C/C++ Puzzles: PART - 9

  Printing Numbers from 1 to 100 

(Without using If, Switch, For, While, Do While and Goto)

 Recently I come across the above mentioned problem. You have to write a C program to print numbers from 1 to 100. But you should not use If, Switch, For, While, Do While or Goto. Here are the three solutions I felt O.K.

//Solution 1

C is case sensitive. So is C++. So the restriction does not apply to the C/C++ keywords if, switch, for, while, do or goto. So you could use the keywords and write an ordinary C program to print the numbers.

//Solution 2

You could use printf( ) function to print the numbers. printf("1\n2\n3\n......99\n100");. May not be the best solution. But it is also a solution.

//Solution 3

Use the ternary operator (? : ) in C/C++. The program is given below.

#include<stdio.h>
int i=0;
int main()
{
   i++;
   printf("\n%d",i);
   (i>99)?i:main();
}

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//Solution 4

Use the Token Pasting operator in C/C++. Token Pasting operator allows you to merge separate tokens. The solution is given below.

#include<stdio.h>
#define LOOP wh##ile
int main()
{
   int i=1;
   LOOP(i<=100)
   {
      printf("\n%d",i);
      i++;
   }
}

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There might be other solutions also. If you know any please post them.