</p><p>", 5[array]);
}

Output

array[5]: 66
5[array]: 66

• We can use <: , :> instead of square brackets [,] and <%, %> instead of big brackets{,}.
ul>

Example

#include <stdio.h>
main() <%
int array<:10:> = <%11, 22, 33, 44, 55, 66, 77, 88, 99, 110%>;
printf("array[5]: %d</p><p>", array<:5:>);
%>

Output

array[5]: 66

• We can use #include in some weird places. Here let us consider the file abc.txt which contains the line "The Quick Brown Fox Jumps Over The Lazy Dog". If we include the file after the printf statement, we can print the file contents.

Example

#include <stdio.h>
main() {
   printf
   #include "abc.txt" ;
}

Output

The Quick Brown Fox Jumps Over The Lazy Dog

• We can use %*d in scanf() to ignore the input.

Example

#include <stdio.h>
main() {
   int x;
   printf("Enter two numbers: ");
      scanf("%*d%d", &x);
   printf("The first one is not taken, the x is: %d", x);

}

Output

Enter two numbers: 56 69
The first one is not taken, the x is: 69

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