Write a C program to find absolute value of a number.

#include <stdio.h>
#include <conio.h>
  main()
{
  int num;
  clrscr();
  printf("\n Enter any num to find absolute value");
  scanf("\n %d",&num);
  if(number<0)
{
  num=(-1)*num;
  printf("\n Absolute value is =%d",num);
}
  return (0);
}

 output:-
  enter the value of num =-100
  Absolute value 

  

Write a C program to check if all the three points fall on one straight line.

#include <stdio.h>
#include <conio.h>
  main()
{
  int x1,y1,x2,y2,x3,y3,x4,y4,slope1,slope2;
  clrscr();
  printf("\n Enter 1st co-ordinate (x1,y1)");
  scanf("\n %d%d",&x1,&y1);
  printf("\n Enter 2nd co-ordinate (x2,y2)");
  scanf("\n %d%d",&x2,&y2);
  printf("\n Enter 3rd co-ordinate (x3,y3)");
  scanf("\n %d%d",&x3,&y3);
  slope1=(y2-y1)/(x2-x1);
  slope2=(y3-y2)/(x3-x2);
  if(slope1==slope2)
{
  printf("\n Three points fall on the same line");
}
  else
{
  printf("\nThree points doesn't fall on the same line");
}
  return (0);
}

 output:-
   Enter 1st co-ordinate (x1,y1) =(1,1)
   Enter 2nd co-ordinate (x2,y2) =(1,1)
   Enter 3rd co-ordinate (x3,y3) =(1,1)
   Three points fall on the same line

Write a c program to determine whether the seller profit or loss.

 #include <stdio.h>
#include <conio.h>
  main()
{
   int cp,sp,total;
   clrscr();
   printf("\n enter cost price ");
   scanf("\n %d",&cp);
   printf("\n enter selling price");
   scanf("\n %d",&sp);
   total=sp-cp;
   total=cp-sp;
   if(total>0)
{
   printf("\n  total profit =%d",total);

}
   else
{
   if(total<0)
{
   printf("\n  total Loss =%d",total);
}
   else
{
   printf("\n neither total loss nor total profit");
}
}
   return(0);
}

output:-
  enter the cost price (cp) =100
  enter the sell price (sp) =200
  total profit =100