C Programming Codes

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Hollow Square Star Pattern

#include <stdio.h>

int main() {
  int n;
  scanf("%d", &n);

  for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
      if (i == 0 || i == n - 1 || j == 0 || j == n - 1) {
        printf("*");
      } else {
        printf(" ");
      }
    }
    printf("\n");
  }
  return 0;
}

Multiplication Table with Break and Continue

#include <stdio.h>

int main() {
    int rows = 5, cols = 5;

    for (int i = 1; i <= rows; i++) {
        for (int j = 1; j <= cols; j++) {
            if (i == 3 && j == 2) {
                continue;
            }
            if (i == 4 && j == 4) {
                break;
            }
            printf("%d * %d = %d\t", i, j, i * j);
        }
        printf("\n");
    }
    return 0;
}

Detect Duplicate Input Using While Loop

#include <stdio.h>

int main() {
    int num, prevNum = -1;
    while (1) {
        printf("Enter a number: ");
        scanf("%d", &num);
        if (num == prevNum) {
            printf("Duplicate detected: %d\n", num);
            break;
        }
        prevNum = num;
    }
    return 0;
}

Reverse Number Printing with do-while Loop

#include <stdio.h>

int main() {
  int n;
  scanf("%d", &n);
  do {
    printf("%d ", n);
    n--;
  } while (n >= 1);
  printf("\n");
  return 0;
}

Print Alphabets A to Z using While Loop

#include <stdio.h>

int main() {
 char alphabet = 'A';

 while (alphabet <= 'Z') {
 printf("%c ", alphabet);
 alphabet++;
 }

 printf("\n");
 return 0;
}

Even and Odd Numbers using While Loop

#include <stdio.h>

int main() {
  int N, i = 1;
  printf("Enter the value of N: ");
  scanf("%d", &N);

  printf("Even numbers: ");
  while (i <= N) {
    if (i % 2 == 0) {
      printf("%d ", i);
    }
    i++;
  }
  printf("\n");

  i = 1;
  printf("Odd numbers: ");
  while (i <= N) {
    if (i % 2 != 0) {
      printf("%d ", i);
    }
    i++;
  }
  printf("\n");
  return 0;
}

Guessing Game (do-while Loop)

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
    int number, guess, attempts = 0;
    srand(time(0));
    number = rand() % 100 + 1;

    do {
        printf("Guess a number between 1 and 100: ");
        scanf("%d", &guess);
        attempts++;

        if (guess > number) {
            printf("Too high!\n");
        } else if (guess < number) {
            printf("Too low!\n");
        } else {
            printf("Correct! You guessed in %d attempts.\n", attempts);
        }
    } while (guess != number);

    return 0;
}

Diamond Star Pattern

#include <stdio.h>

int main() {
  int rows, i, j, space;
  rows = 5;

  for (i = 1; i <= rows; i++) {
    for (space = i; space < rows; space++)
      printf(" ");
    for (j = 1; j <= (2 * i - 1); j++)
      printf("*");
    printf("\n");
  }

  for (i = rows - 1; i >= 1; i--) {
    for (space = i; space < rows; space++)
      printf(" ");
    for (j = 1; j <= (2 * i - 1); j++)
      printf("*");
    printf("\n");
  }

  return 0;
}

Inverted Pyramid Pattern (Nested Loops)

#include <stdio.h>

int main() {
  int rows, i, j, space;

  rows = 5;

  for (i = rows; i >= 1; --i) {
    for (space = 0; space < rows - i; ++space)
      printf("  ");

    for (j = i; j <= 2 * i - 1; ++j)
      printf("* ");

    for (j = 0; j < i - 1; ++j)
      printf("* ");

    printf("\n");
  }

  return 0;
}

Right-Angle Star Pyramid (Nested Loops)

#include <stdio.h>

int main() {
 int rows, i, j;
 scanf("%d", &rows);
 for (i = 1; i <= rows; i++) {
 for (j = 1; j <= i; j++) {
 printf("*");
 }
 printf("\n");
 }
 return 0;
}

Pascal's Triangle (Loops)

#include <stdio.h>

int main() {
    int rows, i, j, space, number = 1;
    printf("Enter number of rows: ");
    scanf("%d", &rows);

    for (i = 0; i < rows; i++) {
        for (space = 1; space <= rows - i; space++)
            printf("  ");

        for (j = 0; j <= i; j++) {
            if (j == 0 || i == 0)
                number = 1;
            else
                number = number * (i - j + 1) / j;

            printf("%4d", number);
        }
        printf("\n");
    }
    return 0;
}

Floyd's Triangle (for loop)

#include <stdio.h>

int main() {
  int rows, num = 1;
  scanf("%d", &rows);

  for (int i = 1; i <= rows; i++) {
    for (int j = 1; j <= i; j++) {
      printf("%d ", num);
      num++;
    }
    printf("\n");
  }
  return 0;
}

Multiplication Table (for loop)

#include <stdio.h>

int main() {
  int n, i;
  printf("Enter a number: ");
  scanf("%d", &n);

  for (i = 1; i <= 10; i++) {
    printf("%d * %d = %d\n", n, i, n * i);
  }
  return 0;
}

Count Digits in a Number (do-while Loop)

#include <stdio.h>

int main() {
  int num, count = 0;
  printf("Enter an integer: ");
  scanf("%d", &num);

  if (num == 0) {
    count = 1;
  } else {
    do {
      num /= 10;
      count++;
    } while (num != 0);
  }

  printf("Number of digits: %d\n", count);
  return 0;
}

Sum of Digits (While Loop)

#include <stdio.h>

int main() {
  int num, sum = 0, digit;

  scanf("%d", &num);

  while (num > 0) {
    digit = num % 10;
    sum += digit;
    num /= 10;
  }

  printf("%d", sum);

  return 0;
}

Do-While Wonders: Number Printing Unleashed! 🚀

#include <stdio.h>

int main() {
  int n, i = 1;
  printf("Enter a number: ");
  scanf("%d", &n);

  do {
    printf("%d ", i);
    i++;
  } while (i <= n);

  printf("\n");
  return 0;
}

Unlocking Number Sequences: Your First C Loop!

#include <stdio.h>

int main() {
  int n, i = 1;
  printf("Enter a number: ");
  scanf("%d", &n);
  while (i <= n) {
    printf("%d ", i);
    i++;
  }
  printf("\n");
  return 0;
}

Loop-de-Loop: Number Patterns with For!

#include <stdio.h>

int main() {
  int n, i;
  printf("Enter a number: ");
  scanf("%d", &n);
  for (i = 1; i <= n; i++) {
    printf("%d ", i);
  }
  printf("\n");
  return 0;
}

printed in each row. - `printf("\n")` moves the cursor to the next line after each row is printed. 💡 Tip: Start by identifying the relationship between the row number and the number of characters to print in each row. This will help you determine the loop conditions. Visualizing the output is also very helpful! More Pattern Examples: 1. **Square Pattern:**

#include <stdio.h>

int main() {
    int size = 5;
    for (int i = 0; i < size; i++) {
        for (int j = 0; j < size; j++) {
            printf("* ");
        }
        printf("n");
    }
    return 0;
}

2. **Inverted Right-Angled Triangle:**

#include <stdio.h>

int main() {
    int rows = 5;
    for (int i = rows; i >= 1; i--) {
        for (int j = 1; j <= i; j++) {
            printf("* ");
        }
        printf("n");
    }
    return 0;
}

Practice Tips: - Start with simple patterns and gradually increase the complexity. - Break down the pattern into rows and columns. - Identify the relationship between the row and column numbers and the characters to be printed. - Draw the pattern on paper first to visualize the output. Practice Problems: - Print a hollow square pattern. - Print a diamond pattern. - Print a pyramid pattern. - Print patterns with numbers or characters instead of ''. 🎉 Congratulations! You've taken the first steps into the world of loops and patterns in C. Keep practicing, and you'll be amazed at what you can create! Remember practice makes perfect. 👨‍💻