Writing a file using the fopen function

Question

I wrote the following C program to write data to a file. The program was compiled correctly, but nothing is written to the file. Please suggest changes if necessary.

#include <stdio.h>
#include <errno.h>

int main()
{
    int i;
    FILE *fopen(),*fp;
    fp = fopen("D:\Satish_SharedSubstance\V13.4-CT_Testing\LONGRUN_Testing\writetest.txt","w");
    /*Create a file and add text*/
    if(fp!=NULL)
    {
        fprintf(fp,"GRP \n");
        fprintf(fp,"groupname group_1 \n");
        fprintf(fp,"groupcomment group_1\n");
        fprintf(fp,"jobnet 255 \n");
        fprintf(fp,";\n");
        for (i=1;i<=255;i++)
        {
            fprintf(fp,"GNT \n");
            fprintf(fp,"jobnetname jobnet_t%d\n",i);
            fprintf(fp,"jobnetnumber %d\n",i);
            fprintf(fp,";");
        }
        /*writes data to the file*/
        fclose(fp); /*done!*/ 
    }
    else
    {
        printf("Error opening file\n");
    }
    return 0;
} 

Answer 1

Two things:

• Change * fopen () in the variable declaration.
• Backslashes must be escaped in lines C. Replace " \" with " \\".

Answer 2

 fp = fopen("D:\Satish_SharedSubstance\V13.4-CT_Testing\LONGRUN_Testing\writetest.txt","w");

Try replacing "\"on "\\"the go.

Answer 3

You can do the following: -

FILE *fp = fopen("D:\\Satish_SharedSubstance\\V13.4-CT_Testing\\LONGRUN_Testing\\writetest.txt","w");