#include <stdio.h>
#include <stdlib.h> // for exit() function

int main() {
    // Declaration and initialization of variables

    char name[50];
    int age;
    float height;
    double weight;

    // Prompting user for input

    printf("Enter your name: ");
    scanf("%s", name);
    
    printf("Enter your age: ");
    scanf("%d", &age);
    
    printf("Enter your height (in meters): ");
    scanf("%f", &height);
    
    printf("Enter your weight (in kilograms): ");
    scanf("%lf", &weight);

    // Displaying user input

    printf("\nHello, %s!\n", name);
    printf("Age: %d years\n", age);
    printf("Height: %.2f meters\n", height);
    printf("Weight: %.2lf kilograms\n", weight);

    // File handling: Writing user information to a file

    FILE *fp;
    fp = fopen("userinfo.txt", "w");
    if (fp == NULL) {
        perror("Error opening file");
        exit(1); // Exit program if file opening fails
    }

    fprintf(fp, "Name: %s\n", name);
    fprintf(fp, "Age: %d years\n", age);
    fprintf(fp, "Height: %.2f meters\n", height);
    fprintf(fp, "Weight: %.2lf kilograms\n", weight);

    printf("\nUser information has been written to 'userinfo.txt'.\n");

    // Closing the file

    fclose(fp);

    return 0;
}