Question about C programming

[km]

Routine of the program:-

float ftov()
{
int a;
printf("\n \nEnter number:");
scanf("%d",&a);
OUT=0.000040955*a;
printf("\n OUT=%f\n",OUT);
return OUT;
}

When a = 10000, OUT = 0.40955
But why when a = 100000, OUT gives negative value (-1.272554) instead of 4.0995:?:

 

[sreeni]

I would like to know which is the compiler u r using.

 

[addicted]

hi

i think u should try the same code in microsoft VC++ compiler.
its complier problem u may be using 16 or 32 bit complier.
u may be trying this code in TC,thats y its not working

 

[svicent]

In line

int a;

int is a 16 bit value. The value 100000 is 0x186a0, and when you assign a = 100000 the value is truncated to 16 bits, so the variable a equals to 0x86a0. The value 0x86a0 is equal to value -31072, so you get the value (-1.272554) instead of 4.0995.

You must replace line
int a;
with
long a;

Regards, svicent