Question & Answer: This needs to be done in C. Please make it as simple and basic as possible. This is an Intro to C Programming c…..

Open a file with a function
#include <stdio.h>
#include <errno.h>
int main (void) {
    FILE *fp;
    fp = fopen ("write.txt","w");
    if (fp == NULL) {
        printf ("File not created okay, errno = %dn", errno);
        return 1;
    }
    //fprintf (fp, "Hello, there.n"); // if you want something in the file.
    fclose (fp);
    printf ("File created okayn");
    return 0;
}

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Read a line of a file with a function

#include <stdio.h>
#include <stdlib.h> // For exit() function
int main()
{
    char c[1000];
    FILE *fptr;

    if ((fptr = fopen("program.txt", "r")) == NULL)
    {
        printf("Error! opening file");
        // Program exits if file pointer returns NULL.
        exit(1);         
    }

    // reads text until newline 
    fscanf(fptr,"%[^n]", c);

    printf("Data from the file:n%s", c);
    fclose(fptr);
    
    return 0;
}

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#include <stdio.h>

int main(void){
    int end, loop, line;
    char str[512];
    FILE *fd = fopen("data.txt", "r");
    if (fd == NULL) {
        printf("Failed to open filen");
        return -1;
    }
    printf("Enter the line number to read : ");
    scanf("%d", &line);

    for(end = loop = 0;loop<line;++loop){
        if(0==fgets(str, sizeof(str), fd)){//include 'n'
            end = 1;//can't input (EOF)
            break;
        }
    }
    if(!end)
        printf("nLine-%d: %sn", line, str);
    fclose(fd);

    return 0;
}

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Print the results with a function —> Use printf()