mirror of https://github.com/TheAlgorithms/C
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/**
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* @file
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* @brief Convert a positive integer to string (non-standard function)
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* representation.
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*/
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#include <assert.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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/**
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* Converts an integer value to a null-terminated string using the specified
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* base and stores the result in the array given by str parameter.
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* @param value Value to be converted to a string.
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* @param dest pointer to array in memory to store the resulting null-terminated
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* string.
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* @param base Numerical base used to represent the value as a string, between 2
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* and 16, where 10 means decimal base, 16 hexadecimal, 8 octal, and 2 binary.
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* @returns A pointer to the resulting null-terminated string, same as parameter
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* str.
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* @note The destination array must be pre-allocated by the calling function.
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*/
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char *int_to_string(uint16_t value, char *dest, int base)
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{
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const char hex_table[] = {'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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int len = 0;
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do
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{
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dest[len++] = hex_table[value % base];
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value /= base;
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} while (value != 0);
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/* reverse characters */
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for (int i = 0, limit = len / 2; i < limit; ++i)
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{
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char t = dest[i];
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dest[i] = dest[len - 1 - i];
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dest[len - 1 - i] = t;
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}
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dest[len] = '\0';
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return dest;
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}
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/** Test function
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* @returns `void`
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*/
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static void test()
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{
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const int MAX_SIZE = 100;
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char *str1 = (char *)calloc(sizeof(char), MAX_SIZE);
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char *str2 = (char *)calloc(sizeof(char), MAX_SIZE);
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for (int i = 1; i <= 100; ++i) /* test 100 random numbers */
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{
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/* Generate value from 0 to 100 */
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int value = rand() % 100;
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// assert(strcmp(itoa(value, str1, 2), int_to_string(value, str2, 2)) ==
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// 0);
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snprintf(str1, MAX_SIZE, "%o", value); //* standard C - to octal */
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assert(strcmp(str1, int_to_string(value, str2, 8)) == 0);
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snprintf(str1, MAX_SIZE, "%d", value); /* standard C - to decimal */
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assert(strcmp(str1, int_to_string(value, str2, 10)) == 0);
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snprintf(str1, MAX_SIZE, "%x", value); /* standard C - to hexadecimal */
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assert(strcmp(str1, int_to_string(value, str2, 16)) == 0);
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}
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free(str1);
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free(str2);
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}
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/** Driver Code */
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int main()
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{
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/* Intializes random number generator */
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srand(time(NULL));
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test();
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return 0;
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}
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