Beginner Level (Level 1)

1.Write a program to print “Hello, World!” on the screen.

2.Write a program to add two integers.

3.Write a program to find the largest of two numbers.

4.Program to check if a number is even or odd.

5.Program to find the sum of first 10 natural numbers.

6. Program to print multiplication table of 5.

7.Program to calculate factorial of a number (e.g., 5).

8.Program to find whether a character is a vowel or consonant.

9. Program to swap two numbers.

10.Program to calculate the square of a number.

ANS OF ALL QUESTION

cCopyEdit#include <stdio.h>
int main() {
    printf("Hello, World!\n");
    return 0;
}

Explanation:

  • #include <stdio.h> allows us to use input-output functions.
  • printf prints the message to the console.
  • \n moves the cursor to the next line.

cCopyEdit#include <stdio.h>
int main() {
    int a = 10, b = 20;
    int sum = a + b;
    printf("Sum = %d\n", sum);
    return 0;
}

Explanation:
Two integers are declared and added. %d is used for integer output.

cCopyEdit#include <stdio.h>
int main() {
    int a = 10, b = 25;
    if (a > b)
        printf("%d is larger\n", a);
    else
        printf("%d is larger\n", b);
    return 0;
}

Explanation:
Simple if-else logic checks which number is larger.

cCopyEdit#include <stdio.h>
int main() {
    int num = 5;
    if (num % 2 == 0)
        printf("Even\n");
    else
        printf("Odd\n");
    return 0;
}

Explanation:
An even number leaves remainder 0 when divided by 2.

cCopyEdit#include <stdio.h>
int main() {
    int sum = 0;
    for (int i = 1; i <= 10; i++)
        sum += i;
    printf("Sum = %d\n", sum);
    return 0;
}

Explanation:
A for loop adds numbers from 1 to 10.

cCopyEdit#include <stdio.h>
int main() {
    int num = 5;
    for (int i = 1; i <= 10; i++)
        printf("%d x %d = %d\n", num, i, num * i);
    return 0;
}

Explanation:
A loop multiplies 5 with values from 1 to 10.

cCopyEdit#include <stdio.h>
int main() {
    int num = 5, fact = 1;
    for (int i = 1; i <= num; i++)
        fact *= i;
    printf("Factorial = %d\n", fact);
    return 0;
}

Explanation:
Factorial is calculated by multiplying numbers from 1 to num.

cCopyEdit#include <stdio.h>
int main() {
    char ch = 'e';
    if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
        printf("Vowel\n");
    else
        printf("Consonant\n");
    return 0;
}

Explanation:
Use logical OR to check against all vowels.

cCopyEdit#include <stdio.h>
int main() {
    int a = 5, b = 10, temp;
    temp = a;
    a = b;
    b = temp;
    printf("a = %d, b = %d\n", a, b);
    return 0;
}

Explanation:
Using a temporary variable, values are exchanged.

cCopyEdit#include <stdio.h>
int main() {
    int num = 7;
    int square = num * num;
    printf("Square = %d\n", square);
    return 0;
}

Explanation:
Square of a number is the number multiplied by itself.

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