Description

Code comments are non-executable instructions that programmers can use to provide documentation. Single-line comments describe a single line in code.

Program comments can be placed anywhere.

  1. A single line Comment can be placed anywhere in the program.
  2. Comments lines start with '//'
  3. Compilers ignore symbols written after '//'.

Multi-line Comment

  1. Anywhere can be used for a multi-line comment.
  2. Multi-line comments starts with '/*' and ends with '*/'.
  3. Any symbols written between '/*' and '*/' are ignored by Compiler.
  4. Multiple lines can be user.

Method 1: 

// Online C compiler to run C program online
#include <stdio.h>
int main() {
    
    char comment[50];
    int i = 2, a = 0;
    
    printf("Enter Comment : ");
    gets(comment);
    if(comment[0] == '/'){
        if(comment[1] == '/'){
            printf("This is Single Line Comment.");
        }
        else if(comment[1] == '*'){
            for(i = 2; i <= 50; i++){
                if(comment[i]=='*' && comment[i + 1] == '/'){
                    printf("This is Multi Line Comment.");
                    a = 1;
                    break;
                }
                else{
                    continue;
                }
            }
            if(a == 0){
                printf("It is not a comment");
            }
        }
        else{
            printf("It is not a comment");
        }
    }
    else{
        printf("It is not a comment");
    }
    
    return 0;
}

Method 2:

#include<stdio.h>
#include<string.h>

void main(){
    char com[30];
    int len;
    printf("\nEnter Comment : ");
    gets(com);
    len = strlen(com);
    if(com[0] == '/' && com[1] == '/'){
        printf("It is a Single Line Comment");
    }
    else if(com[0] == '/' && com[1] == '*' && com[len - 1] == '/' && com[len - 2] == '*' ){
        printf("It is a Multi Line Comment");
    }
    else{
        printf("It is not a comment");
    }
}

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