In C, data types define the type and size of data a variable can store — like integers, characters, or floating-point numbers. They're essential for memory efficiency and type safety. ??

? Basic Data Types in C

char letter = 'A';

• Stored as ASCII value ('A' = 65)

? Floating Point Types

c
float pi = 3.14f;double g = 9.80665;

? Example Code

c
#include <stdio.h>int main() {    int age = 25;    float height = 5.9;    char grade = 'A';    printf("Age: %d\n", age);    printf("Height: %.1f\n", height);    printf("Grade: %c\n", grade);    return 0;}

? Type Modifiers

C supports modifiers to extend or limit ranges:

• signed, unsigned

• short, long

Example:

c
unsigned int score = 150;long long bigNumber = 123456789012345;

? Summary

• Use the right data type to save memory and avoid bugs

• Combine with sizeof() to check memory size

• Understand type conversions (implicit/explicit)