Friday, October 23, 2015

C program to convert given upper case letters to lower case

//C program to convert given upper case letters to lower case.

#include<stdio.h>
#include<string.h>
int main()
{
  char str1[10]="ABCD";
int i;
for(i=0; i<4; i++)
{
printf("%c",str1[i]+32);
}
  return 0;
}

Output of the program:
abcd


Friday, October 9, 2015

C program to demonstrate use of Username and Password (login id password) functionality.



#include<stdio.h>
int main()
{
int i;
char ch1, username[10], password[10];

printf("Enter your Username:");

gets(username);

printf("Enter your Password:");
gets(password);

if(strcmp(username,"student")==0 && strcmp(password,"guest")==0)
printf("\n Welcome....\n MENU...Main Logic of Program..");
else
printf("Invalid Username/Password.");
 return 0;
}

Output of Program

Enter your Username:student
Enter your Password:guest

 Welcome....

 MENU...Main Logic of Program..

Pattern : C program to print Hollow Square for given value N.

#include<stdio.h>
int main()
{
int i,j,n=5;
//for loop to print line 1
for(i=0; i<n;i++)
{
printf("* ");
}
printf("\n");

// logic for repeating line 2 to 4, n-2 times
for(j=0; j<n-2; j++)
{
//for loop to print *    * line 2 to 4
printf("* ");

for(i=0; i<n-2; i++)
printf("  ");

printf("*\n");
}
for(i=0; i<n;i++)
{
printf("* ");
}
return 0;
}

Output of the program

* * * * *
*       *
*       *
*       *
* * * * *


Pattern : C program to print Square pattern based on given value N.

// C program to print Square pattern based on given value of N.

#include<stdio.h>
int main()
{
int i,j, n=5;
//Logic to print square based on given value of N...

for(i=0; i<n; i++)
{
for(j=0; j<n; j++)
printf("* "); //one space in printf prints proper output
printf("\n");
}
return 0;
}

Output of the program

* * * * *
* * * * *
* * * * *
* * * * *
* * * * *