三进制转换十进制C语言的程序

在C语言中，将三进制数转换成十进制数通常可以利用循环和乘法运算来实现。下面是一个简单的示例程序，它接受用户输入的三进制字符串并计算其对应的十进制值：

#include <stdio.h>
#include <string.h>

// Function to convert a binary number represented as string to decimal
int ternaryToDecimal(char *ternaryNum) {
    int len = strlen(ternaryNum);
    int decimalValue = 0;
    int base = 1; // Since we are starting from rightmost digit

    for (int i = len - 1; i >= 0; i--) {
        if (ternaryNum[i] == '1') {
            decimalValue += base;
        } else if (ternaryNum[i] == '2') {
            decimalValue += 2 * base;
        } else if (ternaryNum[i] == '0') {
            // Do nothing, it's the place holder in ternary system
        } else {
            printf("Invalid input! Only '0', '1', and '2' allowed in ternary.\n");
            return -1;
        }
        base *= 3;
    }

    return decimalValue;
}

int main() {
    char ternary[100];
    printf("Enter a three-digit number in ternary format: ");
    fgets(ternary, sizeof(ternary), stdin);

    // Remove newline character at the end of input
    ternary[strcspn(ternary, "\n")] = '\0';

    int decimalResult = ternaryToDecimal(ternary);
    if (decimalResult != -1) {
        printf("The decimal equivalent is: %d\n", decimalResult);
    }

    return 0;
}