用c语言编写一个计算器且可以开根号和三角函数的运算

好的，以下是一个简单的用C语言编写的计算器，包括开根号和三角函数的运算：

#include <stdio.h>
#include <math.h>

int main() {
    char operator;
    double num1, num2, result;

    printf("Enter operator (+, -, *, /, sqrt, sin, cos, tan): ");
    scanf("%c", &operator);

    switch (operator) {
        case '+':
            printf("Enter two numbers: ");
            scanf("%lf %lf", &num1, &num2);
            result = num1 + num2;
            printf("Result: %lf", result);
            break;
        case '-':
            printf("Enter two numbers: ");
            scanf("%lf %lf", &num1, &num2);
            result = num1 - num2;
            printf("Result: %lf", result);
            break;
        case '*':
            printf("Enter two numbers: ");
            scanf("%lf %lf", &num1, &num2);
            result = num1 * num2;
            printf("Result: %lf", result);
            break;
        case '/':
            printf("Enter two numbers: ");
            scanf("%lf %lf", &num1, &num2);
            result = num1 / num2;
            printf("Result: %lf", result);
            break;
        case 's':
            printf("Enter a number: ");
            scanf("%lf", &num1);
            result = sqrt(num1);
            printf("Result: %lf", result);
            break;
        case 'c':
            printf("Enter a number: ");
            scanf("%lf", &num1);
            result = cos(num1);
            printf("Result: %lf", result);
            break;
        case 't':
            printf("Enter a number: ");
            scanf("%lf", &num1);
            result = tan(num1);
            printf("Result: %lf", result);
            break;
        default:
            printf("Error! Invalid operator");
            break;
    }

    return 0;
}

该计算器可以接受用户输入的运算符，包括加减乘除、平方根、正弦、余弦和正切，并输出相应的结果。