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Integer*4 is a data type used in Fortran77 to represent integer numbers with a maximum size of 4 bytes or 32 bits. This means that the largest integer value that can be stored in an integer*4 variable is 2^31 - 1 or 2,147,483,647.
In Fortran77, integer*4 is the default integer data type. This means that if a variable is not explicitly declared as a different integer data type, it will be automatically assumed to be an integer*4. Other integer data types, such as integer*2 or integer*8, have different maximum values and require more or less memory space.
Integer*4 is commonly used in Fortran77 because it provides a balance between precision and memory usage. It is suitable for most basic arithmetic operations and can represent a wide range of integer values without requiring excessive memory space.
Yes, integer*4 can store both positive and negative numbers. The first bit in an integer*4 variable is used to represent the sign (0 for positive, 1 for negative) and the remaining 31 bits are used to represent the magnitude of the number.
One limitation of using integer*4 in Fortran77 is that it cannot accurately represent numbers larger than 2,147,483,647 or smaller than -2,147,483,648. This can be an issue when dealing with very large or very small numbers in scientific or mathematical calculations. In these cases, a different data type with a larger range may be necessary.