Hope that following will be useful ...
signed char: -127 to 127 (note, not -128 to 127; this accommodates 1's-complement platforms)
unsigned char: 0 to 255
"plain" char: -127 to 127 or 0 to 255 (depends on default char signedness)
signed short: -32767 to 32767
unsigned short: 0 to 65535
signed int: -32767 to 32767
unsigned int: 0 to 65535
signed long: -2147483647 to 2147483647
unsigned long: 0 to 4294967295
signed long long: -9223372036854775807 to 9223372036854775807
unsigned long long: 0 to 18446744073709551615
Or you can use limit.h to find out around what your program relies on.
For example, this is how you will find maximum range for int:
C:
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#include <limits.h>
const int min_int = INT_MIN;
const int max_int = INT_MAX;
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C++:
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#include <limits>
const int min_int = std::numeric_limits<int>::min();
const int max_int = std::numeric_limits<int>::max();
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