C Programming Language || Hands On Coding

Skip Specific Values with 'continue' in a Loop

#include <stdio.h>

int main() {
  for (int i = 1; i <= 10; i++) {
    if (i == 5 || i == 7) {
      continue;
    }
    printf("%d ", i);
  }
  printf("\n");
  return 0;
}

Infinite Loops with Break

#include <stdio.h>

int main() {
 int i = 0;
 while (1) {
 printf("%d ", i);
 i++;
 if (i > 9) {
 break;
 }
 }
 printf("\nLoop finished!\n");
 return 0;
}

Print Continuous Character Pattern A-B-C...

#include <stdio.h>

int main() {
 char ch;
 for (ch = 'A'; ch <= 'Z'; ch++) {
 printf("%c", ch);
 if (ch < 'Z') {
 printf("-");
 }
 }
 printf("\n");
 return 0;
}

Number Pyramid Pattern

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

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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;
}