Let us C

Type Casting

Pravesh Agrawal — Sat, 02 Dec 2023 11:29:22 +0000

#include 

int main() {
    // Type casting
    double doubleVar = 3.14;
    int intVar;

    intVar = (int)doubleVar;

    printf("Double: %lf\n", doubleVar);
    printf("Int: %d\n", intVar);

    return 0;
}

Size of Data Types

Pravesh Agrawal — Sat, 02 Dec 2023 11:29:08 +0000

#include 

int main() {
    // Size of data types
    printf("Size of int: %lu bytes\n", sizeof(int));
    printf("Size of float: %lu bytes\n", sizeof(float));
    printf("Size of char: %lu bytes\n", sizeof(char));

    return 0;
}

Constants and Enums

Pravesh Agrawal — Sat, 02 Dec 2023 11:28:54 +0000

#include 

// Enum for days of the week
enum Days { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday };

int main() {
    // Constants and enums
    const double PI = 3.14159;
    enum Days today = Wednesday;

    printf("Value of PI: %f\n", PI);
    printf("Today is day number: %d\n", today);

    return 0;
}

User Input and Type Conversion

Pravesh Agrawal — Sat, 02 Dec 2023 11:28:40 +0000

#include 

int main() {
    // User input and type conversion
    int num1, num2;
    float result;

    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);

    result = (float)num1 / num2;

    printf("Result of division: %f\n", result);

    return 0;
}

Character Input and Output

Pravesh Agrawal — Sat, 02 Dec 2023 11:27:09 +0000

#include 

int main() {
    // Character input and output
    char ch;

    printf("Enter a character: ");
    scanf(" %c", &ch);  // Note the space before %c to consume any leading whitespace

    printf("You entered: %c\n", ch);

    return 0;
}

Multiple Inputs and Outputs

Pravesh Agrawal — Sat, 02 Dec 2023 11:26:48 +0000

#include 

int main() {
    // Multiple inputs and outputs
    int num1, num2, sum;

    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);

    sum = num1 + num2;

    printf("Sum: %d\n", sum);

    return 0;
}

String Input and Output

Pravesh Agrawal — Sat, 02 Dec 2023 11:26:28 +0000

#include 

int main() {
    // String input and output
    char name[50];

    printf("Enter your name: ");
    scanf("%s", name);

    printf("Hello, %s!\n", name);

    return 0;
}

Input and Output with Floating-Point Numbers

Pravesh Agrawal — Sat, 02 Dec 2023 11:26:13 +0000

#include 

int main() {
    // Input and output with floating-point numbers
    float floatNumber;

    printf("Enter a floating-point number: ");
    scanf("%f", &floatNumber);

    printf("You entered: %f\n", floatNumber);

    return 0;
}

Logical AND/OR in If-Else

Pravesh Agrawal — Sat, 02 Dec 2023 11:25:01 +0000

#include 

int main() {
    // Logical AND/OR in if-else
    int age;
    char gender;

    printf("Enter your age: ");
    scanf("%d", &age);

    printf("Enter your gender (M/F): ");
    scanf(" %c", &gender);  // Note the space before %c to consume any leading whitespace

    if (age >= 18 && gender == 'M') {
        printf("You are an adult male.\n");
    } else if (age >= 18 && gender == 'F') {
        printf("You are an adult female.\n");
    } else {
        printf("You are not an adult.\n");
    }

    return 0;
}

Ternary Operator

Pravesh Agrawal — Sat, 02 Dec 2023 11:24:38 +0000

#include 

int main() {
    // Ternary operator
    int num1, num2, max;

    printf("Enter two numbers: ");
    scanf("%d %d", &num1, &num2);

    max = (num1 > num2) ? num1 : num2;

    printf("Maximum number: %d\n", max);

    return 0;
}