c programming

1.Program to print "Hello C" using if and else statement both

2. Program to print source code as program output

3. C program to design Login Screen by validation username and password

4. Program to print weekday of given date

 

  

Solution:

1. #include <stdio.h>

int main()

{

    if(!printf("Hello "))

        ;

    else

        printf("C\n");

    return 0;

}

2#include <stdio.h>

int main()

{

    FILE *fp;

    char c;

    fp = fopen(__FILE__, "r");

    do

    {

        c=fgetc(fp);

        putchar(c);

    }

    while(c!=EOF);

    fclose(fp);

    return 0;

}