CSC 1750 Nested for Loops

CSC 1750 Nested for Loops Spring 2013

Nested for loops 1 12 123 1234 12345 123456 Start with 1 On each line print same number of chars as line number for (int i = 1; i <= 6; i++) { for (int k = 1; k <= i; k++) { System.out.print(k); } System.out.println(); }

Nested for loops 1 12 123 1234 12345 123456 Start with 1 On each line print same # of chars as line number for (int i = 1; i <= 6; i++) { for (int k = 1; k <= i; k++) { System.out.print(k); } System.out.println(); } Generalize int lines = 10; for (int i = 1; i <= lines; i++) { for (int k = 1; k <= i; k++) { System.out.print(k); } System.out.println(); }

Generalize int lines = 9; for (int i = 1; i <= lines; i++) { for (int k = 1; k <= lines – i + 1; k++) { System.out.print(k); } System.out.println(); } Nested for loops 123456 12345 1234 123 12 1 for (int i = 1; i <= 6; i++) { for (int k = 1; k <= 6 – i + 1; k++) { System.out.print(k); } System.out.println(); }

Generalize int lines = 9; for (int i = 1; i <= lines; i++) { for (int j = 1; j < i; j++) { System.out.print(" "); } for (int k = 1; k <= lines – i + 1; k++) { System.out.print(k); } System.out.println(); } Nested for loops 123456 12345 1234 123 12 1 for (int i = 1; i <= 6; i++) { for (int j = 1; j < i; j++) { System.out.print(" "); } for (int k = 1; k <= 6 – i + 1; k++) { System.out.print(k); } System.out.println(); }

Nested for loops – Pattern 1 1 222 33333 4444444 33333 222 1 // 1. declare & init variables int spaces = 3; int symbol = 1; int charsPerLine = 1; // 2. Print current line // inside outer loop //3. Update variables // for next line: if (i < 4) { spaces -= 1; symbol += 1; charsPerLine += 2; } else { spaces += 1; symbol -= 1; charsPerLine -= 2; } Try to generalize!!

Nested for loops – Pattern 3 //3. Update variables // for next line if (i < 3) { lSpaces += 1; mSpaces -=2; symbol1 = i + 1; symbol2 -= 1; } else { lSpaces -= I; mSpaces += 2; symbol1 = ???; symbol2 = ???; } // 1. declare & init variables int lSpaces = 0; int mSpaces = 3; int symbol1 = 1; int symbol2 = 5; 1 5 2 4 3 2 4 1 5 // 2. Print current line // inside outer loop

CSC 1750 Nested for Loops