writing a table in a file through c program

 #include <stdio.h>

void table(FILE *ptr,int a)

{

for(int i=1;i<=10;i++)

{

fprintf(ptr,"%d X %d = %d\n",a,i,(a*i));

}

}

int main(){

FILE * ptr;

int a=8;

ptr=fopen("tables.txt","w");

fprintf(ptr,"The table of %d:\n",a);

table(ptr,a);

fclose(ptr);

 return 0;

}