storing a float value

[saurabhamiable]

I would like to know that why float datayppe never stores exact value that is assigned to them?
for eg-> A piece of code
main()
{
float a=.07;
if (a<0.7)
printf("mismatch");
else
printf("C is precise");
}
Output: mismatch

[debasisdas]

Question moved to C Forum.

[rhitam30111985]

I would like to know that why float datayppe never stores exact value that is assigned to them?
for eg-> A piece of code
main()
{
float a=.07;
if (a<0.7)
printf("mismatch");
else
printf("C is precise");
}
Output: mismatch

you have assigned 0.07 to a, and comparing with 0.7... obviously there is a mismatch

[Meetee]

0.07<0.7, it's a normal logic. So if(a<0.7) fulfills the condition and output will be mismatch!!

Regards

[mattmao]

I would like to know that why float datayppe never stores exact value that is assigned to them?
for eg-> A piece of code
main()
{
float a=.07;
if (a<0.7)
printf("mismatch");
else
printf("C is precise");
}
Output: mismatch

If you want to make your code "interactive" with the user, google for "c scanf"

You can change your code to:

main()
   {
         float a;
 
         printf("input a float value\n");
         scanf("%f", &a);
 
         if (a<0.7)
          printf("mismatch");
          else
           printf("C is precise");
  }

[saurabhamiable]

you have assigned 0.07 to a, and comparing with 0.7... obviously there is a mismatch

actually i typed it wrongly, the value assigned to a is 0.7, then there is a mismatch. Kindly let me know.

[Savage]

actually i typed it wrongly, the value assigned to a is 0.7, then there is a mismatch. Kindly let me know.

You cannot compare floats with < operator,because of float point accuracy.Epsilon is your friend.See this ..

Savage

[JosAH]

actually i typed it wrongly, the value assigned to a is 0.7, then there is a mismatch. Kindly let me know.

What Every Computer Scientist Should Know About Floating-Point Arithmetic.

kind regards,

Jos