题目：

题解：

bool parseComplexNumber(const char * num, int * real, int * image) {char *token = strtok(num, "+");*real = atoi(token);token = strtok(NULL, "i");*image = atoi(token);return true;
};char * complexNumberMultiply(char * num1, char * num2){int real1 = 0, imag1 = 0;int real2 = 0, imag2 = 0;char * res = (char *)malloc(sizeof(char) * 20);parseComplexNumber(num1, &real1, &imag1);parseComplexNumber(num2, &real2, &imag2);snprintf(res, 20, "%d+%di", real1 * real2 - imag1 * imag2, real1 * imag2 + imag1 * real2);return res;
}