A function may have any number of return statements each returning different values.

True, The default return type for a function is int.

A function cannot be defined inside the another function, but a function can be called inside a another function.

True, A function cannot return more than one value at a time. because after returning a value the control is given back to calling function.

Any function including main() can be called recursively.

Step 1: int i=0; The variable i is declared as in integer type and initialized to '0'(zero).

Step 2: i++; Here variable i is increemented by 1. Hence i becomes '1'(one).

Step 3: if(i<=5) becomes if(1 <=5). Hence the if condition is satisfied and it enter into if block statements.

Step 4: printf("CuriousTab"); It prints "CuriousTab".

Step 5: exit(1); This exit statement terminates the program execution.

Hence the output is "CuriousTab".

True, A function can be called either call by value or call by reference.

Example:

Call by value means c = sub(a, b); here value of a and b are passed.

Call by reference means c = sub(&a, &b); here address of a and b are passed.

True, If two function are declared in a same name, it gives "Error: Multiple declaration of function_name())".

Yes. If a function contains two return statements successively, the compiler will generate "Unreachable code" warnings.

Example:

#include<stdio.h>
int mul(int, int); /* Function prototype */

int main()
{
    int a = 4, b = 3, c;
    c = mul(a, b);
    printf("c = %d\n", c);
    return 0;
}
int mul(int a, int b)
{
   return (a * b);
   return (a - b); /* Warning: Unreachable code */
}

Output:
c = 12

A function can return floating point value.

Example:

#include <stdio.h>
float sub(float, float); /* Function prototype */

int main()
{
    float a = 4.5, b = 3.2, c;
    c = sub(a, b);
    printf("c = %f\n", c);
    return 0;
}
float sub(float a, float b)
{
   return (a - b);
}

Output:
c = 1.300000

No, C can accept upto 127 maximum number of arguments in a function.