C语言零基础笔记1

固定格式

#include<stdio.h>
int main()
{

return 0;
}

必须记住！

printf语句

#include<stdio.h>
int main()
{
 printf("Python is the best language\n");
 printf("Java is the best language\n");
 printf("C++ is the best language\n");
 return 0;
}

运行结果：
Python is the best language
Java is the best language
C++ is the best language

Tips:

1. \n 表示换行
2. \t 表示空格
3. 一定要有双引号
4. 结尾要有分号
5. 最好加上\n

int, float, double, char型数据

整数：int a = 3;
位数少小数：float a = 3.14;
位数多小数：float a = 3.1415;
将变量赋值成某个字母: char a = ‘A’;

Tips:

1. 一句语句可以多次赋值
2. 用逗号分开
   
   
   

练习1

求123与456的和

#include<stdio.h>
int main()
{
 int a, b, sum;
 a = 123;
 b = 456;
 sum = a + b;
 printf("和是%d\n",sum);
 return 0;
}

练习2

对于整型变量是 “%d”
对于小数是 “%f"
对于字符串是 “%c"