Question

Write a C Program that:

- Creates an input file (input.txt)

- Take user inputted integer for number of lines in the input file

- accepts inputted text from command line to the input file (input.txt)

- saves and closes file. (input.txt)

- reopens and displays the newly inputted contents of the file

Answer 1

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

int main() {
    int i, n, num;
    FILE *fp = fopen("input.txt", "w");
    printf("How many numbers: ");
    scanf("%d", &n);
    printf("Enter %d integers: ", n);
    for (i = 0; i < n; ++i) {
        scanf("%d", &num);
        fprintf(fp, "%d\n", num);
    }
    fclose(fp);

    fp = fopen("input.txt", "r");
    while (fscanf(fp, "%d", &num) != EOF) {
        printf("%d\n", num);
    }
    fclose(fp);
    return 0;
}