10 example of a predefined function in a c?

Answer 1

1. Cat2. Cake3. Closet4. Coffin5. Cuckoon6. Cukoo Clock7. Clock8. Case9. Card10. ClothesThere we go, then things starting with C, if that is what you were asking for, but if its not, i would make your question more understandable, maybe change some words.Bye x

Answer 2

A function definition provides the compiler with the implementation of a given function. In order to call any function, the function must be declared to the compiler, even if the definition of that function cannot be seen by the compiler. The compiler only works on one translation unit at a time and cannot see any of the definitions contained within other translation units, but the declaration alone suffices to ensure the function is being used correctly (in terms of its return type and its argument types). If a function is used but is not defined in any translation unit, a linker error will occur.

Typically, function declarations are placed at the top of the source file that uses them (known as forward declarations), however to avoid re-typing the same declarations over and over in multiple translation units, we can group function declarations together in appropriately named header files which can then be included in any source file where they are required. Every function that is used by a program must be defined somewhere. If a function is defined by more than one translation unit, the definitions must be token-for-token identical in order for the linker to treat them as a single definition (known as the one-definition rule, or ODR).

The definition of a function is itself a declaration and that declaration must match all (forward) declarations of that function. Function declarations need not name any of their formal arguments (the type alone suffices), however naming the formal arguments is useful for documentation purposes. Those names will be ignored by the compiler unless the declaration is also a definition in which case the formal argument names are required unless an argument is not used by the definition (reserved arguments or dummy parameters need not be named by the definition since they are not used).

Example:

// declaration

unsigned f (unsigned);

int main (void) {

printf ("Factorial 10 is %u\n", f(10)); // use the function

return 0;

}

// definition

unsigned f (unsigned x) {

if (x>1)

return x * f (x-1); // recursive...

else

return 1;

}