Online C Compiler (GCC 9.2.0)

Getting Started with C Online

C is a powerful, general-purpose programming language developed by Dennis Ritchie at Bell Labs. It forms the backbone of operating systems, embedded systems, and high-performance computing.

Basic Structure of a C Program

Every C program begins execution in the main() function. Preprocessor directives like #include <stdio.h> import standard I/O library functions.

#include <stdio.h>

int main() {
    printf("Hello from FreeOnlineGDB!\\n");
    return 0;
}

Handling User Input in C

Use scanf() to read values from standard input. In our compiler, switch to the Input (stdin) tab and enter your input before clicking Run Code.

int number;
printf("Enter an integer: ");
scanf("%d", &number);
printf("You entered: %d\\n", number);