# C program

write a function absolute that returns the magnitude of a number.test your function with a program which is terminated by the sentinel 999 as shown in the following input:

sample output

enter a real number:-71.32

the absolute value is -71.320

enter a real number:65.1

the absolute value is 65.100

enter a real number:999

the absolute value is 999.000

thank for trying this program!

Rating

what do u mean for an &quot;absolute value&quot;?

the absolute value for -71.32 is 71.32.

for the define of absolute value is

In mathematics, the absolute value (or modulus which is Latin for a small measure) of a real number is its numerical value without regard to its sign. So, for example, 3 is the absolute value of both 3 and −3. In computer programming, the mathematical function used to perform this calculation is usually given the name abs().

pls check following code that the absolute value had changed to above algorithms.

#include <stdio.h>;

#include <math.h>;

void main( )

{

float dNum1;

for ( ; ; )

{

printf( "Enter a real number : " );

scanf( "%f", &dNum1 );

printf( "The value is %.3f\n", dNum1 );

printf( "The absolute value is %.3f\n\n", fabsf( dNum1 ) );

if ( dNum1 == 999 )

break;

}

printf( "Thank for trying this program!\n" );

}

OK?

2008-03-28 16:47:45 補充：

http://en.wikipedia.org/wiki/Absolute_value