C program to convert text file to binary

Write a C program to convert text file to binary file.

  #include <stdio.h>
  #include <string.h>
  #define MAX 256

  int main() {
        int num;
        FILE *fp1, *fp2;
        char ch, src[MAX], tgt[MAX];

        /* get the input file name from the user */
        printf("Enter your input file name:");
        scanf("%s", src);

        /* get the output filename from the user */
        printf("Enter your output file name:");
        scanf("%s", tgt);

        /* open the source file in read mode */
        fp1 = fopen(src, "r");

        /* error handling */
        if (!fp1) {
                printf("Unable to open the input file!!\n");
                return 0;
        }

        /* open the target file in binary write mode */
        fp2 = fopen(tgt, "wb");

        /* error handling */
        if (!fp2) {
                printf("Unable to open the output file!!\n");
                return 0;
        }

        /*

         * read data from input file and write

         * the binary form of it in output file

         */

        while (!feof(fp1)) {

                /* reading one byte of data */

                fread(&ch, sizeof(char), 1, fp1);

                /* converting the character to ascii integer value */

                num = ch;

                /* writing 4 byte of data to the output file */

                fwrite(&num, sizeof(int), 1, fp2);

        }

        /* close all opened files */

        fclose(fp1);

        fclose(fp2);

        return 0;

  }

  Output:

  jp@jp-VirtualBox:~/$ cat data.txt
  abcdefg1234
  56789hijklm
  123456abcde
  fghijk12345

  jp@jp-VirtualBox:~/$ ./a.out
  Enter your input file name: data.txt
  Enter your output file name: res.bin

  jp@jp-VirtualBox:~/$  vi res.bin

  a^@^@^@b^@^@^@c^@^@^@d^@^@^@e^@^
  a^@^@^@b^@^@^@c^@^@^@d^@^@^@e^@^
  a^@^@^@b^@^@^@c^@^@^@d^@^@^@e^@^

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