C programming

[ChatIndia]

#include <stdio.h>
main()
{
int r,s;
printf("Enter Roll Number\n");
scanf("%d",&r);
printf("Enter Serial Number\n");
scanf("%d",&s);
system("clear");
printf("%d\n",r);
printf("%d\n",s);
}

When I enter Roll No = 3332810074 and Serial Number = 14 the output roll number is wrong and the output serial number is right. Can you help me to detect the error.

 

[descalzo]

if int ---> unsigned int ---> max value 2147483647 ...

 

[ChatIndia]

so what should i use for a number up to 4000000000

 

[descalzo]

Assuming you are only going to have positive numbers, unsigned int should work.

 

[LostHorizon]

For your information:

• short, unsigned short -- 2 bytes
• int, unsigned int -- 4 bytes
• long, unsigned long -- 4 bytes

(http://msdn.microsoft.com/en-us/library/9c3yd98k(v=VS.71).aspx)


NOTES:

1. The maximum value of any UNSIGNED integer type = (2 ^ number of storage bits) - 1. Hence:
   
   • the maximum value of unsigned short = (2 ^ 16) - 1 = 65,535 (0xFFFF),
   • the maximum value of unsigned int & unsigned long = (2 ^ 32) - 1 = 4,294,967,295 (0xFFFFFFFF).
   
   
2. Also, the maximum value of any SIGNED integer type = (2 ^ (number of storage bits - 1)) - 1. Hence:
   
   • the maximum value of signed short = (2 ^ 15) - 1 = 32,767,
   • the maximum value of signed int & signed long = (2 ^ 31) - 1 = 2,147,483,647.

Hope this helps.

 

[misson]

• long, unsigned long -- 4 bytes

That's only to be expected on a 32-bit machine, or when using a Microsoft compiler. For example, a long on a 64-bit machine running Linux in a program compiled in 64 bit mode will use 8 bytes. To get the minimum and maximum integer values on a system, consult limits.h.