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  JavaScript syntax // How to create variables: var  x; let  y; // How to use variables: x =  5 ; y =  6 ; let  z = x + y; The two most important syntax rules for fixed values are: 1.  Numbers  are written with or without decimals: 10.50 1001 2. Strings are text, written within double or single quotes: example: "John Doe" 'John Doe' JavaScript Variables In a programming language,  variables  are used to  store  data values. JavaScript uses the keywords  var ,  let  and  const  to  declare  variables. An  equal sign  is used to  assign values  to variables. In this example, x is defined as a variable. Then, x is assigned (given) the value 6: example : let  x; x =  6 ; JavaScript Operators JavaScript uses arithmetic operators ( + - * / ) to compute values: example : JavaScript uses an assignment operator ( = ) to assign values to variables: example : let  x, y;...

JavaScript Statements JavaScript statements are composed of: Values, Operators, Expressions, Keywords, and Comments. This statement tells the browser to write "Hello Dolly." inside an HTML element with id="demo":   let  x, y, z;     // Statement 1 x =  5 ;           // Statement 2 y =  6 ;           // Statement 3 z = x + y;       // Statement 4 Semicolons separate JavaScript statements. Add a semicolon at the end of each executable statement: let  a, b, c;   // Declare 3 variables a =  5 ;         // Assign the value 5 to a b =  6 ;         // Assign the value 6 to b c = a + b;     // Assign the sum of a and b to c

The JavaScript language Here we learn JavaScript, starting from scratch and go on to advanced concepts like OOP. We concentrate on the language itself here, with the minimum of environment-specific notes

Python Program to Find the Factorial of a Number  # Python program to find the factorial of a number provided by the user. # change the value for a different result num = 7 # uncomment to take input from the user #num = int(input("Enter a number: ")) factorial = 1 # check if the number is negative, positive or zero if num < 0:    print("Sorry, factorial does not exist for negative numbers") elif num == 0:    print("The factorial of 0 is 1") else:    for i in range(1,num + 1):        factorial = factorial*i    print("The factorial of",num,"is",factorial)

Python Program to Print all Prime Numbers in an Interval  # Python program to display all the prime numbers within an interval # change the values of lower and upper for a different result lower = 800 upper = 1000 # uncomment the following lines to take input from the user #lower = int(input("Enter lower range: ")) #upper = int(input("Enter upper range: ")) print("Prime numbers between",lower,"and",upper,"are:") for num in range(lower,upper + 1):    # prime numbers are greater than 1    if num > 1:        for i in range(2,num):            if (num % i) == 0:                break        else:            print(num) output: Prime numbers between 800 and 1000 are: 809 811 821 823 827 829 839 853 857 859 863 877 881 883 887 907 ...

Python Program to Check Prime Number # Python program to check if the input number is prime or not num = 407 # take input from the user # num = int(input("Enter a number: ")) # prime numbers are greater than 1 if num > 1:    # check for factors    for i in range(2,num):        if (num % i) == 0:            print(num,"is not a prime number")            print(i,"times",num//i,"is",num)            break    else:        print(num,"is a prime number")        # if input number is less than # or equal to 1, it is not prime else:    print(num,"is not a prime number") output: 407 is not a prime number 11 times 37 is 407  In this program, variable num is checked if it's prime ...

Add Two Numbers Provided by The User # Store input numbers num1 = input ( 'Enter first number: ' ) num2 = input ( 'Enter second number: ' ) # Add two numbers sum = float ( num1 ) + float ( num2 ) # Display the sum print ( 'The sum of {0} and {1} is {2}' . format ( num1 , num2 , sum ))      output:   Enter first number: 1.5 Enter second number: 6.3 The sum of 1.5 and 6.3 is 7.8

Python Program to Add Two Numbers # This program adds two numbers num1 = 1.5 num2 = 6.3 # Add two numbers sum = float(num1) + float(num2) # Display the sum print('The sum of {0} and {1} is {2}'.format(num1, num2, sum))  output The sum of 1.5 and 6.3 is 7.8

Python Program to Print Hello world! # This program prints Hello, world! print('Hello, world!')

C Program to Multiply two Matrices by Passing Matrix to a Function #include <stdio.h> void enterData(int firstMatrix[][10], int secondMatrix[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond); void multiplyMatrices(int firstMatrix[][10], int secondMatrix[][10], int multResult[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond); void display(int mult[][10], int rowFirst, int columnSecond); int main() {     int firstMatrix[10][10], secondMatrix[10][10], mult[10][10], rowFirst, columnFirst, rowSecond, columnSecond, i, j, k;     printf("Enter rows and column for first matrix: ");     scanf("%d %d", &rowFirst, &columnFirst);     printf("Enter rows and column for second matrix: ");     scanf("%d %d", &rowSecond, &columnSecond);     // If colum of first matrix in not equal to row of second matrix, asking user to enter the size of matrix agai...

C Program to Write a Sentence to a File #include <stdio.h> #include <stdlib.h>  /* For exit() function */ int main() {    char sentence[1000];    FILE *fptr;    fptr = fopen("program.txt", "w");    if(fptr == NULL)    {       printf("Error!");       exit(1);    }       printf("Enter a sentence:\n");    gets(sentence);    fprintf(fptr,"%s", sentence);    fclose(fptr);    return 0; }  

C Program to Display its own Source Code as Output #include <stdio.h> int main() {     FILE *fp;     char c;     fp = fopen(__FILE__,"r");     do {          c = getc(fp);          putchar(c);     }     while(c != EOF);     fclose(fp);     return 0; }

Program to Display English Alphabets in Uppercase and Lowercase #include <stdio.h> int main() {     char c;     printf("Enter u to display alphabets in uppercase. And enter l to display alphabets in lowercase: ");     scanf("%c", &c);     if(c== 'U' || c== 'u')     {        for(c = 'A'; c <= 'Z'; ++c)          printf("%c ", c);     }     else if (c == 'L' || c == 'l')     {         for(c = 'a'; c <= 'z'; ++c)          printf("%c ", c);     }     else        printf("Error! You entered invalid character.");     return 0; }

C Program to Display Characters from A to Z Using Loop  #include <stdio.h> int main() {     char c;     for(c = 'A'; c <= 'Z'; ++c)        printf("%c ", c);        return 0; }

C Program to Find the Frequency of Characters in a String #include <stdio.h> int main() {    char str[1000], ch;    int i, frequency = 0;    printf("Enter a string: ");    gets(str);    printf("Enter a character to find the frequency: ");    scanf("%c",&ch);    for(i = 0; str[i] != '\0'; ++i)    {        if(ch == str[i])            ++frequency;    }    printf("Frequency of %c = %d", ch, frequency);    return 0; }  Output Enter a string: This website is awesome. Enter a character to find the frequency: e Frequency of e = 4

C Program to Find the Length of a String #include <stdio.h> int main () { char s [ 1000 ], i ; printf ( "Enter a string: " ); scanf ( "%s" , s ); for ( i = 0 ; s [ i ] != '\0' ; ++ i ); printf ( "Length of string: %d" , i ); return 0 ; }  

C Program to Copy String Without Using strcpy() #include <stdio.h> int main () { char s1 [ 100 ], s2 [ 100 ], i ; printf ( "Enter string s1: " ); scanf ( "%s" , s1 ); for ( i = 0 ; s1 [ i ] != '\0' ; ++ i ) { s2 [ i ] = s1 [ i ]; } s2 [ i ] = '\0' ; printf ( "String s2: %s" , s2 ); return 0 ; }  

This program counts the number of bytes in a C source file. The program prompts the user for a file name and then concatenates the ".c" extension to this name. It uses the function getc to read the characters. #include<stdlib.h> #include<stdio.h> #include<string.h> main( ) { FILE* fptr; char extension[] = ".c"; char file_name[FILENAME_MAX]; /* defined in stdio.h*/ int char_count; printf("\n\n\tFile name (NO extension):\t"); scanf("%s",file_name); strcat(file_name,extension); fptr=fopen(file_name,"rb"); for(char_count=0; getc(fptr) !=EOF; ++char_count); printf("\n\tByte size:\t%d", char_count); fclose(fptr); return EXIT_SUCCESS; }

Invoke function without main in C Language. #include<stdio.h> #include<conio.h> #define FIRST   0 #define SECOND  1 #define THIRD   2 //Variables int a,b,c,ch; float d; //Function Prototype void Read(); void Operation(); void Display(); #pragma startup Read       0 //First_Priority #pragma startup Operation  1 //Second_Priority #pragma exit Display     //Third_Priority void main() {  printf(" Enter to main() ");  getch();  printf(" Exit From main() ");  getch(); } void Read() {  clrscr();  printf(" Enter the value of a : ");  scanf("%d",&a);  printf(" Enter the value of b : ");  scanf("%d",&b); } void Operation() {  printf(" ArithMetic Operations ");  printf("--------------------- ");  printf("1  -> Addition ");  printf("2  -> Subtraction ");  printf("3  -> Multiplication ");  printf("--...

Decimal to Binary, Octal and HEX converter. #include<stdio.h> #include<conio.h> #define MAX 79 #define ESC 27 void main() {          char res,r;          int i,k=0,y;          long j=0,l=0,o=0;          textcolor(15);          for(i=0;i<5000;i++)                   cprintf(" ");          while(1)          {                   clrscr();                   printf("Enter Any Number To Be Converted : ");                   scanf("%ld",&j);   ...