[goodtrip]

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

#define MAX_LINE_LENGTH 1000
#define MAX_EMAIL_LENGTH 100

// Function to check if a string is a valid email address
int isValidEmail(char *str) {
    char *at = strchr(str, '@');
    char *dot = strchr(str, '.');
    return (at != NULL && dot != NULL && dot > at);
}

int main(int ac , char **av) {
    FILE *inputFile, *outputFile;
    char line[MAX_LINE_LENGTH];
    char email[MAX_EMAIL_LENGTH];

    // Open input file
    inputFile = fopen(av[1], "r");
    if (inputFile == NULL) {
        perror("Error opening input file");
        return 1;
    }

    // Open output file
    outputFile = fopen("output.txt", "w");
    if (outputFile == NULL) {
        perror("Error opening output file");
        fclose(inputFile);
        return 1;
    }

    // Read input file line by line
    while (fgets(line, sizeof(line), inputFile)) {
        char *token = strtok(line, ",");
        while (token != NULL) {
            if (isValidEmail(token)) {
                strcpy(email, token);
                fprintf(outputFile, "%s\n", email);
            }
            token = strtok(NULL, ",");
        }
    }

    // Close files
    fclose(inputFile);
    fclose(outputFile);

    printf("Emails extracted successfully!\n");

    return 0;
}

[lirnk9]

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

#define MAX_LINE_LENGTH 1000
#define MAX_EMAIL_LENGTH 100

// Function to check if a string is a valid email address
int isValidEmail(char *str) {
    char *at = strchr(str, '@');
    char *dot = strchr(str, '.');
    return (at != NULL && dot != NULL && dot > at);
}

int main(int ac , char **av) {
    FILE *inputFile, *outputFile;
    char line[MAX_LINE_LENGTH];
    char email[MAX_EMAIL_LENGTH];

    // Open input file
    inputFile = fopen(av[1], "r");
    if (inputFile == NULL) {
        perror("Error opening input file");
        return 1;
    }

    // Open output file
    outputFile = fopen("output.txt", "w");
    if (outputFile == NULL) {
        perror("Error opening output file");
        fclose(inputFile);
        return 1;
    }

    // Read input file line by line
    while (fgets(line, sizeof(line), inputFile)) {
        char *token = strtok(line, ",");
        while (token != NULL) {
            if (isValidEmail(token)) {
                strcpy(email, token);
                fprintf(outputFile, "%s\n", email);
            }
            token = strtok(NULL, ",");
        }
    }

    // Close files
    fclose(inputFile);
    fclose(outputFile);

    printf("Emails extracted successfully!\n");

    return 0;
}

what is this please. can you please provide some details.