/* Program 2.17 Working with complex numbers*/

#include <stdio.h>
#include <complex.h>


int main(void)
{
    double complex cx=1.0+3.0*I;
    double complex cy=1.0-4.0*I;

    printf("Working with complex numbers:");
    printf("\nStarting values: cx=%.2f%+.2fi cy=%.2f%+.2fi",
              creal(cx),cimag(cx),creal(cy),cimag(cy));

    double complex sum=cx+cy;
    printf("\n\nThe sum cx+cy=%.2f%+.2fi",
                creal(sum),cimag(sum));
    double complex difference=cx-cy;
    printf("\n\nThe difference cx-cy=%.2f%+.2fi ",
                creal(difference),cimag(difference));

    double complex product=cx*cy;
    printf("\n\nThe product cx*cy=%.2f%+.2fi",
        creal(product),cimag(product));

    double complex quotient=cx/cy;
    printf("\n\nThe quotient cx/cy=%.2f+%.2fi",
             creal(quoient),cimag(quotient));

    double complex conjugate=conj(cx);
    printf("\n\n The conjugate of cx =%.2f%+.2fi",
                 creal(conjugate),cimag(conjugate));
    return 0;
}

double complex ？？？
如果你想用complex来定义double类型，你应该用typedef声明或者用#define声明啊

除了quoient应该是quotient之外，没有语法错误。

你说“总提示没有complex，film”，你总得告诉别人你用的是什么编译器吧，它支持不支持当今的C语言？如果支持，是不是需要什么设置？

没啥问题，除了楼上说的 quotient 这个变量拼错了之外~~~