app

calender
=========================
#include<stdio.h>

#define TRUE    1
#define FALSE   0




int days_in_month[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
char *months[]=
{
    " ",
    "\n\n\nJanuary",
    "\n\n\nFebruary",
    "\n\n\nMarch",
    "\n\n\nApril",
    "\n\n\nMay",
    "\n\n\nJune",
    "\n\n\nJuly",
    "\n\n\nAugust",
    "\n\n\nSeptember",
    "\n\n\nOctober",
    "\n\n\nNovember",
    "\n\n\nDecember"
};


int inputyear()
{
    int year;

    printf("Please enter a year you want to see the calendar for (example: 2015) : ");
    scanf("%d", &year);
    return year;
}


int determinedaycode(int year)
{
    int daycode;
    int d1, d2, d3;

    d1 = (year - 1.)/ 4.0;
    d2 = (year - 1.)/ 100.;
    d3 = (year - 1.)/ 400.;
    daycode = (year + d1 - d2 + d3) %7;
    return daycode;
}


int determineleapyear(int year){
    if(year% 4 == FALSE && year%100 != FALSE || year%400 == FALSE)
    {
        days_in_month[2] = 29;
        return TRUE;
    }
    else
    {
        days_in_month[2] = 28;
        return FALSE;
    }
}

calendar(int year, int daycode){

    int month, day;

    for ( month = 1; month <= 12; month++ )
    {
        printf("%s", months[month]);
        printf("\n\nSun  Mon  Tue  Wed  Thu  Fri  Sat\n" );


        for ( day = 1; day <= 1 + daycode * 5; day++ )
        {
            printf(" ");
        }


        for ( day = 1; day <= days_in_month[month]; day++ )
        {
            printf("%2d", day );


            if ( ( day + daycode ) % 7 > 0 )
                printf("   " );
            else
                printf("\n " );
        }

            daycode = ( daycode + days_in_month[month] ) % 7;
    }
}


int main()
{
    int year, daycode, leapyear;

    year = inputyear();
    daycode = determinedaycode(year);
    determineleapyear(year);
    calendar(year, daycode);
    printf("\n");



}
















calculator
=======================
#include<stdio.h>


int sum(int a,int b){int sum=a+b;
return sum;
}
int sub(int a,int b){
int sub=a-b;
return sub;
}
int mul(int a,int b){
int mul=a*b;
return mul;
}
int div(int a,int b){
int div=a/b;
return div;
}
int mod(int a,int b){
int mod=a%b;
return mod;
}
int sqrr(int a){
int sqrr=a*a;
return sqrr;
}
double squareroot(int a){
double squareroot= sqrt(a);
return squareroot;
}

int main(){
    float x,y,s,su,m,d,r,sq,sqr,q,v;
    do{
    printf("Calculate something: \n1=+\n2=-\n3=*\n4=/\n5=%%\n6=square\n7=square root\n");
    scanf("%f",&q);
    printf("Enter your number :\n");
    scanf("%f",&x);
    if(q==1||q==2||q==3||q==4||q==5){
    printf("Enter your second number :\n");
    scanf("%f",&y);
    }

    if(q==1){
        s=sum(x,y);
        printf("Sum is : %.2f\n",s);
    }else if(q==2){
        su=sub(x,y);
        printf("Sub is : %.2f\n",su);
    }else if(q==3){
        m=mul(x,y);
        printf("mul is : %.2f\n",m);
    }else if(q==4){
        d=div(x,y);
        printf("Div is :%.2f\n",d);
    }else if(q==5){
        r=mod(x,y);
        printf("Remainder is : %.2f\n",r);
    }


    if(q==6){
        sq=sqrr(x);
        printf("Square is : %f\n",sq);
    }else if(q==7){
        sqr=squareroot(x);
        printf("Square root is : %f\n",sqr);
    }

    printf("want to calculate again?\n press 1 for yes and 2 for no");
    scanf("%f",&v);
    }
    while(v==1);

    return 0;
}

















countdown timer
==============================

#include <stdio.h>
#include <time.h>

int sec_wait ( int sec ) {


        clock_t wait_till_end;




        wait_till_end = clock () + sec * CLOCKS_PER_SEC ;



        while (clock() < wait_till_end) {}



}



int main () {
        int i;
        printf ("Starting countdown...\n");
        for (i=60; i>0; i--) {
                 printf ("%d\n",i);
                 sec_wait (1);
                 if ( i == 3 )
                        printf ("Engine started...\n");
        }
       printf ("and lift off....\n");
       return 0;
}