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Would you plz chq where is the problem in my code that results Presentation Error??? number 637.

Here is the code..
//637...Booklet printing

#include<math.h> //for ceil()
#include<stdio.h>

int main()
{
int a[25][4];

int i,j,count,page_req;
int x;

while( (1==scanf("%d",&page_req))&&page_req ...