Ошибка too few arguments to function

Question

I’m fairly new to C and I’ve got this error when I try to compile it (GCC):

error: too few arguments to function `printDay’

My questions are:

1. What does it mean?
2. How do I fix this?

P.S this is not my full code, it’s just this error I’m faced with.
Thanks in advance.

Code

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>

#define MAX_DAYS 31
#define MIN_DAYS 1
#define MAX_MONTHS 12
#define MIN_MONTHS 1

enum monthsOfYear
{
    jan = 1,
    feb,
    mar,
    apr,
    may,
    jun,
    jul,
    aug,
    sep,
    oct,
    nov,
    dec
};

enum daysOfWeek
{
    sun = 1,
    mon,
    tue,
    wed,
    thu,
    fri,
    sat
};

int input();
void check(int month, int day);
void printDay(int month, int day, int firstDay);

int main()
{
    printf("Hello! Welcome to the day calculator!n");
    printDay(input());
    return (0);
} 

/*this function takes the input from the user
input: none
output: the first day
*/ 
int input()
{
    enum daysOfWeek day = 0;
    enum monthsOfYear month = 0;
    
    int firstDay = 0;
    
    printf("Enter month to check: (1-jan, 2-feb, etc) ");
    scanf("%d", &month);
    printf("Enter day to check: ");
    scanf("%d", &day);
    check(month,day);
    printf("Enter the weekday of the 1st of the month: (1-Sunday, 2-Monday, etc) ");
    scanf("%d", &firstDay);
    
    return firstDay;
}

/*
this function checks the validity of the input
input: day, month
output: none
*/
void check(int month, int day)
{
    if(month > MAX_MONTHS || month < MIN_MONTHS && day > MAX_DAYS || day < MIN_DAYS)
    {
        printf("Invalid input, try againn");
        input();
    }
    if (month == feb && day > 28)
    {
        printf("Invalid input, try againn");
        input();
    }
    if (month == jan && day > 31)
    {
        printf("Invalid input, try againn");
        input();
    }
}

void printDay(int month, int day, int firstDay)
{
    int date = 0;
    date = day - firstDay;
    switch(day)
    {
        case sun:
        printf("%d.%d will be a Sunday", day, month);
        break;
        
        default: 
        break;
    }
}

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C programming language

In this article, we are going to learn about an error which occurs in C programming language when we use less argument while calling a function. If we do this compiler will generate an error «Too few arguments to function».

Submitted by IncludeHelp, on May 15, 2018

Too few arguments to function in C language

This error occurs when numbers of actual and formal arguments are different in the program.

Let’s understand first, what actual and formal arguments are?

Actual arguments are the variables, values which are being passed while calling a function and formal arguments are the temporary variables which we declare while defining a function.

Consider the given example:

int sum(int a, int b, int c)
{
	return  (a+b+c);
}

int main()
{
	int x,y,z;
	x = 10; y = 20; z = 30;
	
	printf("sum = %dn",sum(x, y, z));
	
	return 0;
}

Here, actual arguments are x, y and z. Formal arguments are a, b and c.

When, the error «too few arguments to function is occurred»?

Remember: Number of actual arguments (the arguments which are going to be supplied while calling the function) must equal to number of formal arguments (the arguments which are declared while defining a function).

This error will occur if the number of actual and formal arguments is different.

Consider the above example, and match with these below given calling statements, these statements will generate errors:

printf("sum = %dn", sum(x, y));
printf("sum = %dn", sum(x));
printf("sum = %dn", sum(10, 20));

Example: (by calling functions with less number of arguments)

#include <stdio.h>

int sum(int a, int b, int c)
{
	return  (a+b+c);
}
int main()
{
	int x,y,z;
	x = 10; y = 20; z = 30;
	
	printf("sum = %dn", sum(x, y));
	printf("sum = %dn", sum(x));
	printf("sum = %dn", sum(10, 20));
	
	return 0;
}

Output

prog.c: In function ‘main’:
prog.c:12:23: error: too few arguments to function ‘sum’
  printf("sum = %dn", sum(x, y));
                       ^~~
prog.c:3:5: note: declared here
 int sum(int a, int b, int c)
     ^~~
prog.c:13:23: error: too few arguments to function ‘sum’
  printf("sum = %dn", sum(x));
                       ^~~
prog.c:3:5: note: declared here
 int sum(int a, int b, int c)
     ^~~
prog.c:14:23: error: too few arguments to function ‘sum’
  printf("sum = %dn", sum(10, 20));
                       ^~~
prog.c:3:5: note: declared here
 int sum(int a, int b, int c)
     ^~~
prog.c:9:10: warning: variable ‘z’ set but not used [-Wunused-but-set-variable]
  int x,y,z;
          ^

So, while calling a function, you must check the total number of arguments. So that you can save your time by this type of errors.

Example: (by calling functions with correct number of arguments)

#include <stdio.h>

int sum(int a, int b, int c)
{
	return  (a+b+c);
}
int main()
{
	int x,y,z;
	x = 10; y = 20; z = 30;
	
	printf("sum = %dn", sum(x, y, z));
	printf("sum = %dn", sum(x,y,z));
	printf("sum = %dn", sum(10, 20,30));
	
	return 0;
}

Output

sum = 60
sum = 60
sum = 60

I run the C program and I get the following errors.
4:20: error: too few arguments to function call, at least argument ‘format’ must be specified int x= get_int();
/usr/include/cs50.h:82:1: note: ‘get_int’ declared here int get_int(const char *format, …)__attribute__((format(printf, 1, 2)));
7:20: error: too few arguments to function call, at least argument ‘format’ must be specified
int x= get_int();
/usr/include/cs50.h:82:1: note: ‘get_int’ declared here int get_int(const char *format, …) attribute((format(printf, 1, 2)));

Here’s the code

#include <cs50.h>
int main(void){
    int x= get_int();
switch(x)
{
    int x= get_int();
    case1:
    printf("One!n");
    break;
    case2:
    printf("Two!n");
    break;
    case3:
    printf("Three!n");
    break;
    default:
    printf("Sorry!n");
}
}

I’m aware the CS50 manual says about get_string:
#include <cs50.h>

char *get_string (const char *format, ...);

But, I’m still not sure if this information helps in my example.