c++输入输出

这是一个调试程序

#include<iostream>
using namespace std;

class Solution {
public:
void replaceSpace(char *str,int length) {
if(str == NULL || length<=0)
return;
int length_origin = 0;
int blank = 0;
while(*str != '\0'){
if(*str == ' '){
blank++;
length_origin++;
str++;
}
else{
length_origin++;
str++;
continue;
}
}
cout<<'a'<<endl;
int length_new = length_origin+2*blank;
cout<<'a'<<endl;
if(length_new > length)
return;
else{cout<<'b'<<endl;
char *str_new = str+2*blank;
cout<<'b'<<endl;
while(str_new != str){
if(*str == ' '){
*str_new = '0';
*(str_new-1) = '2';
*(str_new-2) = '%';
str_new = str_new -3;
str--;
}
else{
*str_new =*str;
str_new--;
str--;
}
}
}
}
};
int main(){
// cout<<'a';
char str[] = "we are happy";
cout<<str<<endl;
Solution replace;
replace.replaceSpace(str,50);
cout<<'a';
cout<<'a'<<endl;
cout<<'a'<<endl;
cout<<str<<endl;
return 0;
}

输出的效果为：

we are happy
a
a
b
b
aa
a
we%20are%20happy

c++的输入输出是cin，cout

cout后面加endl会在输出后加一个回车‘\n’，若不加endl，下面的输出会接着上面一个输出后面