SIMPLE CALCULATOR

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
char opr;
int a,b;
float result=0;
clrscr();
printf("Enter the first number:");
scanf("%d",&a);
printf("Enter the second number:");
scanf("%d",&b);
printf("Enter the operator:");
scanf("%s",&opr);
switch(opr)
{
case'+':
result=a+b;
break;
case'-':
result=a-b;
break; 
case'*':
result=a*b;
break; 
case'/':
result=a/b;
break; 
case'%':
result=a%b;
break;
default:
printf("You are entered a invalid operator");
break;
}
printf("The result of %d %c %d is= %f",a,opr,b,result);
getch();
}

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TO CHECK GIVEN NUMBER IS PALINDROME OR NOT

#include<stdio.h>
#include<conio.h>
void main()
{
int num,sum=0,r,temp;
clrscr();
printf("Enter the number:");
scanf("%d",&num);
temp=num;
while(num)
{
r=num%10;
num=num/10;
sum=sum*10+r;
}
if(temp==sum)
printf("The given number is palindrome");

else

printf("The given number not palindrome");
getch();
}

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MEAN AND STANDARD DEVIATION

#include<stdio.h> 
#include<conio.h>
#include<math.h> 
void main()
{
int n,a[25],i;
float sum=0,sos=0,q,m,sd;
clrscr();
printf("Enter the total number of elements:");
scanf("%d",&n);
printf("Enter the elements");
for(i=1;i<=n;i++)
{
scanf("%d",&a[i]);
sum=sum+a[i];
sos=sos+a[i]*a[i];
}
m=sum/n;
q=sos/n;
sd=sqrt(q-m*m);
printf("The mean of given numbers is=%f",m);
printf("Standard deviation is =%f",sd);
getch();
}

Algorithm:

1.Start.

2.Read n.

3.assign i=1,sum=0,sos=0

4.If i<=n goto step5 else goto step9.

5.Read a[i]

6.Compute sum=sum+a[i]

7.Compute sos=sos+a[i]*a[i]

8.Assign i=i+1 goto step4.

9.compute m=sum/n

10.Compute q=sos/n

11.Compute sd=sqrt(q-m*n)

12.Print m,sd

13.Stop

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