c读取一行字符串,以及c++读取一行字符串的实例

一 c读取一行字符串

1 gets

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

int main()
{
 int size = 1024;
 char* buff = (char*)malloc(size);

 // read lines
 while(NULL != gets(buff)){
 printf("Read line with len: %d\n", strlen(buff));
 printf("%s", buff);
 }

 // free buff
 free(buff);
}

利用getchar()读取一个个字符来读取一行

#include <stdio.h>
#include <stdlib.h>

int my_getline(char* line, int max_size)
{
 int c;
 int len = 0;
 while( (c = getchar()) != EOF && len < max_size ){
 line[len++] = c;
 if('\n' == c)
  break;
 }


 line[len] = '\0';
 return len;
}

int main()
{
 int max_size = 1024;
 char* buff = (char*)malloc( sizeof(char) * max_size );

 //getline
 int len;
 while(0 != (len = my_getline(buff, max_size))){
 printf("Read line with len: %d\n", len);
 printf("%s", buff);
 }

 free(buff);
}

二 c++读取一行字符串

cin.get()和cin.getline()
#include<iostream>

using namespace std;

int main()
{

 cout << "----------getline忽略'\\n-----------------" << endl;
 char str0[30], str1[30];
 cin.getline(str0, 30);
 cin.getline(str1, 30);
 cout << "str0:" << str0 << endl;
 cout << "str1:" << str1 << endl;

 cout << "---------利用get()消除get()遗留下来的'\\n'-------" << endl;
 char str2[30], str3[30];
 cin.get(str2, 30).get(); // 注意这里！
 cin.get(str3, 30).get();
 cout << "str1: " << str2 << endl;
 cout << "str2: " << str3 << endl;

 cout << "--------没消除get()遗留下来的'\\n'就被下一个get()读取了，所以str5输出为空-----" << endl;
 char str4[30], str5[30];
 cin.get(str4, 30); // 注意这里！
 cin.get(str5, 30);
 cout << "str4: " << str4 << endl;
 cout << "str5: " << str5 << endl;
 return 0;

}

以上这篇c读取一行字符串,以及c++读取一行字符串的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/qq_16949707/article/details/71440875