LV7

//PRVI

#include <stdio.h>
#include <stdlib.h>

#define MAX_STUDENTS 100

void write_students_to_file(char* filename, char** names, char** surnames, int count) {
    FILE* file = fopen(filename, "w");
    if (file == NULL) {
        printf("Failed to open file %s for writing.\n", filename);
        return;
    }

    for (int i = 0; i < count; i++) {
        fprintf(file, "Student broj: %d.\tIme: %s\t Prezime: %s\n", i + 1, names[i], surnames[i]);
    }

    fclose(file);
}

int main() {
    char* filename = "dat.txt";
    FILE* file = fopen(filename, "r");
    if (file == NULL) {
        printf("Failed to open file %s for reading.\n", filename);
        return 1;
    }

    int num_students;
    if (fscanf(file, "%d", &num_students) != 1) {
        printf("Failed to read number of students from file %s.\n", filename);
        fclose(file);
        return 1;
    }

    fclose(file);

    if (num_students < 1 || num_students > MAX_STUDENTS) {
        printf("Invalid number of students: %d (must be between 1 and %d).\n", num_students, MAX_STUDENTS);
        return 1;
    }

    char* names[MAX_STUDENTS];
    char* surnames[MAX_STUDENTS];

    for (int i = 0; i < num_students; i++) {
        char name[100], surname[100];
        printf("Unesite ime i prezime za studenta broj %d:\n", i + 1);
        scanf("%s %s", name, surname);

        names[i] = malloc(strlen(name) + 1);
        surnames[i] = malloc(strlen(surname) + 1);

        if (names[i] == NULL || surnames[i] == NULL) {
            printf("Failed to allocate memory for student names.\n");
            return 1;
        }

        strcpy(names[i], name);
        strcpy(surnames[i], surname);
    }

    write_students_to_file("studenti.txt", names, surnames, num_students);

    for (int i = 0; i < num_students; i++) {
        free(names[i]);
        free(surnames[i]);
    }

    return 0;
}

//DRUGI

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

// Funkcija za ispis matrice
void print_matrix(double **mat, int rows, int cols) {
    printf("Matrica:\n");
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            printf("%10.2f", mat[i][j]);
        }
        printf("\n");
    }
}

int main() {
    // Ucitavanje brojeva iz datoteke
    FILE *in_file = fopen("C:\\path\\to\\in.txt", "r");
    int n, m;
    fscanf(in_file, "%d %d", &n, &m);
    fclose(in_file);

    // Alociranje memorije za matricu
    double **mat = (double **) malloc(n * sizeof(double *));
    for (int i = 0; i < n; i++) {
        mat[i] = (double *) malloc(m * sizeof(double));
    }

    // Popunjavanje matrice pseudo-slucajnim brojevima
    srand(time(NULL)); // Postavljanje sjemena za generator pseudo-slucajnih brojeva
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            mat[i][j] = -125.5 + (double) rand() / RAND_MAX * (65.8 - (-125.5));
        }
    }

    // Ispisivanje matrice
    print_matrix(mat, n, m);

    // Alociranje memorije za izlaznu matricu
    double **out_mat = (double **) malloc((n-1) * sizeof(double *));
    for (int i = 0; i < n-1; i++) {
        out_mat[i] = (double *) malloc((m-1) * sizeof(double));
    }

    // Popunjavanje izlazne matrice
    for (int i = 1; i < n; i++) {
        for (int j = 0; j < m-1; j++) {
            out_mat[i-1][j] = mat[i][j+1];
        }
    }

    // Ispisivanje izlazne matrice
    print_matrix(out_mat, n-1, m-1);

    // Zatvaranje izlazne datoteke
    fclose(out_file);

    // Oslobadanje memorije
    for (int i = 0; i < n; i++) {
        free(mat[i]);
    }
    free(mat);

    for (int i = 0; i < n-1; i++) {
        free(out_mat[i]);
    }
    free(out_mat);

    return 0;
}


//TRECI

#include <stdio.h>
#include <ctype.h>

void copyFile(FILE* source, FILE* destination) {
    char ch;
    while ((ch = fgetc(source)) != EOF) {
        fputc(toupper(ch), destination);
    }
}

int main() {
    FILE* sourceFile = fopen("C:/putanja/do/prva.txt", "r");
    FILE* destinationFile = fopen("druga.txt", "w");
    if (sourceFile == NULL || destinationFile == NULL) {
        printf("Nemoguće otvoriti datoteke!\n");
        return 1;
    }
    copyFile(sourceFile, destinationFile);
    printf("Kopiranje završeno!\n");
    fclose(sourceFile);
    fclose(destinationFile);
    return 0;
}