The second day of learning C language

Judge

#include <stdio.h>

int main()
{
    printf("%d\n", 5 == 3);
    printf("%d\n", 5 > 3);
    printf("%d\n", 5 <= 3);

    return 0;

// Everything from the back to the end is ignored by the computer ,// The following is for comments

/**/ In the middle of the slash is the comment

A multiline comment consists of a pair of character sequences " / * " Start , And then ” * / “ end .

Nested IF function

if（gameover==0){

if(player2move==2)

printf("Your turn\n");

}else

printf("GAME OVER\n");

To be in IF and else Followed by parentheses

Switch-case

int type;
    scanf("%d", &type);

switch (type) {
    case 1:
        printf(" Hello ");
        break;
    case 2:
        printf(" Good morning ");
        break;
    case 3:
        printf(" Good evening ");
        break;
    case 4:
        printf(" bye ");
        break;
    default:
        printf(" ah , What ah? ？");
    }

break： Is to jump out to the output （ Can only jump out of the loop ）

continue： Skip this round of the loop and the rest of the statements go to the next round （ Can only jump out of the loop ）

The algorithm of the number of digits

1. User input x;

2. initialization n by 0;

3.x = x / 10, Take out the bits ;

4.n++;

5. If x>0, go back to 3;

otherwise n It's the result

 int x;
    int n = 0;
    scanf("%d", &x);
    n++;
    x  = 10;
    while (x > 0) {
        n++;
        x  = 10;
    }
    printf("%d\n", n);
 

DO-while

do

{

< Loop body statement >

}while(< Loop statement >);

IF It's disposable ;

while It's repeated ;

#include<stdio.h>
const int MINOR = 35;

int age = 0;

printf(" Please enter your age ：");
scanf("%d", &age);

printf(" Your age is %d year .\n,age");
if (age < MINOR) {
    printf(" Youth is beautiful ,");

}
printf(" Age determines your spiritual world , Cherish it .\n");
 

goto< name >

name ： 

goto: Jump directly to the location of the name