limits.h in C

limits.h:

• It is pre-defined header file.
• This header file contains set of variables
  • INT_MIN
  • INT_MAX
  • UINT_MIN
  • SHRT_MIN
  • SHRT_MAX
  • USHART_MAX
  • SCHAR_MIN
  • SCHAR_MAX
  • UCHAR_MAX
• These variables holding some values.
• These variables represent the minimum and maximum limits of each data type.

Displaying signed character limits:

#include <stdio.h>
#include <limits.h>
int main()
{
	printf("signed char min val : %d \n", SCHAR_MIN);
	printf("signed char max val : %d \n", SCHAR_MAX);
	return 0;
}

Output:
signed char min val : -128
signed char max val : 127

Displaying unsigned character limits:

• Limits.h header file is not providing the variable to print minimum value of unsigned type.
• For example
  • UCHAR_MIN
  • USHRT_MIN
  • UINT_MIN
  • ULONG_MIN
• The reason – minimum value of unsigned type starts with 0 ; Hence we can remember easily.
• It is providing only maximum limit.

#include <stdio.h>
#include <limits.h>
int main()
{
	/* printf("unsigned char min val : %d \n", UCHAR_MIN);  --> Error : */  
	printf("unsigned char max val : %d \n", UCHAR_MAX);
	return 0;
}

Output:
unsigned char max val : 255