os22

Q1)
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <mpi.h>

#define ARRAY_SIZE 1000

int main(int argc, char *argv[]) {
MPI_Init(&argc, &argv);

int rank, size;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);

int *arr = (int *)malloc(ARRAY_SIZE * sizeof(int));

if (rank == 0) {
    srand(time(NULL));
    for (int i = 0; i < ARRAY_SIZE; i++) {
        arr[i] = rand() % 1000;
    }
}

int sum_local = 0;
for (int i = rank; i < ARRAY_SIZE; i += size) {
    if (arr[i] % 2 != 0) {
        sum_local += arr[i];
    }
}

int sum_global;
MPI_Reduce(&sum_local, &sum_global, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);

if (rank == 0) {
    printf("Sum of all odd numbers: %d\n", sum_global);
}

free(arr);
MPI_Finalize();
return 0;

}
Q2)
#include <stdio.h>
#include <stdlib.h>

#define MAX_BLOCKS 100

void showBitVector(int bitVector[], int n) {
printf("Bit Vector: ");
for (int i = 0; i < n; i++) {
printf("%d ", bitVector[i]);
}
printf("\n");
}

void deleteFile(int bitVector[], int n) {
int blockNum;
printf("Enter the block number to delete the file: ");
scanf("%d", &blockNum);

if (blockNum >= 0 && blockNum < n) {
    if (bitVector[blockNum] == 1) {
        bitVector[blockNum] = 0;
        printf("File deleted successfully from block %d\n", blockNum);
    } else {
        printf("Error: Block %d is already free\n", blockNum);
    }
} else {
    printf("Error: Invalid block number\n");
}

}

int main() {
int n;
printf("Enter the total number of disk blocks: ");
scanf("%d", &n);

int bitVector[MAX_BLOCKS] = {0}; // Initialize all blocks as free

while (1) {
    printf("\nMenu:\n");
    printf("1. Show Bit Vector\n");
    printf("2. Delete already created file\n");
    printf("3. Exit\n");
    printf("Enter your choice: ");

    int choice;
    scanf("%d", &choice);

    switch (choice) {
        case 1:
            showBitVector(bitVector, n);
            break;
        case 2:
            deleteFile(bitVector, n);
            break;
        case 3:
            printf("Exiting...\n");
            exit(0);
        default:
            printf("Invalid choice! Please enter a valid option.\n");
    }
}

return 0;

}