c labsi 2

#include <stdio.h>
main()
{
    int pil, npm;
    float uts, uas, r, t, lp;
    char nd[25], np[25], kelas[10];

    printf("---MENU---\n");
    printf("1. Biodata\n");
    printf("2. Nilai\n");
    printf("3. Luas Permukaan Tabung\n");
    printf("4. Exit\n");
    printf("Masukan pilihan anda : ");
    scanf("%d", &pil);

    switch(pil)
    {
        case 1:
            printf("\n---BIODATA---\n");
            printf("Nama Lengkap\t: ");
            scanf("%s %s", &nd, &np);
            printf("NPM\t\t: ");
            scanf("%d", &npm);
            printf("Kelas\t\t: ");
            scanf("%s", &kelas);
            printf("\nNama Lengkap Anda\t: %s %s\n", nd, np);
            printf("NPM Anda\t\t: %d\n", npm);
            printf("Kelas Anda\t\t: %s\n", kelas);
            break;

        case 2:
            printf("\n---NILAI---\n");
            printf("Nilai UTS : ");
            scanf("%f", &uts);
            printf("Nilai UAS : ");
            scanf("%f", &uas);
            lp = (uts + uas) / 2;
            if(lp > 100 || lp < 0)
                printf("Error");
            else if(lp > 80)
                printf("Nilai Anda A");
            else if(lp > 60)
                printf("Nilai Anda B");
            else if(lp > 40)
                printf("Nilai Anda C");
            else
                printf("Nilai Anda D");
            printf("\n");
            break;

        case 3:
            printf("\n---LUAS PERMUKAAN TABUNG---\n");
            printf("Masukan Jari-jari\t: ");
            scanf("%f", &r);
            printf("Masukan Tinggi\t\t: ");
            scanf("%f", &t);
            lp = 3.14 * r * (r + 2 * t);
            printf("Luas Permukaan tabung : %.2f", lp);
            break;

        case 4:
            break;

        default:
            printf("\nPilihan yang Anda masukkan salah");
    }
}