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Float to long conversion

 
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stefan_d6



Joined: 17 Aug 2006
Posts: 6
Location: Varna, Bulgaria

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Float to long conversion
PostPosted: Tue Oct 17, 2006 3:20 am     Reply with quote
I need to convert a float variable to long variable with rounding:
123.45 -> 123
123.56 -> 124

This can be done easily with CEIL() but it returns also float:
123.45 -> 123.00
123.56 -> 125.00

Can I use this to get long:
long_var=ceil(float_var);

Or

sprintf(string_var,"%g",float_var);
long_var=atol(string_var);
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Oct 17, 2006 11:48 am     Reply with quote
The program below shows one way to do it.

Here is the output:
Quote:

rounded a = 123
rounded b = 124


Code:
#include <16F877.h>
#fuses XT, NOWDT, NOPROTECT, PUT, BROWNOUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//=========================================
void main()
{
float a = 123.45;   // Want to round this to 123
float b = 123.56;   // Want to round this to 124

int16 round_a;
int16 round_b;

round_a = (int16)(a + 0.5);
round_b = (int16)(b + 0.5);

printf("rounded a = %ld\n\r", round_a);
printf("rounded b = %ld\n\r", round_b);

while(1);
}
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