Functions Questions

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If x and y are variables as declared below.

double x = 0.005, y = - 0.01;


what is the value of ceil (x + y), where ceil is a function to compute ceiling of a number?

int test (n)
int n;
{
int i;
long int prod = 1;
if(n > 1)
for (i = 2; i < = n; i++)
prod *=  i
return (prod);
}

void summation (n)
int n;
{
int i; sum = 0;
i = 1;
for(i = 1; i < = n; i++)
sum+= i;
}

Which of the following is true about const member functions?

main ()
{
}
int a;
f1(){}
f2(){}

Which of the functions is int a available for?

int main ()
{
int i = 2, j = 3, k = 1;
swap (i, j);
printf ("%d %d", i, j);
}
swap (int i, int j)
{
int temp;
temp = i; i = j; j = temp;
}

void my_recursive_function(int n)
{
    if(n == 0)
    return;
    printf("%d ",n);
    my_recursive_function(n-1);
}
int main()
{
    my_recursive_function(10);
    return 0;
}

Is there any difference between following declarations?

A : extern int fun();
B : int fun();

int fun(int arr[]);
int fun(int arr[2]);

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