Answer Posted / neeru bansal

/*Question 2 . Accept any two numbers from the user.
Perform the following operations on it using functions:
1. Addition
2. Subtraction
3. Multiplication
4. Swap the values
5. Print both the numbers in reverse order for example (if a
given number is 234, it should
be printed as 432)
CONCEPT : Using SWITCH statement and functions
SYNTAX : switch
{
case 1: statements;
Break;
case 2: statements;
Break;
…
default: statements;
}
*/

// Declaration for the preprocessor::
#include
#include
// Main function begins::
void main()
{
// Declaration of variables::
int a,b,c,t,n,num;
long int i;
int l;
char ch;
// Declaration of functions::
char num_status(int);
void sum(int,int);
void sub(int,int);
void mul(int,int);
void swap(int,int);
int reverse(int);
// To clear the screen before printing ::
clrscr();
// Printing SCDL student details for code-authentication::
printf(“\n***************************************\n NAME :
PRIYANKA”);
printf(“\n COURSE: PGDIT [1st Sem.]“);
printf(“\n REGISTRATION NUMBER: 200705826″);
printf(“\n SUBJECT: Assignment for C Programming
\n***************************************”);
// printing the directions for user to select::
printf(“\n\nPerform the following operations:\n”);
printf(“\n1.Addition:\n”);
printf(“\n2.Subtration:\n”);
printf(“\n3.Multiplication:\n”);
printf(“\n4.Swap the values:\n”);
printf(“\n5.Print the numbers in reverse order:”);
printf(“\n\nSlect your operation:\n”);
scanf(“%d”,&l);// accepts the operation choice
ch=num_status(l);// calling function for selectiong choice

//switch statement for the calculation
switch(ch)
{
case ’1′:
printf(“Enter the first number:\t”);
scanf(“%d”,&a);
printf(“Enter the second number:\t”);
scanf(“%d”,&b);
sum(a,b);
break;

case ’2′:
printf(“Enter the first number:\t”);
scanf(“%d”,&a);
printf(“Enter the second number:\t”);
scanf(“%d”,&b);
sub(a,b);
break;

case ’3′:
printf(“Enter the first number:\t”);
scanf(“%d”,&a);
printf(“Enter the second number:\t”);
scanf(“%d”,&b);
mul(a,b);
break;

case ’4′:
printf(“Enter the first number:\t”);
scanf(“%d”,&a);
printf(“Enter the second number:\t”);
scanf(“%d”,&b);
swap(a,b);
break;

case ’5′:
printf(“Enter the first number:\t”);
scanf(“%d”,&a);
printf(“The reverse of %d is %d”,a,reverse(a));
printf(“\nEnter the second number:\t”);
scanf(“%d”,&b);
printf(“The reverse of %d is %d”,b,reverse(b));
break;
}
getch();
}
// Function definition for selecting choice::
char num_status(int l)
{
if(l==1)
return ’1′;
else if(l==2)
return ’2′;
else if(l==3)
return ’3′;
else if(l==4)
return ’4′;

else
return ’5′;
}
// Function definition for addition of 2 numbers::
void sum(int a,int b)
{
int c;
c=a+b;
printf(“Addition of 2 numbers:\n a=%d\t b=%d\n c=%d\n”,a,b,c);
}
// Function definition for subtraction of 2 numbers::
void sub(int a,int b)
{
int c;
c=a-b;
printf(“Subtraction of 2 numbers:\n a=%d\t b=%d\n
c=%d\n”,a,b,c);
}
// Function definition for multiplication of 2 numbers::
void mul(int a,int b)
{
int c;
c=a*b;
printf(“Multiplication of 2 numbers:\n a=%d\n b=%d\n
c=%d\n\t\t “,a,b,c);
}
// Function definition for swapping of 2 numbers::
void swap(int a,int b)
{
int t;
t=a;
a=b;
b=t;
printf(“After swapping 2numbers:\n a=%d\n b=%d\n”,a,b,t);
}
// Function definition for reversing 2 numbers::
int reverse(int n)
{
int r,rev;
rev=0;
while(n!=0)
{
r=n%10;
n=n/10;
rev=rev*10+r;
}
return rev;
}

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