CODEWITHSUNDEEP
cfile
aurora
aurora

Reputation: 27

warning: passing argument 1 of 'fprintf' from incompatible pointer type

warning: passing argument 1 of 'fprintf' from incompatible pointer type 
warning: passing argument 2 of 'fprintf' makes pointer from integer without a cast

How can I fix these two warnings? I cannot produce a file with expected output.

int main(int argc, char* argv[])
{
    int num_values = strtoul(argv[1], NULL, 10);
    value_t* pValues = generate_sequence(num_values);

    randomize_sequence(pValues, num_values);

    // Record results
    //FILE *fd = fopen("/results.txt", "w+");
    for (int i = 0; i < num_values; i++) { //change made: i++ to allow looping
        fprintf("results.txt", i, pValues[i]); //changes made: "fprintf". i and fd were added to the argument
    }
    //fclose(fd); //change made: "fclose"

    return EXIT_SUCCESS;
}

Upvotes: 0

Views: 5273

Answers (2)

Shubham
Shubham

Reputation: 1153

The general syntax for fprintf() is

int fprintf(FILE *stream, const char *format, ...)

Where first argument FILE *stream needs a file pointer, which should be opened for operation using

FILE *fptr = fopen("results.txt", "w");

function.

So, please uncomment line no. 54 and 58 then inside loop change the fprintf("results.txt", i, pValues[i]) to fprintf(fd, "%d", pValues[i]).

Also learn about Basics of File Handling in C.

Upvotes: 0

Elan Hamburger
Elan Hamburger

Reputation: 2177

The first argument to fprintf should be the FILE* that is returned from a call to fopen.

The second argument is a format string. Any further arguments are inserted into the placeholders in the format string.

Consider reading the manual page to better understand standard library functions.

Upvotes: 2

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