What is INT_MIN and INT_MAX in C/C++?

INT_MIN is a macro that expands to the smallest (most negative) value that can be stored in a variable of type int.

INT_MAX is a macro that expands to the largest (most positive) value that can be stored in an int.

On most processors INT_MIN == -INT_MAX - 1, i.e., there is one more negative number than positive number in the range of legal values.

For unsigned int, the corresponding values are 0 and UINT_MAX. Typically UINT_MAX == 2*INT_MAX+1.

There are similar constants for other numeric types in C. Be careful with floating-point values, though, as FLT_MIN is the smallest positive float value and DBL_MIN is the smallest positive double. Similarly FLT_MAX and DBL_MAX are the largest finite values that can be represented in a float or double, even though both types can usually represent infinity.