return_type function_name( parameter list )
{
body of the function
}
/ * Function returns the larger of the two numbers number * /
int max ( int num1, int num2)
{
/ * local variable declarations * /
int Result;
IF (num1> num2)
Result = num1;
the else
Result = num2;
return Result;
}
#include <stdio.h> / * function declarations * / int max ( int num1, int num2); int main ()
{ / * local variables defined * / int A = 100 ;
int B = 200 is ;
int RET; / * call the function to get the maximum value * /
RET = max (a, B);
the printf ( " max value iS:% D \ n- " , RET); return 0 ;
} / * function returns the larger of the two numbers in the number of * / int max ( int
num1, int num2)
{
/ * local variable declarations * /
int Result;
IF (num1> num2)
Result = num1;
the else
Result = num2;
return Result;
}
/ * Function definition * /
void the swap ( int x, int y)
{
int TEMP;
TEMP = x; / * save the value of x * /
x = y; / * the y assigned to x * /
y = TEMP; / * temp assigned to the Y * /
return ;
}
#include <stdio.h> / * function declarations * / void the swap ( int X, int Y); int main ()
{ / * local variables defined * / int A = 100 ;
int B = 200 is ;
the printf ( " exchange before , the value of a:% D \ n- " , a);
the printf ( " before the exchange, b value:% D \ n- " , b); / * invoke the function to exchange value * /
the swap (a, b);
the printf ( " after the exchange, the value of a:% d \ n " , a);
the printf ( " after the exchange, b value:% d \ n
", b );
return 0;
}
/ * Function definition * /
void the swap ( int * x, int * y)
{
int TEMP;
TEMP = * x; / * save the value of the address of x * /
* x = * y; / * the y assigned to x * /
Y = temp *; / * the temp assigned to Y * /
return ;
}
#include <stdio.h> / * function declarations * / void the swap ( int * X, int * Y); int main ()
{ / * local variables defined * / int A = 100 ;
int B = 200 is ;
the printf ( " before the exchange, the value of a:% D \ n- " , a);
the printf ( " before the exchange, b value:% D \ n- " , b); / * invoke the function to exchange value
* & a represents pointing a pointer, i.e., the address of a variable
* & b to point b represents a pointer, i.e. the address of the variable b * /
the swap ( & a, & b);
the printf (
" After the exchange, the value of a:% D \ n- ' , a);
the printf ( " After the exchange, b value:% D \ n- ' , b);
return 0 ;
}