Run C Program in Terminal

Introduction

The usual workflow is edit source in a file, invoke the compiler from a shell, then launch the binary it produces.

Understanding the topic

Write source Save code as program.c

Compile gcc program.c -o program (creates executable named program)

Run ./program on Unix/macOS or program.exe on Windows

• Write source — Save code as program.
• Compile — gcc program.
• Run — Run.

Step-by-step explanation

1. Write source — Save code as program.
2. Compile — gcc program.
3. Run — Run.

Informative example

Example program:

#include <stdio.h>

int main(void) {
    printf("Built from the shell\n");
    return 0;
}

Built from the shell

Execution workflow

Best practices

• Enable warnings: gcc -Wall -Wextra -std=c11 source.c -o app
• Give every variable a defined value before it is read.
• Stay inside array bounds — C will not stop you from over-running a buffer.

Common mistakes

• Reading uninitialized storage — behavior is undefined.
• Dismissing compiler warnings instead of fixing root causes.
• Ignoring NULL returns from malloc, fopen, and similar APIs.

Hands-on exercise

Practice problems:

• Compile with -Wall flag
• Pass command-line arguments to main

Summary

Run C Program in Terminal in C — Save source, compile to a binary, and execute it from the command line.