int2char'n char2int in C++

gistfile1.cpp

//from int to char
while(n>0){
	ch[i]=(n%10)+'0';
	n=n/10;
	i++;
}
while(i>0){
	putchar(ch[i-1]);
	i--
}
//from char to int
while(ch >= '0' && ch <= '9')
{
n=(n<<3)+(n<<1)+ch-'0',ch=getchar()
}