The formal and practical parameters of C language

One-shape participation Argument

1). define

Formal Parameter: Formal Parameters.

When defining a function, the parameter that is written at the back of the Letter's parentheses is called the formal argument

arguments: actual Parameters.

When calling a function, the argument that is written after the Function's parentheses is called the Arguments.

2). Note

A. An argument can be either a constant, a variable, or an expression; a formal parameter: it can actually be understood as a local variable of the Function.

B. Argument-to-parameter values, in fact, is equivalent to assigning a parameter (local Variable) to a function

C. Value passing: changes the value of a parameter within a function without affecting the outside argument

D. in the C language, all types, except arrays, are passed value as argument passing

Two-parameter function

function definition syntax with parameters:

void function name (type parameter Name) {

function body;

}

Application Scenario: When a function has to pass some data to the outside of a function, use parameters

Tips: code examples are as follows

#include <stdio.h>

/*

* Determine if a number is a narcissus number

*/

void Isflower (int Num) {

int Bai = num/100;

int Shi = num/10% 10;

int GE = num% 10;

If hundred * hundred * ten * ten * ten + A * each is equal to this number

If (bai*bai*bai + Shi*shi*shi + Ge*ge*ge = = Num) {

Is the number of daffodils

printf ("%d is the number of daffodils \ n", num);

}else{

otherwise, It's not Narcissus number.

printf ("%d is not narcissus number \ n", num);

}

}

2. Write a function that specifies the sum of all integers between a number and a number

Such as: 3 to 8, calculate the 3+4+5+6+7+8 =?

void Getn2msum (int n,int m) {

int sum = 0;

If (n < M) {//n smaller than M case

For (int i=n; i<=m; I++) {

Sum + = i;

}

}else{//m is smaller than n

For (int i=m; i<=n; I++) {

Sum + = i;

}

}

printf ("%d to%d and%d\n", n,m,sum);

}

3, Use the function to determine whether a year is a leap years

void Isrunyear (int Year) {

If (year% 400 ==0 | | (year%4==0 && Year%100!=0)) {

printf ("%d years is a leap year \ n";

}else{

printf ("%d is common year \ n", year);

}

}

int main (int argc, const char * Argv[]) {

Call syntax: function name (argument list);

Isflower (200);

Getn2msum (100,1);//10+11+12....+20

Isrunyear (1900);

Return 0;

}

The formal and practical parameters of C language