CS50 error: called object type 'int' is not a function or function point in C

Question

I'm a newbie at programming and currently I'm taking the CS50 course at Harvard edX. I'm trying to solve the "credit" problem but no matter what I keep myself stuck in this error: called object type 'int' is not a function or point.

I've already tried to read book fragments, answers on this website and nothing makes sense cause, to me (a newbie, I admit), my int is declared a function!! Can someone help me to see the light on this problem? I'll copy and paste my code here below:

int lenght_card = 0;
long visa_start = card;
long amex_start = card;
long master_start = card;

while (card > 0)
{
    card = card/10;
    lenght_card++;

}

// Identifying the card as Visa

{

visa_start = card/10000000000000;

}

if ((visa_start == 4)(lenght_card == 16 || lenght_card == 13));

{
    printf("%s\n," "VISA");
    return 0;

PS: the error shows up in the line 86 specifically: (lenght_card == 16 || lenght_card == 13));

Thanks in advance!

Answer 1

There are typos.

For example in this if statement

if ((visa_start == 4)(lenght_card == 16 || lenght_card == 13));

you need to remove the semicolon at the end of the statement and seems you missed the logical AND operator

if ((visa_start == 4) && (lenght_card == 16 || lenght_card == 13))

Another typo is in this call

printf("%s\n," "VISA");

The comma shall be outside the format string

printf("%s\n", "VISA");

You could just write

puts( "VISA" );