include<math.h> void main(){ struct _complex z; /*声明一个复数变量*/ //是_complex z.x=4.0; /*实部*/ z.y=5.0; /*虚部*/ printf("The absolute value of %.4f+%.4fi is %.4f\n",z.x,z.y,cabs(z)); //是z.x和z.y } ...