Can unsigned long int Reliably Store a Ten-Digit Number in C ?

Integers' Value Ranges in C

In C , the range of values that integer types can store depends on their size and whether they are signed or unsigned. For a 32-bit computer, the minimum ranges guaranteed by the C standard are:

• short int and int: -32,767 to 32,767
• unsigned short int and unsigned int: 0 to 65,535
• long int: -2,147,483,647 to 2,147,483,647
• unsigned long int: 0 to 4,294,967,295

Given these ranges, unsigned long int cannot reliably hold a ten-digit number (1,000,000,000 - 9,999,999,999) on a 32-bit computer.

However, for larger numbers, C99 and C 11 introduced the long long int type, which offers a wider range:

• long long int: -9,223,372,036,854,775,807 to 9,223,372,036,854,775,807
• unsigned long long int: 0 to 18,446,744,073,709,551,615

With these expanded ranges, unsigned long long int provides ample capacity to store a ten-digit number. It should be noted that long long int is not always supported by older compilers, so its availability should be verified before relying on it.

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