已经审查了几个答案，但仍然没有在 C 中获得权力 [重复]

Question

我已经查看了多个 C 中的权力问题和答案，或4^2。我已经用不同的方式写出来了，但仍然不能正确。截至目前，我收到消息：

/tmp/cc9yBiPo.o: In function `main':
Functions2.c:(.text+0x2b8): undefined reference to `pow'
collect2: error: ld returned 1 exit status.

到目前为止，这是我的代码，就像我说的我尝试了不同的人的答案，但我比什么都更困惑。

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


int main()

{

int choice;
int a, b, c;
float d;


    do{
    printf("\t Menu \n");
    printf("1. Addition \n");
    printf("2. Subtraction \n");
    printf("3. Multiplication \n");
    printf("4. Division \n");
    printf("5. Modulo \n");
    printf("6. Eponents \n");
    printf("7. Exit \n");

    printf("Please choose a menu selection: \n");
    scanf("%d", &choice);

    switch(choice)
    {
    case 1:
    {
        printf("Enter two numbers to add: \n");
        scanf("%d%d", &a, &b);

        c = a + b;

        printf("The sum of the two numbers = %d \n", c);

    }break;

    case 2:
    {
        printf("Enter two numbers to subtract: \n");
        scanf("%d&d", &a, &b);

        c = a - b;

        printf("The difference between the two number = %d \n", c);

    }break;

    case 3:
    {
        printf("Enter two numbers to multiply: \n");
        scanf("%d%d", &a, &b);

        c = a * b;

        printf("The product of the two numbers = %d \n", c);
    }break;

    case 4:
    {
        printf("Enter two numbers to divide: \n");
        scanf("%d%d", &a, &b);

        d = (float) a/b;

        printf("The quotient of the two numbers = %f \n", d);

    }break;

    case 5:
    {
        printf("Enter two numbers to get a modulo: \n");
        scanf("%d%d", &a, &b);

        c = a % b;

        printf("The modulus of the two numbers = %d \n", c);
    }break;

    case 6:
    {
        printf("Enter a base: \n");
        scanf("%d", &a);

        printf("Enter an exponent: \n");
        scanf("%d", &b);

        c = pow(a, b);

        printf("The exponent of the two numbers = %d", c);
    }break;

    case 7:
    {
        printf("Thank you, you will now exit.");
    }break;

    default:
        printf("error \n");
    }
}   while (choice != 7);

return 0;
}

Answer 1

你必须链接到数学库(libm)。

将-lm 标志添加到您的复杂命令以与其链接。

检查这个question。

Answer 2

您必须更改基数和指数的数据类型才能获得正确的结果。

C语言中pow函数的语法是：

双 pow(双 x, 双 y);

同样，在 4 的情况下，将数据类型从 int 更改为 float。

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


int main()

{

   double g,h,i;
   int choice;
   int a, b, c;
   float d,e,f;


   do{
        printf("\t Menu \n");
        printf("1. Addition \n");
        printf("2. Subtraction \n");
        printf("3. Multiplication \n");
        printf("4. Division \n");
        printf("5. Modulo \n");
        printf("6. Eponents \n");
        printf("7. Exit \n");

        printf("Please choose a menu selection: \n");
        scanf("%d", &choice);

        switch(choice)
         {
          case 1:
             {
                printf("Enter two numbers to add: \n");
                scanf("%d%d", &a, &b);

                c = a + b;

                printf("The sum of the two numbers = %d \n", c);

             }break;

         case 2:
             {
                printf("Enter two numbers to subtract: \n");
                scanf("%d&d", &a, &b);

                c = a - b;

                printf("The difference between the two number = %d \n", c);

             }break;

         case 3:
             {
               printf("Enter two numbers to multiply: \n");
               scanf("%d%d", &a, &b);

               c = a * b;

               printf("The product of the two numbers = %d \n", c);
             }break;

         case 4:
             {
               printf("Enter two numbers to divide: \n");
               scanf("%f%f", &e, &f);

               d = e/f;

               printf("The quotient of the two numbers = %f \n", d);

             }break;

         case 5:
              {
               printf("Enter two numbers to get a modulo: \n");
               scanf("%d%d", &a, &b);

               c = a % b;

               printf("The modulus of the two numbers = %d \n", c);
              }break;

          case 6:
              {
               printf("Enter a base: \n");
               scanf("%lf", &h);

               printf("Enter an exponent: \n");
               scanf("%lf", &i);

               g = pow(h, i);

               printf("The exponent of the two numbers = %lf", g);
              }break;

         case 7:
              {
               printf("Thank you, you will now exit.");
              }break;

        default:
               printf("error \n");
              }
              }   while (choice != 7);



        return 0;
              }

希望这会对你有所帮助。