Using goto for Exception Handling in C

#include <stdio.h>

int main() {
    FILE *file = NULL;

    // Attempt to open the file
    file = fopen("example.txt", "r");
    if (file == NULL) {
        printf("Error opening file\n");
            
        // Jump to the error section if the file couldn't be opened
        goto error;  
    }
    printf("File opened successfully!\n");
    fclose(file);
    return 0;

error:
  
    // Error handling section
    printf("Exiting\n");
    return 1;
}

#include <stdio.h>
int main() {
    FILE *file = NULL;
    int result = 0;

    file = fopen("example.txt", "r");
    if (file == NULL) {
        printf("Error opening file\n");
      
        // Jump to the error label if file cannot be opened
        goto error;  
    }

    // Read data (simulating an error)
    result = fread(NULL, 1, 100, file);
    if (result == 0) {
        printf("Error reading file\n");
      
        // Jump to error if reading fails
        goto error;  
    }

    // Process data (simulating a successful operation)
    printf("Successfull\n");

    // Close the file and exit
    fclose(file);
    return 0;

error:
  
    // Error handling section
    if (file != NULL) {
        fclose(file);
    }
    return 1; 
}

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

int processFile(const char *filename) {
    FILE *file = NULL;
    char *buffer = NULL;

    // Open the file
    file = fopen(filename, "r");
    if (!file) {
        fprintf(stderr, "Error: Failed to open file '%s'\n", filename);
        goto cleanup;
    }

    // Allocate memory for the buffer
    buffer = (char *)malloc(1024);
    if (!buffer) {
        fprintf(stderr, "Error: Memory allocation failed\n");
        goto cleanup;
    }

    // Simulate reading file content
    if (fread(buffer, 1, 1024, file) == 0) {
        fprintf(stderr, "Error: Failed to read file\n");
        goto cleanup;
    }

    printf("File processed successfully.\n");

cleanup:
    // Cleanup resources
    if (buffer) free(buffer);
    if (file) fclose(file);

    // Return error status
    return (file && buffer) ? 0 : -1;
}

int main() {
    const char *filename = "example.txt";

    if (processFile(filename) != 0) {
        fprintf(stderr, "An error occurred while"
                "processing the file.");
        return 1;
    }

    return 0;
}