Assigning Values to Variables

In the C programming language, assigning values to variables involves creating a variable of a specific data type and then assigning a value to it using the assignment operator =. Below are examples of how to assign values to variables in C:

1. Declaration and Initialization

You can declare a variable and assign a value to it at the same time.

int a = 10;    // Integer variable initialized to 10
float b = 3.14; // Float variable initialized to 3.14
char c = 'A';   // Char variable initialized to 'A'

2. Separate Declaration and Assignment

You can declare a variable first and assign a value to it later.

int x;      // Declare an integer variable
x = 20;     // Assign value 20 to the variable

3. Assigning Values Using Expressions

Variables can also be assigned values using expressions.

int x = 5;
int y = 10;
int z = x + y; // z is assigned the result of x + y (15)

4. Using Constants

You can use constants for assignment to ensure immutability.

const int MAX_VALUE = 100; // MAX_VALUE cannot be changed later

5. Pointer Assignments

For pointers, you assign memory addresses.

int a = 10;
int *ptr = &a; // ptr is assigned the address of a

6. Compound Assignment Operators

C supports compound assignment operators like +=, -=, *=, etc.

int num = 10;
num += 5;  // Equivalent to num = num + 5; num becomes 15
num *= 2;  // Equivalent to num = num * 2; num becomes 30

#include <stdio.h>
int main() {
    int x;          // Declaration
    x = 10;        // Assignment
    printf("Value of x: %d", x);
    return 0;
}