Patterns in C++
#include <iostream>
using namespace std;
int main()
{
//normal pattern:
int n;
cout << "Enter the number of entries : ";
cin >> n;
for (int i = 0; i < n; i++)
{
for (int j = 0; j < i + 1; j++)
{
cout<<"*";
}
cout<<endl;
}
cout<<"----------------------------------"<<endl;
//reverse:
for (int i = n; i > 0; i--)
{
for (int j = i; j > 0; j--)
{
cout<<"*";
}
cout<<endl;
}
cout<<"----------------------------------"<<endl;
// staircase:
for(int i = 1; i <= n; i++){
for(int j = 0; j < n-i; j++){
cout<<" ";
}
for(int k = 0; k < i; k++){
cout<<"#";
}
cout<<endl;
}
cout<<"----------------------------------"<<endl;
//ABCD Pattern:
char letters[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
for(int i =0; i < n; i++){
for(int j=0; j< i+1;j++){
cout<<letters[i];
}
cout<<endl;
}
cout<<"----------------------------------"<<endl;
// * *
// ** **
// *** ***
// ********
// --------
// *** ***
// ** **
// * *
/*
There are two bases: One is for upper pattern and the other is for lower pattern.
Three for loops, one is for endlines and the other is for * and the last is for spaces. The spaces are made keeping consideration of blanks left.
*/
for(int i=1;i<n+1;i++){
for(int j=1;j<=i*2;j++){
cout<<"*";
if(j == i ){ //after half make spaces
for(int k =0;k < (2*n - 2*i);k++){
cout<<" "; //till no.of blanks left
}
}
else{
continue;
}
}
cout<<endl;
}
for(int i=n-1;i>=1;i--){ //i -> -1
for(int j=2*i;j>=1;j--){
cout<<"*";
if(j == i+1){ //j -> +1
for(int k =0;k < (2*n - 2*i);k++){
cout<<" ";
}
}
else{
continue;
}
}
cout<<endl;
}
return 0;
}
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