fprintf not giving the values expected - c

Question

I am trying to read numbers from multiple text files starting with 'numbers' and calculate the sum. I am getting some random numbers not contained in the file I am opening. I have tried initializing the array at 0 but that just made everything 0 on output.
This is the problem section I believe
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
DIR *d;
struct dirent *dir;
int fileAndSum(){
int sum = 0, i = 0;
int nums[100];
FILE* fptr = fopen(dir->d_name,"r");
fputs("11111111111111111", fptr);
for(i = 0; i <10; i++){
fscanf(fptr,"%d", &nums[i]);
printf("%d\n", nums[i]);
sum+=nums[i];
}
printf("%s\n", "----------sum--------------");
printf("%d\n", sum);
fclose(fptr);
The rest
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
DIR *d;
struct dirent *dir;
int fileAndSum(){
int sum = 0, i = 0;
int nums[100];
FILE* fptr = fopen(dir->d_name,"r");
for(i = 0; i <10; i++){
fscanf(fptr,"%d", &nums[i]);
printf("%d\n", nums[i]);
sum+=nums[i];
}
printf("%s\n", "----------sum--------------");
printf("%d\n", sum);
fclose(fptr);
}
int main(void) {
d = opendir("numdir");
char strhold[50] = "numbers";
char fileName[50];
while ((dir = readdir(d)) != NULL) {
printf("%s\n", dir->d_name);
if(strstr(dir->d_name, strhold)){
printf("%s%s%s\n", "----------Now reading ",dir->d_name,"--------------");
fileAndSum();
printf("%s\n", "----------Next file--------------");
}
}
closedir(d);
return(0);
}

Answer 1

Your files to read are in directory numdir, but you are trying to read files in current working directory.
Also you should check if file open is successful.
to fix, the part
FILE* fptr = fopen(dir->d_name,"r");
should be
char fileName[1024];
snprintf(fileName, sizeof(fileName), "numdir/%s", dir->d_name);
FILE* fptr = fopen(fileName,"r");
if(fptr == NULL){
puts("open failed");
return 0;
}