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Yes! The frist time try "if-else". Like I said above, here is the code:

#include<stdio.h>
main()
   {
   int a,b,x;
   printf("\n Input a: ");
   scanf("%d",&a);
   printf("\n Input b: ");
   scanf("%d",&b);
   if (a=0)
      {
      if (b=0)
         printf("\nThe equation has unlimited result");
      else 
         printf("\nThe equation has no result");
      getch();
      }
   else
      {
      x=-b/a;
      printf("\nThe equation has only 1 result x= %d", x);
      getch();
      }
   }

The problem is: I have compiled successfully in Dev-C++. But when I run it, the program crash after input 2 numbers (a and b) (The program has stoped working...).


[edit]Indentation corrected so the flow is clear - OriginalGriff[/edit]
Posted 7-Sep-12 17:18pm
Edited 7-Sep-12 21:11pm
v2
Comments
enhzflep at 7-Sep-12 23:46pm
   
Hint:


#include <stdio.h>
int main()
{
int a=2, b=10;
if (a=b)
printf("Oops! Think I stuffed-up my comparison. I should've used == instead of =\n");
else
printf("how the hell did program execution get here?\n");
}
Minh Hikari at 8-Sep-12 1:10am
   
yeah! I think i unserstand what you mean...:D Thank you very much!!! But i still have a question: what is the different between "=" and "=="?
enhzflep at 8-Sep-12 1:13am
   
Well, = is an assignment operator, while == is a comparison operator.

a = 5; - assignment (Set a to 5)
if (a==5) - comparison (Check if a is 5)
Minh Hikari at 8-Sep-12 1:19am
   
ok! I understand clearly now..^^ Thank you very much!!!^^

1 solution

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Solution 1

Make a habit of doing comparisons like this :
if (0 == a)
if you mistakenly do this :
if (0 = a)
compilation will fail because 0 cannot be assigned.
This kind of error is very common and even professional programmers still make this error sometimes, but the above trick helps avoid having to look for this kind of error.
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