Question

Is this code right for writing a character array (referenced by a char pointer) to a file?

const char* charBuf;

FILE *outputFile = fopen("output", "a");
fprintf(outputFile, "%s\n", *charBuf);
fclose(outputFile);

Assume buf points to some character array.

Answer 1

File mode needs a quote:

File *outputFile = fopen("output", "a");

unless you have a c-string a defined with the mode.

Assuming you have stored some value into charBuf, you have to use the string in fprintf. *charBuf refers to the first character in that string.

fprintf(outputFile, "%s\n", charBuf);

You need to show more code for a better answer.