mirror of https://github.com/TheAlgorithms/C
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/**
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* @file
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* @brief Octal to hexadecimal conversion by scanning user input
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* @details
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* The octalToHexadecimal function take the octal number as long
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* return a string hexadecimal value after conversion
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* @author [Rachit Bhalla](https://github.com/rachitbhalla)
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*/
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#include <assert.h> // for assert
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#include <math.h> // for pow function
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#include <stdio.h> // for scanf and printf functions
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#include <stdlib.h> // for malloc and free functions
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#include <string.h> // for strcmp function
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/**
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* @brief Convert octal number to decimal number
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* @param octalValue is the octal number that needs to be converted
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* @returns a decimal number after conversion
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*/
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long octalToDecimal(long octalValue){
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long decimalValue = 0;
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int i = 0;
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while (octalValue) {
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// Extracts right-most digit, multiplies it with 8^i, and increment i by 1
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decimalValue += (long)(octalValue % 10) * pow(8, i++);
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// Shift right in base 10
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octalValue /= 10;
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}
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return decimalValue;
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}
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/**
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* @brief Convert octal number to hexadecimal number
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* dynamically allocated memory needs to be freed by the calling the function free
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* @param octalValue is the octal number that needs to be converted
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* @returns a hexadecimal value as a string after conversion
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*/
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char *octalToHexadecimal(long octalValue){
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char *hexadecimalValue = malloc(256 * sizeof(char));
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sprintf(hexadecimalValue, "%lX", octalToDecimal(octalValue));
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return hexadecimalValue;
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}
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/**
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* @brief Test function
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* @returns void
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*/
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static void test() {
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/* test that hexadecimal value of octal number 213 is 8B */
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assert(strcmp(octalToHexadecimal(213), "8B") == 0);
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/* test that hexadecimal value of octal number 174 is 7C */
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assert(strcmp(octalToHexadecimal(174), "7C") == 0);
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}
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/**
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* @brief Main function
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* @returns 0 on exit
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*/
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int main()
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{
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// execute the tests
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test();
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// get the value of octal number as input
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int octalValue;
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printf("Enter an octal number: ");
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scanf("%d", &octalValue);
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// call the function octalToHexadecimal and print the hexadecimal value
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char *hexadecimalValue = octalToHexadecimal(octalValue);
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printf("Equivalent hexadecimal number is: %s", hexadecimalValue);
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// free the memory allocated dynamically in function octalToHexadecimal
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free(hexadecimalValue);
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// return 0 and exit
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return 0;
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}
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