arrays - C Error. What does the subscript operator want? -

i quite new c programming (started learning yesterday, actually!) receiving error messages regarding subscript operator in c, seems cyclically requiring different input each error message.

my code follows:

int i; file *f = fopen("verletdata.txt","w"); for(i=0; <= n; i++)    {         fprintf(f,"%i\t%3.4f\n", n[i], x[i]); } fclose(f); 

for receive following error:

subscripted value neither array nor pointer nor vector. (line 74, c/c++ problem)

now, following advice cameron skinner on q&a, error: subscripted value neither array nor pointer, changed int *int, follows:

int* i; file *f = fopen("verletdata.txt","w"); for(i=0; <= n; i++)    {         fprintf(f,"%i\t%3.4f\n", n[i], x[i]); } fclose(f); 

for receive following error requiring i integer:

array subscript not integer. (line 74, c/c++ problem)

line 74 in both cases fprintf(f,"%i\t%3.4f\n", n[i], x[i]);.

how can fix problem in code, , avoid happening again in future, subscript operator require me in case? documentation little hazy in aspect beginner.

as noted in comment, need see definition of n , x, because 1 of them isn't array or pointer, seem. not int i; cause of trouble.

you're right! had accidentally defined n, integer, array in code snippet above.

it more question of trying treat n array when integer, account trouble.

note when changed i int int *, made other expression invalid: because x pointer already, x[i] involved 2 pointers, , while fixed n[i] expression (unorthdoxly — see with c arrays, why case a[5] == 5[a]?), broke correct x[i].