C Language Basics C 语言基础

Syntax, Operators, Control Flow & Arrays 语法、运算符、控制流与数组

#include <stdio.h>

int main(void) {
    // This is a comment
    printf("Hello World!\n");
    return 0;
}

int

Integers (whole numbers)整数

int score = 100;

double

Decimal numbers小数 (双精度)

double pi = 3.14159;

char

Single character单个字符

char grade = 'A';

int age = 20;
printf("I am %d years old\n", age);

Format specifiers:格式占位符: %d (int), %lf (double), %c (char), %s (string)

int number;
scanf("%d", &number);

⚠️ Don't forget the & (address of) operator!不要忘记 & (取地址符)!