My program don"t execute fscanf

[toby1a05]

My program just end directly,the program don"t execute fscanf function,how do i fix this problem

  #include <stdio.h>

 
int main()

{

    FILE *fp;

    int  i,j,var;

    fp = fopen("data2.txt","w");     /* open file pointer */

  

for ( i = 0; i < 5; i++ )

    {

       for ( j = 0; j < 5; j++ )

       {

        fscanf(fp,"%d",&var);

        printf("%c",var);

       }

       printf("\n");

    }

    fclose(fp);

}

[E0p9LyTq]

After you attempt to open their file you don't check if the file was actually opened. If it wasn't you are trying to read data from a NULL stream.

Why doesn't the program open the file? Likely the file isn't in the same location the program executes from,

[JLBorges]

Open the file for input (reading).

#include <stdio.h>

int main()
{
    // "r" open the file for reading
    FILE* fp = fopen( "data2.txt", "r" ) ;

    if( fp != NULL ) // if the file was opened
    {
        // try to read 5 integers from the file
        for( int i = 0 ; i < 5 ; ++i )
        {
            int var ;

            if( fscanf( fp, "%d", &var) == 1 ) // if one value was read in (successful scanf)
                printf( "%d\n", var ) ; // print the value that was read

            else puts( "input failure (failed to read an int)\n" ) ;
        }
    }

    else puts( "failed to open input file" ) ;
}