Question

求C语言和C++大神解答，printf怎么转成cout输出语句

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "GFSString.h"
void main() {
FString s,s2;
s = " abc abc";
s += " test ";
printf("Trim : '%s'\n",s.Trim());
s = s.Trim();
printf("[3] : '%c'\n",s[3]); //输出字符s[3]
printf("Replace : '%s'\n",s.Replace("c","cdef")); //输出 s.Replace("c","cdef")的值
printf("Format : '%s'\n",s.Format("1:%s; 2:%d","One",123));
s = "book"; //输出 s.Format("1:%s; 2:%d","One",123)的值
s2 = "cat";
printf("'book' < 'cat': %s\n",(s < s2) ? "True" : "False");
s = s2;
printf("Copy 'cat' to s: %s\n", s);
}

Answer 1

cout输出不需要指定输出的格式类型，其他的和printf一样的,

endl 表示换行,当然 \n也还是可以用的. cout << "\n"

cout << "Trim : "<< s.Trim()  << endl;            

cout << "[3] : " <<s[3] << endl;    //输出字符s[3]

cout <<"Replace:"<< s.Replace("c","cdef")<<endl; //输出 s.Replace("c","cdef")的值 

cout <<"Format : "<< s.Format("1:%s; 2:%d","One",123) << endl ;    
cout <<"'book' < 'cat':"  << (s < s2) ? "True" : "False") << endl; 
cout << "Copy 'cat' to s:" <<  s << endl;

Answer 2

printf("a=",a);
转换成count<<"a=="<<a<<endl;

追问

printf("Format : '%s'\n",s.Format("1:%s; 2:%d","One",123));那这句呢？？？

追答

count<<"Format :"<<s.Format("1:%s; 2:%d","One",123)<<endl;

Answer 3

百度一下，cout格式输出