Day 2 of Programming in C

Write a program to swap two values


        #include <stdio.h>
        void main() {
            int a, b;
            printf("Enter the value of a : ");
            scanf("%d", &a);
            printf("Enter the value of b : ");
            scanf("%d", &b);
            
            a = a + b;
            b = a - b;
            a = a - b;
            
            printf("After Swapping the values\na = %d\nb = %d", a, b);
        }
Step 1: Declare two integer variables `a, b`.
Step 2: Take user input for both values.
Step 3: Swap values using arithmetic operations without a third variable:
• a = a + b (store sum in a)
• b = a - b (get original a value in b)
• a = a - b (get original b value in a)
Step 4: Print the swapped values.

Write a program to take a 5 digit number input and print its reverse


    #include <stdio.h>
    void main() {
        int n, rev = 0;
        printf("Enter a 5 digit number : ");
        scanf("%d", &n);

        rev = (rev * 10) + (n % 10);
        n = n / 10;
        rev = (rev * 10) + (n % 10);
        n = n / 10;
        rev = (rev * 10) + (n % 10);
        n = n / 10;
        rev = (rev * 10) + (n % 10);
        n = n / 10;
        rev = (rev * 10) + (n % 10);
        n = n / 10;

        printf("The reversed number is %d", rev);
}
Step 1: Declare variables `n` for input and `rev` for storing reversed number.
Step 2: Take user input for the 5-digit number.
Step 3: Extract each digit using modulo (%) and division (/) operations.
Step 4: Build reversed number by multiplying by 10 and adding each digit.
Step 5: Print the reversed number.

Write a program to input the 3 sides of triangle and print its area


            #include <stdio.h>
            #include <math.h>
            void main()
            {
                float a, b, c, s;
                printf("Enter the first side of the triangle : ");
                scanf("%f", &a);
                printf("Enter the second side of the triangle : ");
                scanf("%f", &b);
                printf("Enter the third side of the triangle : ");
                scanf("%f", &c);
            
                s = (a + b + c) / 2;
            
                printf("Area of the triangle is %f", sqrt(s * (s - a) * (s - b) * (s - c)));
            }
Step 1: Declare float variables `a, b, c` for sides and `s` for semi-perimeter.
Step 2: Take user input for all three sides.
Step 3: Calculate semi-perimeter using formula `s = (a + b + c) / 2`.
Step 4: Calculate and print area using Heron's formula: `√(s(s-a)(s-b)(s-c))`.

Write a program to take input cartesian coordinate and print its corresponding polar coordinate


            #include <stdio.h>
            #include <math.h>
            void main()
            {
                int x, y;
                printf("Enter the x-coordinate : ");
                scanf("%d", &x);
                printf("Enter the y-coordinate : ");
                scanf("%d", &y);
            
                printf("The polar form of (%d,%d) is (%f,%f)", x, y, sqrt((x * x) + (y * y)), atan(y / x));
            }
Step 1: Declare integer variables `x, y` for cartesian coordinates.
Step 2: Take user input for x and y coordinates.
Step 3: Calculate radius `r = √(x² + y²)`.
Step 4: Calculate angle `θ = arctan(y/x)` and print both values.

Write a program to take a character input and print its ASCII value


            #include <stdio.h>
            void main()
            {
                char c;
                printf("Enter a character : ");
                c = getchar();
                printf("The ASCII Value for %c is %d", c, c);
            }
Step 1: Declare a character variable `c`.
Step 2: Take character input using `getchar()`.
Step 3: Print both the character and its ASCII value using `%c` and `%d` format specifiers.

Write a program to take a 5 digit number input and print the sum of its first and last digit


            #include <stdio.h>
            void main()
            {
                int n;
                printf("Enter a 5 digit number : ");
                scanf("%d", &n);
                printf("The first digit of the number is %d\nThe last digit of the number is %d", n / 10000, n % 10);
            }
Step 1: Declare an integer variable `n`.
Step 2: Take user input for 5-digit number.
Step 3: Get first digit using `n/10000` and last digit using `n%10`.
Step 4: Print both digits.

Write a program to take 10 floating inputs and print their mean, variance and standard deviation


            #include <stdio.h>
            #include <math.h>
            void main()
            {
                float v1 = 1.1, v2 = 2.2, v3 = 3.3, v4 = 4.4, v5 = 5.5, v6 = 6.6, v7 = 7.7, v8 = 8.8, v9 = 9.9, v10 = 10.10;
                float mean, var, std_dev;
            
                mean = (v1 + v2 + v3 + v4 + v5 + v6 + v7 + v8 + v9 + v10) / 10.0;
                var = ((v1 - mean) * (v1 - mean) +
                       (v2 - mean) * (v2 - mean) +
                       (v3 - mean) * (v3 - mean) +
                       (v4 - mean) * (v4 - mean) +
                       (v5 - mean) * (v5 - mean) +
                       (v6 - mean) * (v6 - mean) +
                       (v7 - mean) * (v7 - mean) +
                       (v8 - mean) * (v8 - mean) +
                       (v9 - mean) * (v9 - mean) +
                       (v10 - mean) * (v10 - mean)) /
                      10;
                std_dev = sqrt(var);
                printf("Mean = %f\nVariance = %f\nStandard Deviation = %f", mean, var, std_dev);
            }
Step 1: Declare variables for 10 values and result storage.
Step 2: Calculate mean by summing all values and dividing by 10.
Step 3: Calculate variance using the formula: Σ(x-μ)²/n.
Step 4: Calculate standard deviation as square root of variance.
Step 5: Print all three statistical measures.
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