Reading lines from c file and putting the strings into an array

Question

I'm trying to add each line of a c file into an array. The contents of files.txt is

first.c
second.c
third.c
fourth.c

I want my code to print each of these lines, add the line to my array, and then print out each entry in my array. Right now it is doing the first part correctly but it is only adding fourth.c to the array. Can someone tell me what is wrong with my code?

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

int main(void) {
    int i=0;
    int numProgs=0;
    char* programs[50];
    char line[50];

    FILE *file;
    file = fopen("files.txt", "r");

    while(fgets(line, sizeof line, file)!=NULL) {
        //check to be sure reading correctly
        printf("%s", line);
        //add each filename into array of programs
        programs[i]=line; 
        i++;
        //count number of programs in file
        numProgs++;
    }

    //check to be sure going into array correctly 
    for (int j=0 ; j<numProgs+1; j++) {
        printf("\n%s", programs[j]);
    }

    fclose(file);
    return 0;
}

Solution

You need to change

programs[i]=line; 

to

programs[i]=strdup(line); 

Otherwise all pointers in the programs array will point to the same location (that is line).

BTW: if files.txt contains more than 50 lines, you will run into trouble.