C language - the function definition

Defined functions, and call

/ * 
Call functions 
* /  
#include <stdio.h>
 void FUNC ( void ) { 
    the printf ( " . 1 \ n- " ); 
} 

int main () { 
    FUNC (); 
    return  0 ; 
}

Using the return value using a function defined in the operation int func (void)

/ * 
Return value returned Demo 
* / 
#include <stdio.h>
 int Read ( void ) {
     static  int Val = 0 ; 
    the printf ( " Enter a number: " ); 
    Scanf ( " % D " , & Val); 
     return Val; 
} 
int main () {
     int Val = Read (); 
    the printf ( " the number you entered is D% \ n- " , Val); 
}

Parameter input function void func (int val, int val1)

/*
输入参数演示
*/ 
#include <stdio.h>
void read(int val, int val1) {
    printf("%d x %d = %d\n", val, val1, val * val1);  
}

int main() {
    int tmp = 0; 
    for (tmp = 1;tmp <= 5;tmp++) {
        read(tmp, 10 - tmp); 
    }
}

In function, using the operation input array parameters

/ * 
Printing operation arrays 
* / 
#include <stdio.h>
 void Print ( int ARR [], int size) {
     int tmp = 0 ; 
     for (tmp = 0 ; tmp <size; tmp ++ ) { 
        the printf ( " % D " , ARR [tmp]); 
    } 
    the printf ( " \ n- " ); 
} 
int main () {
     int ARR [ . 5 ] = { . 1 , 2 , . 3 , . 4 , . 5 };
    print(arr, 5); 
}

In function of the input array for operation because the input address of the array is represented, the return value may not be required

/ * 
The array into negative 
* / 
#include <stdio.h> 
 void NEG ( int ARR [], int size) { 
     int Val = 0 ; 
     for (Val = 0 ; Val <size; Val ++ ) { 
        ARR [Val] = 0 - ARR [Val]; 
    } 
} 

int main () {
     int ARR [ . 5 ] = { . 1 , 2 , . 3 , . 4 , . 5 }; 
    NEG (ARR, . 5 ); 
     for (int val = 0;val < 5;val++) {
        printf("%d ", arr[val]); 
    } 
    printf("\n"); 
}