to many arguments to function

Using Arduino Programming Questions
4

All right, this is the full code:

#include"sevenseg.h"
int val=0;
void setup(){
  sevensegpins(13, 12, 11, 10, 9, 8, 7);
  common_cathode(true);
}
void loop(){
  val=(analogRead(0));
  val=map(val, 0, 1023, 0, 9);
  sevenseg(val);
}

and also

#include<Arduino.h>
int pin_a;
int pin_b;
int pin_c;
int pin_d;
int pin_e;
int pin_f;
int pin_g;
int ON;
int OFF;
void sevensegpins(int a, int b, int c, int d, int e, int f, int g){
  pin_a=a;
  pin_b=b;
  pin_c=c;
  pin_d=d;
  pin_e=e;
  pin_f=f;
  pin_g=g;
  pinMode(pin_a, OUTPUT);
  pinMode(pin_b, OUTPUT);
  pinMode(pin_c, OUTPUT);
  pinMode(pin_d, OUTPUT);
  pinMode(pin_e, OUTPUT);
  pinMode(pin_f, OUTPUT);
  pinMode(pin_g, OUTPUT);
}
void common_cathode(boolean cathode){
  if(cathode==true){
    ON=HIGH;
    OFF=LOW;
  }
  else{
    ON=LOW;
    OFF=HIGH;
  }
}
void clearall(){
  digitalWrite(pin_a, OFF);
  digitalWrite(pin_b, OFF);
  digitalWrite(pin_c, OFF);
  digitalWrite(pin_d, OFF);
  digitalWrite(pin_e, OFF);
  digitalWrite(pin_f, OFF);
  digitalWrite(pin_g, OFF);
}
void zero(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_d, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
}
void one(){
  clearall();
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
}
void two(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_g, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_d, ON);
}
void three(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_g, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_d, ON);
}
void four(){
  clearall();
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
}
void five(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_d, ON);
}
void six(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_g, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_d, ON);
}
void seven(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
}
void eight(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_d, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
}
void nine(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_d, ON);
}
void lettera(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
}
void letterb(){
  clearall();
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_d, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_g, ON);
}
void letterB(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_d, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
}
void letterc(){
  clearall();
  digitalWrite(pin_d, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_g, ON);
}
void letterC(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_d, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
}
void letterd(){
  clearall();
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_d, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_g, ON);
}
void letterD(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_d, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
}
void lettere(){
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_d, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
}
void letterE(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_d, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
}
void letterf(){  
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_g, ON);
  }
void letterh(){
  clearall();
  digitalWrite(pin_c, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
}
void letterH(){
  clearall();
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_g, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
}
void letterl(){
  clearall();
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
}
void letterL(){
  clearall();
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_d, ON);
}
void letterp(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
}
void letterq(){
  digitalWrite(pin_a, ON);
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
}
void letters(){
  clearall();
  digitalWrite(pin_a, ON);
  digitalWrite(pin_f, ON);
  digitalWrite(pin_g, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_d, ON);
}
void letteru(){
  clearall();
  digitalWrite(pin_b, ON);
  digitalWrite(pin_c, ON);
  digitalWrite(pin_d, ON);
  digitalWrite(pin_e, ON);
  digitalWrite(pin_f, ON);
}
void sevenseg(int val){
  switch(val){
    case'0': zero();
    break;
    case'1': one();
    break;
    case'2': two();
    break;
    case'3': three();
    break;
    case'4': four();
    break;
    case'5': five();
    break;
    case'6': six();
    break;
    case'7': seven();
    break;
    case'8': eight();
    break;
    case'9': nine();
    break;
  }
}