char ch='g',str[20];
sprintf( str, "abcdef%c", a );
printf( "%s", str );
打印的结果就是：
abcdefg
c/c++字符转换成字符串
以下方法来源于网络，整理出来和初学者一起学习，举例：
1.
2.
3.void chcat( char *str, char ch )
{
int len;
len = strlen(str);
str[len] = ch;
str[len+1] = 0;
}
直接在字符串末尾添加字符。
新手编程实例----生成wifi密码字典的C++代码：
// my_dic.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
#include <stdio.h>
using namespace std;
const string path1 = "C:\\Users\\TheKing\\Desktop\\dic_1.txt";
const string path2 = "C:\\Users\\TheKing\\Desktop\\dic_2.txt";
const string path3 = "C:\\Users\\TheKing\\Desktop\\dic_3.txt";
const string path4 = "C:\\Users\\TheKing\\Desktop\\dic_4.txt";
const string path5 = "C:\\Users\\TheKing\\Desktop\\dic_5.txt";
const string path2_1 = "C:\\Users\\TheKing\\Desktop\\dic2_1.txt";
const string path2_2 = "C:\\Users\\TheKing\\Desktop\\dic2_2.txt";
const string path2_3 = "C:\\Users\\TheKing\\Desktop\\dic2_3.txt";
const string path2_4 = "C:\\Users\\TheKing\\Desktop\\dic2_4.txt";
const string path2_5 = "C:\\Users\\TheKing\\Desktop\\dic2_5.txt";
char tel[12] = {'1','8','3','7','1'};
char tel2_1[13] = {'0','1','8','3','7','1'};
char tel2_2[14] = {'0','0','1','8','3','7'};
char tel2_3[15] = {'0','0','0','1','8','3''};
char tel2_4[16] = {'0','0','0','0','1','8'};
void c_dic1() //末尾一个字母
{
ofstream fout(path1);
if(fout)
cout<<"Create C:\\Users\\TheKing\\Desktop\\dic_1.txt sucessful "<<endl;
else
cout<<"FAILED create dic1!"<<endl;
char head = 20; //41~122 = 81
if(!fout)
{
cout<<"Open Failed "<<endl;
cout<<endl;
}
else
{ cout<<"Open Successed dic1"<<endl;
for(int i = 0;i<106;i++)
{
head += 1;
tel[11] = head;
string str(tel,12);
fout<<str<<endl;
}
}
fout.close(); //关闭流文件
cout<<endl;
}
void c_dic2() //末尾一个字母
{
ofstream fout(path2);
if(fout)
cout<<"Create C:\\Users\\TheKing\\Desktop\\dic_2.txt sucessful "<<endl;
else
cout<<"FAILED create dic2!"<<endl;
char head1 = 20; //41~122 = 81
char head2 = 20;
int i = 0,j = 0;
if(!fout)
{
cout<<"Open Failed "<<endl;
cout<<endl;
}
else
{ cout<<"Open Successed dic2"<<endl;
for(i = 0;i<106;i++)
{
head1 += 1;
tel[11] = head1;
for(j = 0;j<106;j++)
{
head2 += 1;
tel[12] = head2;
string str(tel,13);
fout<<str<<endl;
}
head2 = 20;
}
}
fout.close(); //关闭流文件
cout<<endl;
}
void c_dic3() //末尾一个字母
{
ofstream fout(path3);
if(fout)
cout<<"Create C:\\Users\\TheKing\\Desktop\\dic_3.txt sucessful "<<endl;
else
cout<<"FAILED create dic3!"<<endl;
char head1 = 20; //41~122 = 81
char head2 = 20;
char head3 = 20;
int i = 0,j = 0,k = 0;
if(!fout)
{
cout<<"Open Failed "<<endl;
cout<<endl;
}
else
{ cout<<"Open Successed dic3"<<endl;
for(i = 0;i<106;i++)
{
head1 += 1;
tel[11] = head1;
for(j = 0;j<106;j++)
{
head2 += 1;
tel[12] = head2;
for(k = 0;k<20;k++)
{
head3 += 1;
tel[13] = head3;
string str(tel,14);
fout<<str<<endl;
}
head3 = 20;
}
head2 = 20;
}
}
fout.close(); //关闭流文件
cout<<endl;
}
void c_dic4() //末尾一个字母
{
ofstream fout(path4);
if(fout)
cout<<"Create C:\\Users\\TheKing\\Desktop\\dic_4.txt sucessful "<<endl;
else
cout<<"FAILED create dic4!"<<endl;
char head1 = 64; //41~122 = 81
char head2 = 64;
char head3 = 64;
char head4 = 64;
int i = 0,j = 0,k = 0,l = 0;
if(!fout)
{
cout<<"Open Failed "<<endl;
cout<<endl;
}
else
{ cout<<"Open Successed dic3"<<endl;
for(i = 0;i<64;i++)
{
head1 += 1;
tel[11] = head1;
for(j = 0;j<64;j++)
{
head2 += 1;
tel[12] = head2;
for(k = 0;k<64;k++)
{
head3 += 1;
tel[13] = head3;
for(l = 0;l<32;l++)
{
head4 += 1;
tel[14] = head4;
string str(tel,15);
fout<<str<<endl;
}
head4 = 64;
}
head3 = 64;
}
head2 = 64;
}
}
fout.close(); //关闭流文件
if(!fout)
{
cout<<"Open Failed "<<endl;
cout<<endl;
}
else
{ cout<<"Open Successed dic3"<<endl;
for(i = 0;i<64;i++)
{
head1 += 1;
tel[11] = head1;
for(j = 0;j<64;j++)
{
head2 += 1;
tel[12] = head2;
for(k = 0;k<64;k++)
{
head3 += 1;
tel[13] = head3;
for(l = 32;l<64;l++)
{
head4 += 1;
tel[14] = head4;
string str(tel,15);
fout<<str<<endl;
}
head4 = 64;
}
head3 = 64;
}
head2 = 64;
}
}
fout.close(); //关闭流文件
cout<<endl;
}
void c_dic5() //末尾一个字母
{
ofstream fout(path5);
if(fout)
cout<<"Create C:\\Users\\TheKing\\Desktop\\dic_5.txt sucessful "<<endl;
else
cout<<"FAILED create dic5!"<<endl;
char head1 = 96; //41~122 = 81
char head2 = 96;
char head3 = 96;
char head4 = 96;
char head5 = 96;
int i = 0,j = 0,k = 0,l = 0,m = 0;
if(!fout)
{
cout<<"Open Failed "<<endl;
cout<<endl;
}
else
{ cout<<"Open Successed dic5"<<endl;
//fout.close(); //关闭流文件
for(i = 0;i<26;i++)
{
head1 += 1;
tel[11] = head1;
for(j = 0;j<26;j++)
{
head2 += 1;
tel[12] = head2;
for(k = 0;k<26;k++)
{
head3 += 1;
tel[13] = head3;
for(l = 0;l<26;l++)
{
head4 += 1;
tel[14] = head4;
for(m = 0;m<26;m++)
{
head5 += 1;
tel[15] = head5;
string str(tel,16);
fout<<str<<endl;
}
head5 = 96;
}
head4 = 96;
}
head3 = 96;
}
head2 = 96;
}
}
fout.close(); //关闭流文件
cout<<endl;
}
void c_dic2_1() //末尾一个字母
{
ofstream fout(path2_1);
if(fout)
cout<<"Create C:\\Users\\TheKing\\Desktop\\dic2_1.txt sucessful "<<endl;
else
cout<<"FAILED create dic2_1!"<<endl;
char head = 64; //41~122 = 81
if(!fout)
{
cout<<"Open Failed "<<endl;
cout<<endl;
}
else
{ cout<<"Open Successed dic2_1"<<endl;
for(int i = 0;i<64;i++)
{
head += 1;
tel2_1[0] = head;
string str(tel2_1,12);
fout<<str<<endl;
}
}
fout.close(); //关闭流文件
cout<<endl;
}
void c_dic2_2() //末尾一个字母
{
ofstream fout(path2_2);
if(fout)
cout<<"Create C:\\Users\\TheKing\\Desktop\\dic2_2.txt sucessful "<<endl;
else
cout<<"FAILED create dic2_2!"<<endl;
char head1 = 64; //41~122 = 81
char head2 = 64;
int i = 0,j = 0;
if(!fout)
{
cout<<"Open Failed "<<endl;
cout<<endl;
}
else
{ cout<<"Open Successed dic2_2"<<endl;
for(i = 0;i<64;i++)
{
head1 += 1;
tel2_2[0] = head1;
for(j = 0;j<64;j++)
{
head2 += 1;
tel2_2[1] = head2;
string str(tel2_2,13);
fout<<str<<endl;
}
head2 = 64;
}
}
fout.close(); //关闭流文件
cout<<endl;
}
void c_dic2_3() //末尾一个字母
{
ofstream fout(path2_3);
if(fout)
cout<<"Create C:\\Users\\TheKing\\Desktop\\dic2_3.txt sucessful "<<endl;
else
cout<<"FAILED create dic2_3!"<<endl;
char head1 = 96; //41~122 = 81
char head2 = 96;
char head3 = 96;
int i = 0,j = 0,k = 0;
if(!fout)
{
cout<<"Open Failed "<<endl;
cout<<endl;
}
else
{ cout<<"Open Successed dic2_3"<<endl;
for(i = 0;i<26;i++)
{
head1 += 1;
tel2_3[0] = head1;
for(j = 0;j<26;j++)
{
head2 += 1;
tel2_3[1] = head2;
for(k = 0;k<26;k++)
{
head3 += 1;
tel2_3[2] = head3;
string str(tel2_3,14);
fout<<str<<endl;
}
head3 = 96;
}
head2 = 96;
}
}
fout.close(); //关闭流文件
cout<<endl;
}
void c_dic2_4() //末尾一个字母
{
ofstream fout(path2_4);
if(fout)
cout<<"Create C:\\Users\\TheKing\\Desktop\\dic2_4.txt sucessful "<<endl;
else
cout<<"FAILED create dic4!"<<endl;
char head1 = 96; //41~122 = 81
char head2 = 96;
char head3 = 96;
char head4 = 96;
int i = 0,j = 0,k = 0,l = 0;
if(!fout)
{
cout<<"Open Failed "<<endl;
cout<<endl;
}
else
{ cout<<"Open Successed dic3"<<endl;
for(i = 0;i<26;i++)
{
head1 += 1;
tel2_4[0] = head1;
for(j = 0;j<26;j++)
{
head2 += 1;
tel2_4[1] = head2;
for(k = 0;k<26;k++)
{
head3 += 1;
tel2_4[2] = head3;
for(l = 0;l<26;l++)
{
head4 += 1;
tel2_4[3] = head4;
string str(tel2_4,15);
fout<<str<<endl;
}
head4 = 96;
}
head3 = 96;
}
head2 = 96;
}
}
fout.close(); //关闭流文件
}
int main()
{
//c_dic1();
//c_dic2();
//c_dic3();
//c_dic4();
//c_dic5();
//c_dic2_1();
//c_dic2_2();
c_dic2_3();
c_dic2_4();
system("pause");
}
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