Hariom - 1 year ago 51

C Question

`#include<stdio.h>`

void main()

{

float a = 2.3;

if(a == 2.3) {

pritnf("hello");

}

else {

printf("hi");

}

}

It prints "hi" in output, or we can say that if condition is getting false value.

`#include<stdio.h>`

void main()

{

float a = 2.5;

if(a == 2.5)

printf("Hello");

else

printf("Hi");

}

It prints hello.

Answer Source

The variable `a`

is a `float`

that holds some value close to the mathematical value 2.3.

The literal `2.3`

is a `double`

that also holds some value close to the mathematical value 2.3, but because `double`

has greater precision than `float`

, this may be a different value from the value of `a`

. Both `float`

and `double`

can only represent a finite number of values, so there are necessarily mathematical real numbers that cannot be represented exactly by either of those two types.

In the comparison `a == 2.3`

, the left operand is promoted from `float`

to `double`

. This promotion is exact and preserves the value (as all promotions do), but as discussed above, that value may be a different one from that of the `2.3`

literal.

To make a comparison between floats, you can use an appropriate float literal:

```
assert(a == 2.3f);
// ^
```