buat sugab

#include <stdio.h>
#include <windows.h>
#include <conio.h>
#define MAX 32

char kode_mk[MAX], nama_mk[MAX], optt, rcall;
int no_k, sks, total_sks;
float ips, nilai, mutu, total_mk, total_bobot;

int main()
{
    input_data();
    system("cls");
    printf("Total SKS                       = %d", total_sks);
    printf("\nTotal Bobot                     = %.2f", total_bobot);
    ips=total_bobot/total_sks;
    printf("\nIndeks Prestasi Semester (IPS)  = %.2f", ips);
    return 0;
}
void input_data()
{
    system("cls");
    fflush(stdin);
    fflush(stdout);
    printf("Mata kuliah ke-%d \n", no_k);
    printf("----------------------------------------------------------\n");
    printf("Kode Mata Kuliah : "); fgets(kode_mk, MAX, stdin);
    printf("Nama Mata Kuliah : "); fgets(nama_mk, MAX, stdin);
    printf("SKS              : "); scanf("%d", &sks);
    hitung_sks();
    printf("Nilai            : "); scanf("%f", &nilai);
    hitung_mutu();
    total_mk = mutu * sks;
    printf("SKS * Mutu       : %.2f \n", total_mk);
    printf("----------------------------------------------------------\n");
    opt();
    opt2();
}
void hitung_sks()
{
    if(sks <= 6 && sks > 0)
            {}
        else
        {
            system("cls");
            printf("Masukkan data yang valid!");
            Sleep(3200);
            no_k--;
        }
}
void hitung_mutu()
{
    if(nilai >= 90.00 && nilai <= 100.00)
        mutu = 4;
    else if (nilai >= 80.00 && nilai <= 89.99)
        mutu = 3.7;
    else if (nilai >= 75.00 && nilai <= 79.99)
        mutu = 3.3;
    else if (nilai >= 70.00 && nilai <= 74.99)
        mutu = 3;
    else if (nilai >= 65.00 && nilai <= 69.99)
        mutu = 2.7;
    else if (nilai >= 60.00 && nilai <= 64.99)
        mutu = 2.3;
    else if (nilai >= 55.00 && nilai <= 59.99)
        mutu = 2;
    else if (nilai >= 50.00 && nilai <= 54.99)
        mutu = 1.7;
    else if (nilai >= 40.00 && nilai <= 49.99)
        mutu = 1;
    else if (nilai <= 40.00 && nilai >= 0.00)
        mutu = 0;
    else
        {
            system("cls");
            printf("Masukkan data yang valid!");
            Sleep(3200);
            no_k--;
        }
}
void opt()
{
    printf("Apakah data yang anda masukkan sudah benar [Y/T]? "); scanf("%s", &rcall);
        if(rcall == 'Y' || rcall == 'y')
                {
                    total_bobot=total_bobot+total_mk;
                    total_sks=total_sks+sks;
                }
            else if(rcall == 'T' || rcall == 't')
                {
                    no_k--;
                }
            else
                printf("Masukkan data yang valid!\n");
}
void opt2()
{
    printf("Tambahkan data lagi [Y/T]? "); scanf("%s", &optt);
        if(optt == 'Y' || optt == 'y')
            {}
        else if(optt == 'T' || optt == 't')
            {}
        else
            {
                printf("Masukkan data yang valid!\n");
            }
}