Patterns in Dart

 import 'dart:io';


/// Parameters to find
/// Number of Outer loop runs = Total number of Rows will count in desired pattern
/// Number of Inner loop runs = Total number of Columns will count in desired pattern
/// What to print = stdout.write(" ");

void main() {
  /// Pattern 1
  // for (int i = 1; i <= 5; i++) {     //Outer loop
  //   for (int j = 1; j <= 5; j++) {   //Inner loop
  //     stdout.write("* ");           //In Output, number of rows are 5 so that Outer loop will be i=5(five) times loop
  //   }                        //In Output, number of Columns are 5 so that Inner loop will be j=5(five) times loop
  //   stdout.write("\n");     //Logic: Number of Rows = value of "i" in Outer loop
  // }                  //Logic: Number of Columns = value of "j" in Inner loop

  //Output should be:
  //  * * * * *
  //  * * * * *
  //  * * * * *
  //  * * * * *
  //  * * * * *

  ///NOTE : If Row's number is repeated constantly then Outer loop variable "i" will print(stdout.write("i")) and
  ///When Column's number is repeated constantly then Inner loop variable "j" will print(stdout.write("j"))
  ///   Pattern 2
  ////In Output, every Row's number is constantly repeated so that "i" will print multiple times
  // for (int i = 1; i <= 5; i++) {
  //   for (int j = 1; j <= 5; j++) {
  //     stdout.write("$i");
  //   }
  //   stdout.write("\n");
  // }

  //Output: 1 1 1 1 1
  //        2 2 2 2 2
  //        3 3 3 3 3
  //        4 4 4 4 4
  //        5 5 5 5 5

  ///   Pattern 3
  //  //In Output, every Column's number is constantly repeated(increasing Figure) and Row's number is constantly
  //  increasing(changing) So that "j"(inner loop) will print multiple times
  // for(int i=1; i<=5; i++) {
  //   for(int j=1; j<=5; j++) {
  //     stdout.write("$j");
  //   }
  //   stdout.write("\n");
  // }

  //Output: 1 2 3 4 5
  //        1 2 3 4 5
  //        1 2 3 4 5
  //        1 2 3 4 5
  //        1 2 3 4 5

  ///   Pattern 4
  //In Output, every Column's number is constantly repeated(decreasing Figure) and Row's number is constantly
  //decreasing(changing) So that "j"(inner loop) will print multiple times
  //  for(int i=5; i>=1; i--) {
  //     for(int j=5; j>=1; j--) {
  //       stdout.write(j);
  //     }
  //     stdout.write("\n");
  //   }

  ///   Pattern 5
  // char  i, j;
  // for(i="A"; i<="E"; i++) {
  //   for(j="A"; j<="E"; j++) {
  //     stdout.write(i);
  //   }
  //   stdout.write("\n");
  // }

  //OUTPUT: A A A A A
  //        B B B B B
  //        C C C C C
  //        D D D D D
  //        E E E E E

  ///   Pattern 6
  // int i,j;
  // for(int i=1; i<=5; i++) {
  //   for(int j=1; j<=i; j++) {
  //     stdout.write("* ");
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: *
  //        * *
  //        * * *
  //        * * * *
  //        * * * * *

  ///   Pattern 7
  // for(int i=1; i<=5; i++) {
  //   for(int j=1; j<=i; j++) {
  //     stdout.write(i);
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: 1
  //        22
  //        333
  //        4444
  //        55555

  ///   Pattern 8
  // for(int i=1; i<=5; i++) {
  //   for(int j=1; j<=i; j++) {
  //     stdout.write(j);
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: 1
  //        12
  //        123
  //        1234
  //        12345

  ///   Pattern 9
  // for(int i=1; i<5; i++) {
  //   for(int j=5; j>i; j--) {
  //     stdout.write("* ");
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: * * * * *
  //        * * * *
  //        * * *
  //        * *
  //        *

  ///   Pattern 10
  // for(int i=1; i<=5; i++) {
  //   for(int j=5; j>=i; j--) {
  //     stdout.write(i);
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: 11111
  //        2222
  //        333
  //        44
  //        5

  ///   Pattern 11
  // for(int i=1; i<=5; i++) {
  //   for(int j=5; j>=i; j--) {
  //     stdout.write(j);
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: 54321
  //        5432
  //        543
  //        54
  //        5

  ///   Pattern 12
  // for(int i=5; i>=1; i--) {
  //   for(int j=1; j<=i; j++) {
  //     stdout.write(i);
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: 55555
  //        4444
  //        333
  //        22
  //        1

  ///   Pattern 13
  // for(int i=5; i>=1; i--) {
  //   for(int j=1; j<=i; j++) {
  //     stdout.write(j);
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: 12345
  //        1234
  //        123
  //        12
  //        1

  ///   Pattern 14
  ///   In C language programming
  // for(int i=1; i<=5; i++) {
  //   for(int j=5; j>=i; j--) {
  //     printf("%c",i+65);
  //   }
  //   printf("\n");
  // }
  //OUTPUT: A A A A A
  //        B B B B
  //        C C C
  //        D D
  //        E

  ///   Pattern 15
  // int i,s,j,n = 5;
  // for(i=1; i<=n; i++) {          //Outer loop
  //   for(s=n-1; s>=i; s--) {      //Space loop
  //     stdout.write(" ");
  //   }
  //   for(j=1; j<=i; j++) {        //Inner print loop
  //     stdout.write("*");
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: *
  //       **
  //      ***
  //     ****
  //    *****

  ///   Pattern 16
  int i,s,j,n = 5;
  for(i=1; i<=n; i++) {
    for(s=n-1; s>=i; s--) {
      stdout.write(" ");
    }
    for(j=1; j<=i; j++) {
      stdout.write("* ");
    }
    stdout.write("\n");
  }
  //OUTPUT: *
  //      *   *
  //    *   *   *
  //  *   *   *   *
  //*   *   *   *   *

  ///   Pattern 17
  // int i,s,j,n = 5;
  // for(i=1; i<=n; i++) {
  //   for(s=n-1; s>=i; s--) {
  //     stdout.write(" ");
  //   }
  //   for(j=1; j<=i; j++) {
  //     stdout.write(i);
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: 1
  //       22
  //      333
  //     4444
  //    55555

  ///   Pattern 18
  // int i,j,s,n = 5;
  // for(i=1; i<=n; i++) {
  //   for(s=n-1; s>=i; s--) {
  //     stdout.write(" ");
  //   }
  //   for(j=1; j<=i; j++) {
  //     stdout.write(j);
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: 1
  //       12
  //      123
  //     1234
  //    12345

  ///   Pattern 19
  // int i,j,s,n = 5;
  // for(i=1; i<=n; i++) {
  //   for(s=n-1; s>=i; s--) {
  //     stdout.write(" ");
  //   }
  //   for(j=1; j<=i; j++) {
  //     stdout.write("$j ");
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT:     1
  //          1   2
  //        1   2   3
  //      1   2   3   4
  //    1   2   3   4   5

  ///   Pattern 20
  // int i,j,s,n = 5;
  // for(i=n; i>=1; i--) {
  //   for(s=n-1; s>=i; s--) {
  //     stdout.write(" ");
  //   }
  //   for(j=1; j<=i; j++) {
  //     stdout.write("*");
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: *****
  //         ****
  //          ***
  //           **
  //            *

  ///   Pattern 21
  // int i,j,s,n = 5;
  // for(i=n; i>=1; i--) {
  //   for(s=n-1; s>=i; s--) {
  //     stdout.write(" ");
  //   }
  //   for(j=1; j<=i; j++) {
  //     stdout.write("* ");
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: *   *   *   *   *
  //          *   *   *   *
  //            *   *   *
  //              *   *
  //                *

  ///   Pattern 22
  // int i,j,s,n = 5;
  // for(i=n; i>=1; i--) {
  //   for(s=n-1; s>=i; s--) {
  //     stdout.write(" ");
  //   }
  //   for(j=1; j<=i; j++) {
  //     stdout.write("$i ");
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: 5   5   5   5   5
  //          4   4   4   4
  //            3   3   3
  //              2   2
  //                1

  ///    Pattern 23
  // int i,j,s,n = 5;
  // for(i=n; i>=1; i--) {
  //   for(s=n-1; s>=i; s--) {
  //     stdout.write(" ");
  //   }
  //   for(j=1; j<=i; j++) {
  //     stdout.write("$j ");
  //   }
  //   stdout.write("\n");
  // }
  //OUTPUT: 1   2   3   4   5
  //          1   2   3   4
  //            1   2   3
  //              1   2
  //                1

  ///   Pattern 24
  // int i,j,n = 5;
  // for(i=1; i<=n; i++) {
  //   for(j=n; j>=1; j--) {
  //     if(i>=j) {
  //       stdout.write("* ");
  //     } else {
  //       stdout.write(" ");
  //     }
  //     stdout.write("\n");
  //   }
  // }

}

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