我用getline读取了一个文件，并且想要将char c [0]传输到int，我遇到了一个错误。
error: invalid conversion from ‘char’ to ‘const char*’ [-fpermissive]
g[n].chicken = atoi(c[0]);
^
在assign.cpp中包含的文件中：5：0： /usr/include/stdlib.h:147:12：错误：初始化“ int atoi（const char *）”的参数1 [-fpermissive] extern int atoi（const char * __ nptr）
24 int g;
25 string str;
26 while(getline(file,str)){
27
28 const char* ct = str.c_str();
29 char c[5];
30 strcpy(c,ct);
31
32
33 g = atoi(c[0]);
答案 0 :(得分：0)
atoi的声明如下：// Initialize Firebase
var config = {
apiKey: "AIzaSyBZHH97LQ42n7j0fBjKR7LCLXkeDq-L7iw",
authDomain: "pro-core-169202.firebaseapp.com",
databaseURL: "https://pro-core-169202.firebaseio.com",
projectId: "pro-core-169202",
storageBucket: "pro-core-169202.appspot.com",
messagingSenderId: "58388231689"
};
firebase.initializeApp(config);
let dataRef = firebase.database().ref("data");
document.getElementById("patiatint").addEventListener("submit", submitform);
function submitform(e) {
e.preventDefault();
let name = getInputVal("name");
let medicName = getInputVal("medic-name");
let medicTime1 = getInputVal("medic-time1");
let medicTime2 = getInputVal("medic-time2");
let notes = getInputVal("notes");
saveData(name, medicName, medicTime1, medicTime2, notes);
}
function getInputVal(id) {
return document.getElementById(id).value;
}
function saveData(name, medicName, medicTime1, medicTime2, notes) {
let newDataRef = dataRef.push();
newDataRef.set({
name: name,
medicName: medicName,
medicTime1: medicTime1,
medicTime2: medicTime2,
notes: notes
});
}
function amTime() {
let amTime = document.getElementById('am');
if (amTime.checked == true) {
document.getElementById("medic-time2").value = "AM";
}
if (amTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function bmTime() {
let bmTime = document.getElementById('bm');
if (bmTime.checked == true) {
document.getElementById("medic-time2").value = "PM";
}
if (bmTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function oneTime() {
let oneTime = document.getElementById('one');
if (oneTime.checked == true) {
document.getElementById("medic-time1").value = "1:00";
}
if (oneTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function twoTime() {
let twoTime = document.getElementById('two');
if (twoTime.checked == true) {
document.getElementById("medic-time1").value = "2:00";
}
if (twoTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function threeTime() {
let threeTime = document.getElementById('three');
if (threeTime.checked == true) {
document.getElementById("medic-time1").value = "3:00";
}
if (threeTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function fourTime() {
let fourTime = document.getElementById('four');
if (fourTime.checked == true) {
document.getElementById("medic-time1").value = "4:00";
}
if (fourTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function fiveTime() {
let fiveTime = document.getElementById('five');
if (fiveTime.checked == true) {
document.getElementById("medic-time1").value = "5:00";
}
if (fiveTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function sixTime() {
let sixTime = document.getElementById('six');
if (sixTime.checked == true) {
document.getElementById("medic-time1").value = "6:00";
}
if (sixTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function sevenTime() {
let sevenTime = document.getElementById('seven');
if (sevenTime.checked == true) {
document.getElementById("medic-time1").value = "7:00";
}
if (sevenTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function eightTime() {
let eightTime = document.getElementById('eight');
if (eightTime.checked == true) {
document.getElementById("medic-time1").value = "8:00";
}
if (eightTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function nineTime() {
let nineTime = document.getElementById('nine');
if (nineTime.checked == true) {
document.getElementById("medic-time1").value = "9:00";
}
if (nineTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function tenTime() {
let tenTime = document.getElementById('ten');
if (tenTime.checked == true) {
document.getElementById("medic-time1").value = "10:00";
}
if (tenTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function elevenTime() {
let elevenTime = document.getElementById('eleven');
if (elevenTime.checked == true) {
document.getElementById("medic-time1").value = "11:00";
}
if (elevenTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
function twelveTime() {
let twelveTime = document.getElementById('twelve');
if (twelveTime.checked == true) {
document.getElementById("medic-time1").value = "12:00";
}
if (twelveTime.checked == false) {
document.getElementById("medic-time1").value = "";
}
}
您需要
int atoi(const char* buffer)因为c是指向字符数组的指针。数组c [5]由5个字节组成。 c [0]是第一个字节。编译器将c本身解释为指向第一个字节的指针。
因此，atoi（）需要一个指向字符数组的指针。您将第一个字符传递给了它。
使用std :: getline（）检索用户输入是一个好主意。学习使用stringstream从getline（）中解析项目。一旦擅长，您将犯的错误更少：
g = atoi(c);