[SOLVED] how to perform an operation on value greater then 65535?

[uday mehta]

i me counting something from 0 to 99999. here if i use an integer and increment it then it will reached its limit i.e. 65535. which data type i can use in this code...

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Code C - [expand]
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#include<reg51.h>
sbit ip = P3^0;
 
void delay(unsigned int p)
{
 int i,j;
 for(i=0;i<p;i++)
 for(j=0;j<1250;j++);
}
 
void main()
{
 int val[]={0xc0,0xf9,0xa4,0xb0,0x91,0x92,0x82,0xf8,0x80,0x90};
 int a,b,c,d,e,br,cr,dr,er,x;
 a=0;
 while(1)
 {
 b=a/10000;
 br=a%10000;
 c=br/1000;
 cr=br%1000;
 d=cr/100;
 dr=cr%100;
 e=dr/10;
 er=dr%10;
 x=b;
 P1=0x80;
 P2=val[x];
 delay(10);
 x=c;
 P1=0x08;
 P2=val[x];
 delay(10);
 x=d;
 P1=0x04;
 P2=val[x];
 delay(10);
 x=e;
 P1=0x02;
 P2=val[x];
 delay(10);
 x=er;
 P1=0x01;
 P2=val[x];
 delay(10);
 while(ip==0);
 a=a+1;
 while(ip==1);
 }
 }

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here i want that variable "a" reach to 99999... if i change the data type to double then "br=b%10000" gives an error.

 

[FvM]

Sizes of data types are implementation dependend. People use to consult a compiler's user manual to know about the details. Most compilers (e.g. Keil C51) implement the type long with 32 bit size

 

[vinothksr08]

just mention it as long int.. then you can use

 

[Raady Here]

check the link
https://msdn.microsoft.com/en-us/library/s3f49ktz(v=vs.90).aspx

Study the table for different formats

 

[mathespbe]

i me counting something from 0 to 99999. here if i use an integer and increment it then it will reached its limit i.e. 65535. which data type i can use in this code...

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Code C - [expand]
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#include<reg51.h>
sbit ip = P3^0;
 
void delay(unsigned int p)
{
 int i,j;
 for(i=0;i<p;i++)
 for(j=0;j<1250;j++);
}
 
void main()
{
 int val[]={0xc0,0xf9,0xa4,0xb0,0x91,0x92,0x82,0xf8,0x80,0x90};
 int a,b,c,d,e,br,cr,dr,er,x;
 a=0;
 while(1)
 {
 b=a/10000;
 br=a%10000;
 c=br/1000;
 cr=br%1000;
 d=cr/100;
 dr=cr%100;
 e=dr/10;
 er=dr%10;
 x=b;
 P1=0x80;
 P2=val[x];
 delay(10);
 x=c;
 P1=0x08;
 P2=val[x];
 delay(10);
 x=d;
 P1=0x04;
 P2=val[x];
 delay(10);
 x=e;
 P1=0x02;
 P2=val[x];
 delay(10);
 x=er;
 P1=0x01;
 P2=val[x];
 delay(10);
 while(ip==0);
 a=a+1;
 while(ip==1);
 }
 }

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here i want that variable "a" reach to 99999... if i change the data type to double then "br=b%10000" gives an error.

for 16 bit compiler just assign as unsigned long int which 'll give you a range of 0 to 4294967296... For 32 bit compiler u can assign just as int to get the same range.

As you mention I guess you r using 16 bit compiler. So assign as unsigned long in...

 

[uday mehta]

i tried long int but first it reach to 65500 and then next time it reach to 35500(nearly). actually it is fast so i can't see exact value. but when i want to count from 00 to 999999 then it count 65500 then 35500 and add it. means whole program works fine but not display value from 65500 to 99999.