Question

我必须完成这个练习：我必须从通用文本文件中读取，因此组成： [Nameperson] [space] [age]，我必须在结构中保存名称（char）和年龄（unsigned int）。

我的问题是：我不明白如何划分名称和年龄，也就是说，如果我以这种方式使用fread_s

fread_s（pp-＆gt; name，256,1,256，f）;

该程序将我保存为名称es。

Pippo 25iiiiiiiiiiiiiiiiiiiiiiiiii ...

我知道fread_s函数保持读取的最后一个字母的位置，但我不知道如何使用这个对我有利。这是我的代码

#include <stdio.h>
#include <string.h>

struct person{
    char name[256];
    unsigned int age;
};

void person_read(FILE *f, struct person* pp) {
    fread_s(pp->name, 256, 1, 256, f);
}

感谢。

Answer 1

您使用了错误的功能，需要struct person person; if (person_read(file, &person) != 0) do_somethin_read_error(); else fprintf(stderr, "%s has %d years\n", person.name, person.age);

person->name

像这样使用

person->name

您的代码生成该输出的原因是因为您正在读取文件中的所有字节（或仅256 ）到printf()，因为start() function start() { var Engine = Matter.Engine, World = Matter.World, Bodies = Matter.Bodies; Constraint = Matter.Constraint; Render = Matter.Render; var engine = Engine.create(document.body); var body = Bodies.rectangle(200, 20, 200, 40); body.density = 15; var wheelA = Bodies.circle(50,100,40); var wheelB = Bodies.circle(350,100,40); wheelA.density = 10; wheelB.density = 10; var axisAA = Constraint.create({bodyB:wheelA,bodyA:body,pointA:{x:-90,y:-15},pointB:{x:0,y:0},stiffness:0.8}, { isStatic: true }); var axisAB = Constraint.create({bodyB:wheelA,bodyA:body,pointA:{x:-10,y:15},pointB:{x:0,y:0},stiffness:0.2}); var axisBA = Constraint.create({bodyB:wheelB,bodyA:body,pointA:{x:90,y:-15},pointB:{x:0,y:0},stiffness:0.8}); var axisBB = Constraint.create({bodyB:wheelB,bodyA:body,pointA:{x:10,y:15},pointB:{x:0,y:0},stiffness:0.2}); var ground = Bodies.rectangle(400, 610, 810, 60, { isStatic: true }); World.add(engine.world, [body, wheelA, wheelB, axisAA, axisAB, axisBA, axisBB, ground]); document.addEventListener('keydown', function(event) { if(event.keyCode == 39) { Matter.Body.setAngularVelocity(wheelA,0.1); Matter.Body.setAngularVelocity(wheelB,0.1); } else if(event.keyCode == 37) { Matter.Body.setAngularVelocity(wheelA,-0.1); Matter.Body.setAngularVelocity(wheelB,-0.1); } }); Engine.run(engine); }不是< em> null 终止，将其传递给open(url)会产生您看到的输出，并且是*未定义的行为**。

Fread_s保存特定单词？

1 个答案: