How to pass file pointer to a function in c - c

Question

I want to pass the file pointer as an argument to view function. And then I want to get the output the data on file from the view function. But every time telling me file not found.
#include<stdio.h>
void view(FILE *file){
char c;
file=fopen(file,"r");
if(file==NULL){
printf("file not found");
}
else{
while(!feof(file)){
c=fgetc(file);
printf("%c",c);
}
fclose(file);
}
}
int main(){
FILE *file;
file=fopen("hello.txt","w");
char s[]="hello world";
fprintf(file,"%s",s);
fclose(file);
printf("Enter 1 to read file");
int n;
scanf("%d",&n);
if(n==1)
view(file);
return 0;
}

Answer 1

Your error is here:
file=fopen(file,"r");
Use something like this:
file=fopen("file name","r");

Answer 2

As already stated in the comments, and in this answer, the fopen argument is wrong, you pass a pointer to file when you should pass the file path.
Other than that you could refactor your code so that you wouldn't have to close and reopen the file:
void view(FILE *file)
{
// the file is already opened, no need to reopen it
int c;
while ((c = fgetc(file)) != EOF) // better read routine
{ // you could also use fgets to read the whole line
printf("%c", c);
}
fclose(file);
}
int main()
{
FILE *file;
file = fopen("hello.txt", "w+"); // open to write and read
int n;
char s[] = "hello world";
if (file == NULL)
{
printf("file not found"); // perror("fopen"); would be better
return EXIT_FAILURE; // #include <stdlib.h>
}
fprintf(file, "%s", s);
printf("Enter 1 to read file: ");
if (scanf("%d", &n) == 1)
{
if (n == 1)
{
rewind(file); // reset file pointer offset to the beginning
view(file);
}
}
}