#include <stdio.h>

/**
 * A Complex number consisting of real and imaginary part
 */
struct complex_number {
    int real;   /**< real part of complex number */
    int imag;   /**< imaginary part of complex number */
};

/**
 * read a complex number from command line
 *
 * @returns the compex number from command line
 */
struct complex_number read_complex_number();

/**
 * print a complex number to command line
 *
 * @param number the complex number to print
 */
void print_complex_number(struct complex_number number);

int main(void) {
    struct complex_number number;
    number = read_complex_number();
    print_complex_number(number);

    return 0;
}

struct complex_number read_complex_number() {
    struct complex_number number;
    printf("please input a complex number in form a+bi: ");
    char buf[256] = {0};
    fgets(buf, sizeof(buf) / sizeof(buf[0]), stdin);
    sscanf(buf, "%d+%di", &number.real, &number.imag);
    return number;
}

void print_complex_number(struct complex_number number) {
    printf("%d+%di\n", number.real, number.imag);
}