In C, comments are used to explain code and make it more readable — especially useful for documentation, debugging, or future you! ??

?? Types of Comments in C

? 1. Single-line Comment

Use // to comment everything after it on the same line.

c
int main() {    // This prints Hello, World!    printf("Hello, World!\n");    return 0;}

? 2. Multi-line Comment

Use /* ... */ to write comments over multiple lines.

c
#include <stdio.h>int main() {    /*      This is a multi-line comment.      You can explain complex logic here.    */    printf("Multi-line comment example\n");    return 0;}

?? Notes

• You can’t nest multi-line comments in C.

  c
  /* Outer comment   /* Inner comment */ // ? Not allowed!*/
  

• Comments are ignored by the compiler and have no effect on the actual program output.

? Best Practices

• Use comments to explain why, not just what.

• Don’t overuse — write clean, self-explanatory code.

• Keep comments up to date if code changes.