Algorithm for Problem Solving

Swapping Two Values

Use another variable to store the value of variable1 then replace the value of variable1 with value of variable2, then replace the value of variable2 with value of the temporary variable.

Finding Biggest Number Between Two Numbers

Use a variable 'big' to store the larger value. Compare the two numbers and assign the larger one to 'big'.

if (variable1 > variable2) {
  big = variable1;
} else {
  big = variable2;
}

Fahrenheit (°F) to Celsius (°C) Conversion

Use the formula: cel = 5/9 * (fahrenheit - 32)

float fahrenheit = 98.6;
float celsius = (5.0 / 9.0) * (fahrenheit - 32);

Sum of First n Natural Numbers

Initialize sum to 0 and use a loop to accumulate the sum of numbers from 1 to n.

int n = 10;
int sum = 0;
int i = 1;

while (i <= n) {
  sum += i;
  i++;
}

Factorial of n (Product of First n Natural Numbers)

Initialize product to 1 and use a loop to multiply numbers from 1 to n.

int n = 5;
int product = 1;
int i = 1;

while (i <= n) {
  product *= i;
  i++;
}

Reverse Digits of a Number

Use modulo operation to get last digit and build the reversed number.

int n = 123;
int reversed = 0;

while (n > 0) {
  int lastDigit = n % 10;
  reversed = reversed * 10 + lastDigit;
  n = n / 10;
}

Swapping Numbers Without Temporary Variable

a = a + b;
b = a - b;
a = a - b;

Finding Element in an Array

int arr[10] = {1,2,3,4,5,6,7,8,9,10};
int searchElement = 6;

for(int i = 0; i <= 9; i++) {
  if(arr[i] == searchElement) {
    printf("Found %d at index %d\n", searchElement, i);
  }
}

Bubble Sort Algorithm

int arr[10] = {9,10,3,2,1,7,5,8,4,6};
int size = 10; 
int temp;

for(int i = 0; i < size - 1; i++) {
  for(int j = 0; j < size - i - 1; j++) {
    if(arr[j] > arr[j+1]) {
      temp = arr[j];
      arr[j] = arr[j+1];
      arr[j+1] = temp;
    }
  }
}

for(int k = 0; k < size; k++) {
  printf("%d ", arr[k]);
}