使用 C++ 在十进制和其他基数之间相互转换
在本教程中,我们将讨论一个程序,它可以将任意进制转换为十进制,反之亦然。
为此,我们将提供一个整数及其进制。我们的任务是将该数转换为其十进制等价物。此外,我们还将执行此过程的逆过程。
示例
#include <stdio.h> #include <string.h> //returning values of a character int val(char c) { if (c >= '0' && c <= '9') return (int)c - '0'; else return (int)c - 'A' + 10; } //converting number to decimal equivalent int convert_decimal(char *str, int base) { int len = strlen(str); int power = 1; int num = 0; int i; for (i = len - 1; i >= 0; i--) { if (val(str[i]) >= base) { printf("Invalid Number"); return -1; } num += val(str[i]) * power; power = power * base; } return num; } int main() { char str[] = "11A"; int base = 16; printf("Decimal equivalent of %s in base %d is " " %d\n", str, base, convert_decimal(str, base)); return 0; }
输出
Decimal equivalent of 11A in base 16 is 282
现在执行相反的操作。
示例
#include <stdio.h> #include <string.h> //returning values of a character char reVal(int num) { if (num <= 0 && num >= 9) return (char)(num + '0'); else return (char)(num - 10 + 'A'); } //reversing a given string void reverse_string(char *str) { int len = strlen(str); int i; for (i = 0; i < len/2; i++) { char temp = str[i]; str[i] = str[len-i-1]; str[len-i-1] = temp; } } //converting to equivalent number with base 'b' char* convert_base(char res[], int base, int inputNum) { int index = 0; while (inputNum > 0) { res[index++] = reVal(inputNum % base); inputNum /= base; } res[index] = '\0'; //reversing the result reverse_string(res); return res; } int main() { int inputNum = 282, base = 16; char res[100]; printf("Equivalent of %d in base %d is "" %s\n", inputNum, base, convert_base(res, base, inputNum)); return 0; }
输出
Equivalent of 282 in base 16 is 11A
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