Convert string to integer in perl12/7/2023 ![]() ![]() ![]() The above sentence expresses this condition on one line. Then it must be an integer greater than or equal to 2 and less than or equal to 16. $n supports binary to hexadecimal numbers.įirst, $n must be passed as an argument. ![]() The return value returns the corresponding decimal number if it can be converted, and undef if it cannot be converted. The first argument is an n-ary string, and the second argument is a number that specifies the number to convert from base to decimal. Subroutine specifications for converting n-ary to decimal # From here is the main process of base conversion # Checking the validity of $num_str (including checking the consistency with $n) My ($num_str, $n) = Checking the validity of $n # Convert n-ary to decimal (up to hexadecimal) In this example, the validity check of the argument is about 3 times as much as this process, but it is common that there are more error processing descriptions than this process. Since the algorithm for converting from n-ary to decimal is simple, I also checked the validity of the arguments properly. This is an example to convert from n-ary to decimal. The converted array and the code saved in $sign are combined with the join function to form a single string.Īlgorithm for converting from n - ary to decimal is an array for conversion.Ĭonvert each element of to $dec_to_n with the map function. Return join('', $sign, map example, for hexadecimal numbers, you need to convert 11 to 15 to A to F. # Convert in conversion table and join characters # A table to convert to a base number representation. My ($dec, $n) = Checking the validity of $n # Convert decimal to n (up to hexadecimal) I also checked the validity of the arguments properly. This is an example to convert from decimal to n-ary. Print "Hexadecimal to Decimal Conversion\n" Īlgorithm for converting decimal to n - ary # Convert an octal string to a decimal number with the hex function. # Convert an octal string to a decimal number with the oct function. # Convert a binary string to a decimal number with the oct function. This is an example to convert binary, octal, and hexadecimal numbers to decimal numbers. In the example, 'FF' is passed as an argument, but even if 0x is added at the beginning like '0xFF', it will be converted correctly. Use hex function to convert from hexadecimal to decimal. In the example, '17' is passed, but even if there is a leading 0 like '017', it will be converted correctly. Use oct function to convert from octal to decimal. ![]() The oct function is originally a function that converts an octal number to a decimal number, but if a string prefixed with 0b is passed as an argument, the binary number is converted to a decimal number. Use oct function to convert from binary to decimal. I will explain the conversion from binary numbers, octal numbers, and hexadecimal numbers to decimal numbers. Print "(1) Conversion from decimal string to 2,8, hexadecimal string\n" īinary, Octal, Hexadecimal to Decimal Conversion If you use sprintf, you can get the string output by the printf function as the return value.īelow is an example conversion to binary, octal, and hexadecimal numbers. The sprintf function is a common function of printf function. To convert to octal and hexadecimal, use "%o" and "%X" respectively. To convert a decimal string to a binary number, use the sprintf function to specify the format as "%b". Use the format specification in sprintf function. Let's convert from decimal to binary, octal, and hexadecimal. Conversion from decimal to binary, octal, hexadecimal ![]()
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