1. Write a c program to display your Name, address and city in different lines.in C Language

#include<stdio.h>

int main() {

char Name[100], Address[100], City[100];

// Input Name, Address and City...

printf("Enter your Name: ");

fgets(Name, sizeof(Name), stdin);

printf("Enter your Address: ");

fgets(Address, sizeof(Address), stdin);

printf("Enter your City: ");

fgets(City, sizeof(City), stdin);

printf("---Displaying all the information below---");

printf("\nName: %s", Name);

printf("Address: %s", Address);

printf("City: %s", City);

return 0;

}


CODE:- Tested- Works.

Write a program to print multiplication table of 10 in reversed order. in C Language

 My mistakes:-

1. couldn't figure out CONDITION. just i ( ZERO OR NONE)

// Write a program to print multiplication table of 10 in reversed order.

#include <stdio.h>

int main()

{

    int n;

    scanf("%d", &n);

    for( int i = 10; i ; i--) // for(initialize; conditon; increment or decrement)

    {

        printf("%d x %d = %d\n", n, i, n*i);

    }

   

    return 0;

}

First sum of natural numbers in C language

The actual calculation behind:-

1. while(i<=n) {

    sum = sum + i;

    i++;

}

or

2. for(i = 1; i<=n; i++) {
sum += i; // sum = sum + i;
}

advantages of for loop:-
-  more easier.
- makes code concise and more clean.

// First sum of natural numbers in C language

#include <stdio.h>

int main() {

    int n, sum = 0; /// sum = 0 stores the number in memory

    printf("Enter your first N natural number: ");

    scanf("%d", &n);

    

    // Using a loop to calculate the sum

    // for(int i = 1; i <= n; i++) {

    //     printf("%d\n", i);

    //     sum += i;

    // }

    sum = (n*(n+1))/2;

    

    printf("The first sum of %d Natural numbers are: %d\n", n, sum);

    

    

    return 0;

}

FORMULA:- 

 Check whether a number is Prime Number or not

Mistakes:- 

Theory-wise:- I didn't knew what is Prime Numbers:

**Prime Number:- Divisible by 1 and itself only.

Composite Number:- Divisible by 1 and itself as well as other numbers too.

 Table of any given number in C language

Mistakes:-

1.) I put "if" instead of "for" loop which led to a huge error in the beginning.

if loop:- 

- if (condition) { // Code to be executed if the condition is true }

**for loop:-

- for (initialization; condition; update){

}

-initializes a value once then tests the condition after each iteration, 

-stops when condition is false.

2.) after putting the loop control statement, i forgot to put {  }

// Table of any given number upto 10.

#include <stdio.h>

int main() {

    // Declare the variables num, n

   int num, n;

// User enters the value of any given number

printf("Enter the value:- ");

scanf("%d", &num);

//Shows which table is being printed

printf("\nThe table of %d", num);

for (n = 1;n <= 10; n++) // for is initialization, condition, increment

{

// Prints the table upto 10 

printf("\n%d x %d = %d", num, n, num*n);

}

    return 0;

}

Palindromic Number checker with C

 Mistakes:- 

1. 1. i forgot to put } before "else" statement.
2. Logic: Store original, then compare original == reversed.

1. Key Operations: Use % to extract digits, / to remove digits, and *10 to build reversed.
2. Important: Preserve original for comparison.

Tip:-  Always close if block with } before starting an else block.

correct:- if (condition) { /* Code */ } else { /* Code */ }

#include <stdio.h>

int main() {

    int n, original, reversed = 0, remainder;

    printf("Enter the integer: ");  // Input the integer value

    scanf("%d", &n);

    // Store the original value of n

    original = n;

    // Get the reversed value of the number

    while (n != 0) {

        remainder = n % 10;          // Get the last digit

        reversed = reversed * 10 + remainder;  // Build the reversed number

        n /= 10;                     // Remove the last digit

    }

    // Check if the original number is equal to the reversed number

    if (original == reversed) {

        printf("The number is a Palindrome.\n");

    } else {

        printf("The number is not a Palindrome.\n");

    }

    return 0;

}

C- Operator and their uses with examples

1. Unary Operator

a) num-- means decrement of 5 to 4 as an example! :)

// Online C compiler to run C program online

#include <stdio.h>

int main() {

   int num = 5;

   

   printf("The value of 5 before decrement is:- %d", num);

   printf("\nThe value of 5 using decrement is:- %d", num--);

   printf("\nThe value of 5 after decrement is:- %d", num);

   

    return 0;

}

OUTPUT:-

The value of 5 before decrement is:- 5

The value of 5 using decrement is:- 5

The value of 5 after decrement is:- 4

=== Code Execution Successful ===

b) num++ is the vice-e-versa of num--

// Online C compiler to run C program online

#include <stdio.h>

int main() {

   int num = 5;

   

   printf("The value of 5 before decrement is:- %d", num);

   printf("\nThe value of 5 using decrement is:- %d", num++);

   printf("\nThe value of 5 after decrement is:- %d", num);

   

    return 0;

}

OUTPUT :-

The value of 5 before decrement is:- 5

The value of 5 using decrement is:- 5

The value of 5 after decrement is:- 6

=== Code Execution Successful ===