// some examples using an array of strings

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

void printstrs(char [][51], int);
void readstring(FILE *, char [], int);

int main(int argc, char** argv) {
    int i;
    // array of 5 strings which can hold 50 char each
    char strings[5][51];

    FILE *infile = fopen("strings.txt", "r");

    // call function to read one string from the file
    // if you use one subscript, you are using an array of characters (a string)
    for (i = 0 ; i < 5 ; i++)
        readstring(infile, strings[i], 51);

    printf("\nthe strings are: \n");
    for (i = 0 ; i < 5 ; i++)
        printf("%s\n", strings[i]);
    printf("\n");

    // copy a string and then change some of the characters
    // if you use two subscripts, you are referencing an individual character
    // within one of the strings, so strings[3][0] is the 1st character
    // in the 4th string
    strcpy(strings[3], strings[1]);
    strings[3][0] = 'X';
    strings[3][1] = 'Y';
    strings[3][2] = 'Z';

    // pass the whole array to a function that will print all the strings
    printf("now the strings are:\n");
    printstrs(strings, 5);

    return (EXIT_SUCCESS);
}

// first parm is an array of strings, each string has 51 locations
// second parm is the number of strings to print
void printstrs(char strarr[][51], int numstr) {
    int i;
    for (i = 0 ; i < numstr ; i++)
        printf("%s\n", strarr[i]);

}

// read a string from the given input file
void readstring(FILE *infile, char str[], int len) {
    fgets(str, len, infile);
}