How can I pass a long type value into the parameter of a function with integer as the return type?

I'm having trouble setting up the code for a function. The error message show: conflicting types.

So I think it's because my return type is different from the value in the parameter. So I was wondering if it's possible to have different types of values in the parameter and how to fix this code.

//prompt user to enter the credit card number and print it on screen  long get_credit()  {     long credit_number = get_long("Number: ");     //printf("Number: %li\n",credit_number); //debugging    return credit_number;  }    //digits lengther  int get_digit(long credit_number)  {         long credit = credit_number; //length of the number of digits given by the user         int length = 0;         while(credit != 0)         {         credit = credit/10 ;         length ++ ;         }         return length;  }  

This is the error message it's showing me.

credit_v2.c:154:5: error: conflicting types for 'get_digit'  int get_digit(long credit_number)      ^  credit_v2.c:7:5: note: previous declaration is here  int get_digit(void); //calculate the number of digits      ^  

Again, thank you guys for all the help!

https://stackoverflow.com/questions/65433435/how-can-i-pass-a-long-type-value-into-the-parameter-of-a-function-with-integer-a December 24, 2020 at 10:59AM