C program to show the range of various data types

We can determine the minimum and maximum possible of values of data types in C by using predefined constants in a program. Here is the code for displaying the ranges of various data types in C:

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#include <stdio.h> #include <limits.h> #include <float.h>   int main() {       printf("CHAR_BIT      :   %d\n", CHAR_BIT);     printf("CHAR_MAX      :   %d\n", CHAR_MAX);     printf("CHAR_MIN      :   %d\n", CHAR_MIN);     printf("\n");     printf("INT_MAX       :   %d\n", INT_MAX);     printf("INT_MIN       :   %d\n", INT_MIN);     printf("\n");     printf("SHRT_MAX      :   %d\n", SHRT_MAX);     printf("SHRT_MIN      :   %d\n", SHRT_MIN);     printf("\n");     printf("LONG_MAX      :   %ld\n", (long) LONG_MAX);     printf("LONG_MIN      :   %ld\n", (long) LONG_MIN);     printf("\n");     printf("LLONG_MAX     :   %lld\n", (long long) LLONG_MAX);     printf("LLONG_MIN     :   %lld\n", (long long) LLONG_MIN);     printf("\n");     printf("SCHAR_MAX     :   %d\n", SCHAR_MAX);     printf("SCHAR_MIN     :   %d\n", SCHAR_MIN);     printf("\n");     printf("UCHAR_MAX     :   %d\n", UCHAR_MAX);     printf("UINT_MAX      :   %u\n", (unsigned int) UINT_MAX);     printf("ULONG_MAX     :   %lu\n", (unsigned long) ULONG_MAX);     printf("USHRT_MAX     :   %d\n", (unsigned short) USHRT_MAX);     printf("\n");     printf("FLT_MAX       :   %g\n", (float) FLT_MAX);     printf("FLT_MIN       :   %g\n", (float) FLT_MIN);     printf("-FLT_MAX      :   %g\n", (float) -FLT_MAX);     printf("-FLT_MIN      :   %g\n", (float) -FLT_MIN);     printf("\n");     printf("DBL_MAX       :   %g\n", (double) DBL_MAX);     printf("DBL_MIN       :   %g\n", (double) DBL_MIN);     printf("-DBL_MAX      :   %g\n", (double) -DBL_MAX);     printf("-DBL_MIN      :   %g\n", (double) -DBL_MIN);       return 0; }

Output of above program on Ideone compiler is:

CHAR_BIT      :   8
CHAR_MAX      :   127
CHAR_MIN      :   -128

INT_MAX       :   2147483647
INT_MIN       :   -2147483648

SHRT_MAX      :   32767
SHRT_MIN      :   -32768

LONG_MAX      :   2147483647
LONG_MIN      :   -2147483648

LLONG_MAX     :   9223372036854775807
LLONG_MIN     :   -9223372036854775808

SCHAR_MAX     :   127
SCHAR_MIN     :   -128

UCHAR_MAX     :   255
UINT_MAX      :   4294967295
ULONG_MAX     :   4294967295
USHRT_MAX     :   65535

FLT_MAX       :   3.40282e+38
FLT_MIN       :   1.17549e-38
-FLT_MAX      :   -3.40282e+38
-FLT_MIN      :   -1.17549e-38

DBL_MAX       :   1.79769e+308
DBL_MIN       :   2.22507e-308
-DBL_MAX      :   -1.79769e+308
-DBL_MIN      :   -2.22507e-308

Explanation:
The header file limits.h defines the following constants:

• CHAR_BIT = number of bits in a char
• SCHAR_MIN = minimum value for a signed char
• SCHAR_MAX = maximum value for a signed char
• UCHAR_MAX = maximum value for an unsigned char
• CHAR_MIN = minimum value for a char
• CHAR_MAX = maximum value for a char
• MB_LEN_MAX = maximum multibyte length of a character accross locales
• SHRT_MIN = minimum value for a short
• SHRT_MAX = maximum value for a short
• USHRT_MAX = maximum value for an unsigned short
• INT_MIN = minimum value for an int
• INT_MAX = maximum value for an int
• UINT_MAX = maximum value for an unsigned int
• LONG_MIN = minimum value for a long
• LONG_MAX = maximum value for a long
• ULONG_MAX = maximum value for an unsigned long
• LLONG_MIN = minimum value for a long long
• LLONG_MAX = maximum value for a long long
• ULLONG_MAX = maximum value for an unsigned long long
  
  (Here U*_MIN constants are omitted as any unsigned type has a minimum value of 0.)

Similarly float.h provides limits for float and double types:

• FLT_MIN = min value of a float
• FLT_MAX = max value of a float
• DBL_MIN = min value of a double
• DBL_MAX = max value of a double
• LDBL_MIN = min value of a long double
• LDBL_MAX = max value of a long double