fmt 格式化输出 C++

//头文件
#include "spdlog/fmt/ostr.h"
//小数点输出
 fmt::print("name is {:.2f}n",1.2356);
 //输出小数会四舍五入
 name is 1.24


//格式化输出个数

//输出6位不足补空格
fmt::print("name is {:6}n",1);
//输出
name is      1

//输出6位不足在前补0
fmt::print("name is {:0>6}n",1);
//输出
name is 000001

//输出7位不足在两侧补0，居中输出
fmt::print("name is {:0^7}n",1);
//输出
name is 0001000

//输出6位不足在后补0
fmt::print("name is {:0<6}n","a");
//输出
name is 100000
    
    
//使用位置参数{}
fmt::print("name is {},age is {}n","a",21);
fmt::print("name is {1},age is {0}n",21,"a");
//输出
name is a,age is 21
name is a,age is 21


//使用别名参数
string name = "a";
auto age = 12.12; 
fmt::print("name is {name},age is {age},her love {name} and he age is {age}n",fmt::arg("name",name),fmt::arg("age",age));
 //输出
 name is a,age is 12.12,her love a and he age is 12.12

//头文件
#include "spdlog/fmt/chrono.h"

fmt::print("strftime-like format: {:%H:%M:%S}n", 3h + 15min + 30s);
//输出
strftime-like format: 03:15:30

//头文件
#include "spdlog/fmt/ranges.h"

    vector S1;
    S1.push_back("太空人1");
    S1.push_back("太空人2");
    S1.push_back("太空人3");
    S1.push_back("太空人4");
    const char *S2[] = 
    {
        "我是测试1",
        "我是测试2",
        "我是测试3",
        "我是测试4"
    };
    int DD[3]={1,2,3};
    fmt::print("string is {}n",S1);
    fmt::print("string is {}n",S2);
    fmt::print("string is {}n",DD);

//输出
string is ["太空人1", "太空人2", "太空人3", "太空人4"]
string is ["我是测试1", "我是测试2", "我是测试3", "我是测试4"]
string is [1, 2, 3]

auto S1 = fmt::format("{:.2f}",age);//S1值为string类型