C Program to print contents of file

fopen() is used to open and fclose() is used to close a file in C

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#include <stdio.h>
#include <stdlib.h> // For exit()
  
int main()
{
    FILE *fptr;
  
    char filename[100], c;
  
    printf("Enter the filename to open \n");
    scanf("%s", filename);
  
    // Open file
    fptr = fopen(filename, "r");
    if (fptr == NULL)
    {
        printf("Cannot open file \n");
        exit(0);
    }
  
    // Read contents from file
    c = fgetc(fptr);
    while (c != EOF)
    {
        printf ("%c", c);
        c = fgetc(fptr);
    }
  
    fclose(fptr);
    return 0;
}

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Output:

Enter the filename to open
a.txt
/*Contents of a.txt*/

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