C Comments

Comments are notes written inside the code for humans. The compiler ignores them. We use comments to explain what the code does, or to stop one line from running for a while.

Single line comment

It starts with // and goes until the end of the line.

#include <stdio.h>

int main(void) {
    // This line is a comment
    printf("Hello\n");   // comment after a statement
    return 0;
}

Output:

Multi line comment

It starts with /* and ends with */. It can be on many lines.

#include <stdio.h>

/* This program prints a message.
   Written for the C tutorial. */
int main(void) {
    printf("Learning C\n");
    return 0;
}

Output:

Comment out a line of code

#include <stdio.h>

int main(void) {
    printf("First\n");
    // printf("Second\n");
    printf("Third\n");
    return 0;
}

Output:

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