Programing

Question

Explanation pls ?
 

void main(){
float a;
a=6.7;
if(a==6.7)
printf("A");
else
printf("B");
}

Answer 1

Output:Print B

 if(a==6.7)

Here float is compared with double condition become false.

float and double are two different data types in C for storing real numbers. double occupies twice the memory occupied by float.

We know that numbers or any data in computers are stored in binary and not in decimals. So before storing 6.7 to variable 'a', computer converts it to its binary equivalent.

While storing this value in float variable, only some bits are stored, depending on the size of float variable, and rest are discarded. So the number stored is bit smaller than 6.7 itself. And hence the comparison fails.

To get rid of problem make

(i) make variable  a  double

or

(ii) type cast a to float

Comments

In the line 4,

if(a==6.7), a is float and by default compiler considers 6.7 as double. Then the comparison becomes if(float==double) and shall be evaluated to false... That's why it is printing "B"