can any one help me plz!!! what does this means???

while(i-1?++i:j--)

Code:

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int main()    {              int i=-4,j=-2; while(i-1?++i:j--) printf("%d",i); getch (); return 0; }

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and y the output is -3 here??

Code:

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#include<stdio.h>
#include<conio.h>

    int main(){
int i=12;
for(i=100; i > -4; i-=2);
printf("%d", ++i);
getch();
return 0;
}

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It's a different form of if/else...

Outside of the while loop...

Code:

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 x = i -1 ? ++i : j--;

// translates to

if( i -1)
  ++i;
else
  j--;

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It test the value of i-1 if it's non-0 it incremeints i or if it's 0 it decrments j...

Stuffing it into a while loop like that is simply waiting for either i or j to hit 0 ....
But it's also a sure sign of someone trying to be way too clever.