用c语言编程一个简单计算器，可以有多个数加分，减法，乘法，除法，阶乘等运算

好的，以下是 C 语言的实现示例：

#include <stdio.h>

int add(int *nums, int n) {
    int sum = 0;
    for (int i = 0; i < n; i++) {
        sum += nums[i];
    }
    return sum;
}

int subtract(int *nums, int n) {
    int result = nums[0];
    for (int i = 1; i < n; i++) {
        result -= nums[i];
    }
    return result;
}

int multiply(int *nums, int n) {
    int result = 1;
    for (int i = 0; i < n; i++) {
        result *= nums[i];
    }
    return result;
}

float divide(int *nums, int n) {
    int divisor = nums[0];
    for (int i = 1; i < n; i++) {
        if (nums[i] == 0) {
            printf("Error: Division by zero is not allowed\n");
            return 0;
        } else {
            divisor /= nums[i];
        }
    }
    return (float)divisor;
}

int factorial(int x) {
    if (x < 0) {
        printf("Error: Factorial of a negative number is not defined\n");
        return 0;
    } else if (x == 0) {
        return 1;
    } else {
        return x * factorial(x-1);
    }
}

int main() {
    int choice, n;
    int nums[10];

    while (1) {
        printf("\nSelect operation.\n");
        printf("1.Add\n");
        printf("2.Subtract\n");
        printf("3.Multiply\n");
        printf("4.Divide\n");
        printf("5.Factorial\n");
        printf("6.Quit\n");

        scanf("%d", &choice);

        if (choice == 6) {
            break;
        }

        printf("Enter number of operands: ");
        scanf("%d", &n);

        if (n > 10) {
            printf("Error: Maximum number of operands is 10\n");
            continue;
        }

        printf("Enter %d operands: ", n);
        for (int i = 0; i < n; i++) {
            scanf("%d", &nums[i]);
        }

        switch (choice) {
            case 1:
                printf("Result: %d\n", add(nums, n));
                break;
            case 2:
                printf("Result: %d\n", subtract(nums, n));
                break;
            case 3:
                printf("Result: %d\n", multiply(nums, n));
                break;
            case 4:
                printf("Result: %.2f\n", divide(nums, n));
                break;
            case 5:
                printf("Result: %d\n", factorial(nums[0]));
                break;
            default:
                printf("Invalid Input\n");
        }
    }

    printf("Goodbye!\n");

    return 0;
}

这个程序会循环显示菜单，用户可以输入多个操作数，根据用户的选择进行不同的计算操作，使用了函数来实现每种运算，同时还有对除零和负数阶乘的错误处理。注意输出浮点数除法结果时使用了 `%.2f` 格式化字符串控制输出精度。用户可以选择退出程序。