program to know a number is even or odd

//program to know a number is even or odd
#include<stdio.h>
#include<conio.h>
void main()
{
int x;
printf("enter a number\n");
scanf("%d",&x);
if(x%2==0)
{
printf("it is an even number");
}
else
{
printf("it is an odd number\n");
}
getch();
}

if-else programs collection

1) Write a program to know a number is even or odd.

                                                solution

2) Write a program to know a number is divisible by both 3 and 5 or not.

                                                 solution

3) Write program to know a number is positive or negative or zero.

                                                 solution

4)Write a program to know two numbers entered by you are same or not.

                                              solution

5) Write a program to get greatest number among three numbers.

                                                                                                   solution
6)Write a program to know a number entered by you lies between two values/range or not.

                                                                                                  solution
7)Write a program to get smallest number among three numbers.

                                                                                                 solution
8)Write a program to get sum or product or difference or quotient of two numbers using switch.


                                                                                             solution
9) Write a program to know a triangle is right angled or not.

                                                                                         solution

10) Write a program to know a triangle is equilateral or not.

                                                                                         solution
                                                                               
                                                                             
                                                              goto next section

Tutorial section of "C' language

click the unit given here to read that section thoroughly.

program to know ascii value

// program to know ascii value
#include<stdio.h>
#include<conio.h>
void main()
{
char a;
a=getchar();
printf("its ascii value=%d",a);
getch();
}

program to convert total seconds into hour,minutes and seconds

// program to convert total seconds into hour,minutes and seconds
#include<stdio.h> #include<conio.h> void main() { clrscr(); int total_seconds,hr,minutes,seconds; printf("enter total seconds \n"); scanf("%d",&total_seconds); hr=total_seconds/3600; // to get hour after dividing total seconds by 3600 printf("hours =%d\n",hr); hr=total_seconds%3600; // after getting hours, we have to get total left second minutes=hr/60; // to get total minutes printf("total minutes=%d\n",minutes); seconds=hr%60; // it gives total left seconds as seconds after getting months printf("the seconds=%d\n",seconds); getch(); }

note:

Here I have used same variable again and again. But I you want then you can use different variable

program to convert days into year ,month and days

// program to convert total days into year,month and days #include<stdio.h> #include<conio.h> void main() { clrscr(); int total_days,year,month,days; printf("enter total days \n"); scanf("%d",&total_days); year=total_days/365; // to get year after dividing total days by 365 printf("year =%d\n",year); year=total_days%365; // after getting years, we have to get total left days month=year/30; // to get total months printf("total months=%d\n",month); days=year%30; // it gives total left days as days after getting months printf("the days=%d\n",days); getch(); }

note:

Here I have used same variable again and again. But I you want then you can use different variable.

program to get values in of x in quadratic equation

//program to get values of x in quadratic equation
#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
float a,b,c,x1,x2;
printf("enter values of a,b and c\n");
scanf("%f%f%f",&a,&b,&c);
x1=(-b+sqrt(b*b-4*a*c))/2*a;
x2=(-b-sqrt(b*b-4*a*c))/2*a;
printf("the first value=%f\n",x1);
printf("second value is=%f",x2);
getch();
}

note:

according to formula the condition should be satisfied.like
1) (b²-4ac)>0 i.e. b²>4ac
2)a>0 for 2a
otherwise the program terminates abnormally without any result.
later we will see this program with 'if' structure'.

Logically that is said to be right.