0721 c++笔记

1.长整型

#include <iostream>
using namespace std;
int main() {
    int a = 125;//定义整型变量a
    long long b = 241748364856789;//定义长整型变量b
    cout << a << endl << b;//输出变量的值
}

格式:long long 变量名1，变量名2，……

long long a,b,……

2.char(ascii码表)

#include <iostream>
using namespace std;
int main(){
    //输入数字65，得到字符"A"
    char a ;
    a = 97;
    cout<<a;
    return 0;
}

#include <iostream>
using namespace std;
int main(){
    int a=25,b=31;
    float h;//定义浮点型变量h
    h=a*b/2.0;
cout<<h;
    return 0;
}

顺序结构

#include <iostream>
using namespace std;
int main() {
    int s = 52, c = 686;
    float p;
    p = s * 1.0 / c * 100;
    cout << p<<"%";
    return 0;
}