Beginner · C PROGRAMMING

Variables and types

What you will learn

Store whole numbers, decimal values and characters.

Understand the concept

A variable has a type and a value. int stores integers, double stores floating-point values and char stores a character. printf uses format specifiers that must match the supplied argument types: %d for int, %f for double and %c for a character.

Read the example

The complete program appears below. Read it first, predict the output, then run it.

Expected output

Quantity: 3, price: 125.50, grade: A

Practise

Add a variable for total cost and print quantity multiplied by price.

Common mistake

Do not read an uninitialized variable. Single quotes represent a character; double quotes represent a string.

Lesson discussion

#include <stdio.h>

int main(void) {
    int quantity = 3;
    double price = 125.50;
    char grade = 'A';
    printf("Quantity: %d, price: %.2f, grade: %c\n", quantity, price, grade);
    return 0;
}

PRACTICE LAB

Read. Edit. Run.

C source · .c

Experiment with the program below. Your code and input are sent to the selected compiler only when you run it.

Compiler

C source

Tab indents · Shift+Tab unindents · Esc then Tab leaves the editor · Ctrl/Cmd+Enter runs · Ctrl/Cmd+S saves a draft

Changes save automatically to your account.

Standard input

Input / output example

Example input

No input required.

Expected output for the original program

Quantity: 3, price: 125.50, grade: A

Output will appear here.

Variables and types

What you will learn

Understand the concept

Read the example

Expected output

Practise

Common mistake

Lesson discussion

Read. Edit. Run.

Input / output example

Debugging Lab

Interactive Memory Visualizer

Stack frames

Memory and pointers

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