# 04 - C Output - Display Text and Values
**URL:** https://buzzly.harislab.tech/t/04-c-output-display-text-and-values/192
**Category:** C Programming Tutorials
**Tags:** c, basics
**Created:** [April 21, 2026, 1:42pm UTC](https://buzzly.harislab.tech/t/04-c-output-display-text-and-values/192 "2026-04-21T13:42:17Z")
**Posts on this page:** 1
**Showing post:** 1
### Author:  [@Haris](https://buzzly.harislab.tech/u/Haris)
#### Post date: [April 21, 2026, 1:42pm UTC](https://buzzly.harislab.tech/t/04-c-output-display-text-and-values/192/1 "2026-04-21T13:42:18Z")
**Learn how to display output on the screen using printf()**
* * *
## What is this topic?
This guide explains C Output - Display Text and Values in simple terms, what it does, and how to use it in real C programs.
## Why We Need It
- It helps you write correct and reliable C code.
- It makes your programs easier to read and maintain.
- It is used in real projects and interviews.
- It reduces common beginner mistakes.
- It builds a strong foundation for advanced topics.
## Use Cases
- Building practical C programs step by step.
- Solving real coding tasks with clean logic.
- Preparing for exams, interviews, and projects.
- Understanding and improving existing C code.
* * *
## What is Output?
Output is information your program sends to the screen. The most common way to create output in C is using the `printf()` function.
### Simple Output Example
```c
#include
int main() {
printf("Hello, World!");
return 0;
}
```
**Output:**
```auto
Hello, World!
```
* * *
## The printf() Function
`printf()` stands for “print formatted” and displays text on the screen.
### Basic Syntax
```c
printf("text to display");
```
### Examples
#### Example 1: Simple Text
```c
#include
int main() {
printf("I am learning C!");
return 0;
}
```
**Output:**
```auto
I am learning C!
```
#### Example 2: Multiple printf Statements
```c
#include
int main() {
printf("First line");
printf("Second line");
return 0;
}
```
**Output:**
```auto
First lineSecond line
```
Notice how they printed on the same line? We need to add a newline!
* * *
## Newlines: \n
The `\n` character creates a new line.
```c
#include
int main() {
printf("First line\n");
printf("Second line\n");
return 0;
}
```
**Output:**
```auto
First line
Second line
```
### More Escape Sequences
| Sequence | Effect |
| --- | --- |
| `\n` | New line |
| `\t` | Tab (space) |
| `\\` | Backslash |
| `\"` | Double quote |
| `\'` | Single quote |
* * *
## Printing Numbers and Variables
Use format specifiers to print numbers:
### Format Specifiers
| Specifier | Data Type | Example |
| --- | --- | --- |
| `%d` | Integer | `printf("%d", 42);` |
| `%f` | Float (decimal) | `printf("%f", 3.14);` |
| `%c` | Character | `printf("%c", 'A');` |
| `%s` | String | `printf("%s", "text");` |
### Example: Printing an Integer
```c
#include
int main() {
int age = 25;
printf("I am %d years old\n", age);
return 0;
}
```
**Output:**
```auto
I am 25 years old
```
### Example: Printing a Float
```c
#include
int main() {
float price = 19.99;
printf("Price: $%f\n", price);
return 0;
}
```
**Output:**
```auto
Price: $19.990000
```
Notice the extra zeros! To fix this, use `%.2f`:
```c
printf("Price: $%.2f\n", price); // Shows 2 decimal places
```
**Output:**
```auto
Price: $19.99
```
* * *
## Practical Examples
### Example 1: Personal Information
```c
#include
int main() {
char name[] = "John";
int age = 25;
float height = 5.9;
printf("Name: %s\n", name);
printf("Age: %d\n", age);
printf("Height: %.1f\n", height);
return 0;
}
```
**Output:**
```auto
Name: John
Age: 25
Height: 5.9
```
### Example 2: Simple Math Results
```c
#include
int main() {
int result = 10 + 5;
printf("10 + 5 = %d\n", result);
float division = 15.0 / 4.0;
printf("15 / 4 = %.2f\n", division);
return 0;
}
```
**Output:**
```auto
10 + 5 = 15
15 / 4 = 3.75
```
* * *
## Multiple Values
Print multiple values with one printf:
```c
#include
int main() {
int x = 10;
int y = 20;
printf("x = %d, y = %d\n", x, y);
return 0;
}
```
**Output:**
```auto
x = 10, y = 20
```
* * *
## Common Mistakes
### Mistake 1: Forgetting the Newline
```c
printf("Line 1");
printf("Line 2"); // Prints on same line
```
**Fix:**
```c
printf("Line 1\n");
printf("Line 2\n");
```
### Mistake 2: Wrong Format Specifier
```c
int age = 25;
printf("Age: %f\n", age); // ✗ %f is for floats, not ints
```
**Fix:**
```c
printf("Age: %d\n", age); // ✓ %d is for integers
```
### Mistake 3: Missing Variable
```c
printf("My number: %d\n"); // ✗ No value provided
```
**Fix:**
```c
printf("My number: %d\n", 42); // ✓ Value provided
```
* * *
## Quick Reference: Format Specifiers
```c
printf("%d", integer); // Integer
printf("%.2f", decimal); // Decimal (2 places)
printf("%c", character); // Single character
printf("%s", string); // String of text
```
* * *
## Practice Exercise
Create a file called `output.c`:
```c
#include
int main() {
printf("=== Welcome ===\n");
printf("My name is John\n");
printf("I love programming!\n");
int score = 95;
float grade = 4.0;
printf("\nScore: %d\n", score);
printf("Grade: %.1f\n", grade);
return 0;
}
```
Compile and run:
```bash
gcc output.c -o output
./output
```
* * *
### 📚 Navigation
| Previous | Next |
| --- | --- |
| [← C Syntax](https://buzzly.harislab.tech/t/03-c-syntax-understanding-program-structure/191/1) | [C Comments →](https://buzzly.harislab.tech/t/05-c-comments-writing-helpful-code-notes/193/1) |
* * *
## ❓ Have Questions?
**Comment below and we’ll help you!** Struggling with printf? Share your questions below!
* * *
---
_[View the full topic](https://buzzly.harislab.tech/t/04-c-output-display-text-and-values/192)._