C - Datatypes Justify Output

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Datatypes Justify Output

#include
void main()
{
float a=0.7;
if(a<0.7)
printf("yes");
else
printf("no");
}
what is the answer and reason.

Total Answers and Comments: 5

Last Update: July 31, 2009 Asked by: patchillaramkumar

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Best Rated Answer

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Submitted by: ananth3335

in c, the floating point number shouldn't used in codition statement.
the compiler take like below for given code,
if(0.699<0.7)
so , the output will be "yes"

Above answer was rated as good by the following members:
RoMBiN, munnaspartacus, lifeisbeautiful

March 31, 2008 01:46:41

ananth3335

Member Since: February 2008 Contribution: 14

RE: Datatypes Justify Output

in c the floating point number shouldn't used in codition statement.
the compiler take like below for given code
if(0.699<0.7)
so the output will be "yes"

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2 0

Overall Rating: +2

April 11, 2008 06:11:52

pavan.mustyala

Member Since: April 2008 Contribution: 7

RE: Datatypes Justify Output

All floating point values are stored as double. So in the given program the value of variable "a" is interpreted as 0.69999999 thus "double" is truncated to "float".

Even Some compillers will generate a warning as follows :

initializing' : truncation from 'double' to 'float'

This is one possible reason for the wrong output.

NOTE : Also during condition checking there will be implicit type conversion among the different data types and their values thus leading to unexpected results.So one should be very careful when checking for variables of different data types.

The if condition in the above can be modified as

if(a < (float)0.7) to get the correct output(expected output).

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1 0

Overall Rating: +1

April 11, 2008 13:03:40

ashoksurati

Member Since: April 2008 Contribution: 13

RE: Datatypes Justify Output

I go with my friend Pawan.

The output of the above program is Yes.

ThankU
Ashok

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June 06, 2008 03:50:48

shweta mathur

Member Since: June 2008 Contribution: 1

RE: Datatypes Justify Output

When
a 0.7
internally compiler treats 0.7 as double.
Now a is a float and float is always small then double so the if condition is true and answer will be

YES

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July 31, 2009 08:42:37

gauravmitbhu

Member Since: July 2009 Contribution: 1

RE: Datatypes Justify Output

#include<stdio.h>
#include<conio.h>

void main(voif)
{
float a 0.9 b 0.9;
double c 0.9;
if(a<b)
printf("yes for b");
else
printf("no for b");

if(a<c)
printf("nyes for c");
else
printf("nno for c");

getch();
}

Output:
no for b
yes for c

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