Kompleks - Not Yet

#include <stdio.h>
#include <conio.h>

struct kompleks {
    int r1, r2, i1, i2;
};

void jumlah(struct kompleks);
void kurang(struct kompleks);
void kali(struct kompleks);
void bagi(struct kompleks);

main() {
    struct kompleks x;
    int pil;

    puts("BILANGAN KOMPLEKS");
    puts("===============================================");
    printf("Contoh : 4 + 7i\n - 4 = real\n - 7i = imaginer\n");
    puts("-----------------------------------------------");
    printf("Masukkan real 1 kompleks 1     : "); scanf("%d", &x.r1);
    printf("Masukkan imaginer 1 kompleks 1 : "); scanf("%d", &x.i1);
    printf("Masukkan real 2 kompleks 2     : "); scanf("%d", &x.r2);
    printf("Masukkan imaginer 2 kompleks 2 : "); scanf("%d", &x.i2);
    puts("-----------------------------------------------");
    do {
        printf("Pilihan menu\n");
        printf("1. Jumlah\n");
        printf("2. Kurang\n");
        printf("3. Kali\n");
        printf("4. Bagi\n");
        printf("0. Keluar\n");
        printf("Masukkan pilihan Anda : "); scanf("%d", &pil);
        puts("-----------------------------------------------");

        switch(pil) {
            case 1 : jumlah(x); break;
            case 2 : kurang(x); break;
            case 3 : kali(x); break;
            case 4 : bagi(x); break;
        }
        puts("-----------------------------------------------");
    }while(pil);

    //printf("1. real = %d imaginer = %d\n", x.a[0], x.a[1]);
    getch();
    return 0;
}
void jumlah(struct kompleks a) {
    struct kompleks c;
    c.r1 = a.r1 + a.r2;
    c.i1 = a.i1 + a.i2;

    printf("Penjumlahan\n");
    printf("(%d + %di) + (%d + %di) = %d + %di\n", a.r1, a.i1, a.r2, a.i2, c.r1, c.i1);
}
void kurang(struct kompleks a) {
    struct kompleks c;
    c.r1 = a.r1 - a.r2;
    c.i1 = a.i1 - a.i2;

    printf("Pengurangan\n");
    printf("(%d + %di) - (%d + %di) = %d + %di\n", a.r1, a.i1, a.r2, a.i2, c.r1, c.i1);
}
void kali(struct kompleks a) {
    struct kompleks c;
    int g,h,j,k;

    g = a.r1 * a.r2;
    h = a.r1 * a.i2;
    j = a.r2 * a.i1;
    k = a.i1 * a.i2;

    c.r1 = (a.r1 * a.r2) - (a.i1 * a.i2);
    c.i1 = (a.r1 * a.i2) + (a.r2 * a.i1);

    printf("Perkalian\n");
    printf("(%d + %di) * (%d + %di)  = %d + %di + %di + %di%c\n", a.r1, a.i1, a.r2, a.i2, g, h, j, k, 253);
    printf("karena i%c = -1 maka  = %d + %di + %di - %d\n", 253, g, h, j, k);
    printf("\t\t     = %d + %di\n", c.r1, c.i1);
}
void bagi(struct kompleks a) {
    struct kompleks c;
    int g,h,j,k;

    g = a.r1 * a.r2;
    h = a.r1 * a.i2;
    j = a.r2 * a.i1;
    k = a.i1 * a.i2;

    c.r1 = (a.r1 * a.r2) - (a.i1 * a.i2);
    c.i1 = (a.r1 * a.i2) + (a.r2 * a.i1);

    printf("Pembagian\n");
    //printf("(%d + %di) * (%d + %di)  = %d + %di + %di + %di%c\n", a.r1, a.i1, a.r2, a.i2, g, h, j, k, 253);
    printf("%d + %di\n", a.r1, a.i1);
    printf("%c%c%c%c%c%c = \n", 196, 196, 196, 196, 196, 196);
    printf("%d + %di\n", a.r2, a.i2);

    printf("%d + %di %3d - %di\n", a.r1, a.i1, a.r2, a.i2);
    printf("%c%c%c%c%c%c x %c%c%c%c%c%c\n", 196, 196, 196, 196, 196, 196, 196, 196, 196, 196, 196, 196);
    printf("%d + %di %3d - %di\n", a.r2, a.i2, a.r2, a.i2);
    //printf("karena i%c = -1 maka  = %d + %di + %di - %d\n", 253, g, h, j, k);
    //printf("\t\t     = %d + %di\n", c.r1, c.i1);
}