String Basic lecture 02

#include<stdio.h>

int main()
{
    ///Declaration
    char s1[20]; // just declare the char array. Currently, in each position of the array is in garbadge value.

    printf("In declaration: \n");

    printf("Before input values in character array are: \n");
    for(int i = 0; i<20; i++) printf("%d\n", s1[i]);
    printf("\n.......................\n\n");
    // Here we print the array. we'll notice that every postion will be set garbadge. Here we print the ASCII value of each character.

    /// note that, if we declare char s1[20] this globally, every position of the array will be initialized with Null (means 0 in integer).

    printf("Enter a string as a word: ");
    scanf("%s", s1);
    // %s can take only a word as an input.
    // If we want to take whole line (including space), We must use "gets()". Syntax: gets(s1);
    // both %s and gets() initialize the array upto the characters you've entered from keyboard.

    printf("After input values in character array are: \n");
    for(int i = 0; i<20; i++) printf("%d\n", s1[i]);
    printf("\n.......................\n\n");
    // let's say, you've entered "MIST" as an input.
    // It will take 4 position (from 0 to 3) in that char array. Rest of the positions willa remain garbadge.

    printf("You entered: %s /// printed using printf()\n", s1);
    puts(s1); /// printed using puts()
    printf("\n.......................\n\n");
    // printf("%s",s); and puts(s); both print the character array up to Null characher ('\0').

    ///Definition
    char s2[20] = "MIST";
    // Here declare a char array and Initialize it's first 4 positions (0 to 3)

    printf("In definition values in character array are: \n");
    for(int i = 0; i<20; i++) printf("%d\n", s2[i]);
    printf("\n.......................\n\n");
    // Here we print the array.
    // We will notice that, rest of the positions (4 to 19) will be set NULL (means 0 in integer).

    puts(s2);

    return 0;
}