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要使用C语言实现复数的加减乘除，可以先定义一个结构体表示复数，然后编写相应的函数来进行运算。
以下是一个示例：
#include <stdio.h> // 定义复数结构体 typedef struct { double real; // 实部 double imaginary; // 虚部 } Complex; // 复数加法 Complex add(Complex a, Complex b) { Complex result; result.real = a.real + b.real; result.imaginary = a.imaginary + b.imaginary; return result; } // 复数减法 Complex subtract(Complex a, Complex b) { Complex result; result.real = a.real - b.real; result.imaginary = a.imaginary - b.imaginary; return result; } // 复数乘法 Complex multiply(Complex a, Complex b) { Complex result; result.real = a.real * b.real - a.imaginary * b.imaginary; result.imaginary = a.real * b.imaginary + a.imaginary * b.real; return result; } // 复数除法 Complex divide(Complex a, Complex b) { Complex result; double denominator = b.real * b.real + b.imaginary * b.imaginary; result.real = (a.real * b.real + a.imaginary * b.imaginary) / denominator; result.imaginary = (a.imaginary * b.real - a.real * b.imaginary) / denominator; return result; } // 测试函数 int main() { Complex a = {1.0, 2.0}; Complex b = {3.0, 4.0}; Complex sum = add(a, b); printf("Sum: %lf + %lfi\n", sum.real, sum.imaginary); Complex difference = subtract(a, b); printf("Difference: %lf + %lfi\n", difference.real, difference.imaginary); Complex product = multiply(a, b); printf("Product: %lf + %lfi\n", product.real, product.imaginary); Complex quotient = divide(a, b); printf("Quotient: %lf + %lfi\n", quotient.real, quotient.imaginary); return 0; } 这个示例中，我们使用了一个结构体来表示复数，包含了实部和虚部。然后，我们编写了四个函数来分别实现复数的加法、减法、乘法和除法。在主函数中，我们定义了两个复数a和b，并通过这四个函数进行了加减乘除运算，并打印了结果。
注意，这只是一个简单的示例，实际情况中可能需要更多的错误处理和边界情况的考虑。
