Dear Student,
here i have written the C program to demonstrate you the if structure in long form, short.And using switch keyword.
Note: Please note that the below program has been tested on ubuntu 16.04 system and compiled under gcc compiler. This code will also work on other IDE’s and C++ microsoft visual studio express.
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Program: 2: How can you write the multiple-alternative selection structure using the longer form of the if statement?
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//Hedaer file declration
#include<stdio.h>
//start of main function
int main()
{
float price;
int ID;
printf(“Enter Id: “);
scanf(“%d”, &ID);
//if ID is 1
if(ID == 1)
{
price = 50.55;
}
//if ID is either 2 or 9
if(ID == 2 )
{
price = 12.35;
}
if(ID == 9)
{
price = 12.35;
}
//if ID is either 5, 7 or 11
if(ID == 5 )
{
price = 11.46;
}
if(ID == 7 )
{
price = 11.46;
}
if(ID == 11 )
{
price = 11.46;
}
//else
else
{
price = -1;
}
//if price == -1
if(price)
{
printf(“Price is %lfn”, price);
}
else
{
printf(“Invalid IDn”);
}
return 0;
}
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Output:
//Hedaer file declration
#include<stdio.h>
//start of main function
int main()
{
float price;
int ID;
printf(“Enter Id: “);
scanf(“%d”, &ID);
//if ID is 1
if(ID == 1)
{
price = 50.55;
}
//if ID is either 2 or 9
if(ID == 2 )
{
price = 12.35;
}
if(ID == 9)
{
price = 12.35;
}
//if ID is either 5, 7 or 11
if(ID == 5 )
{
price = 11.46;
}
if(ID == 7 )
{
price = 11.46;
}
if(ID == 11 )
{
price = 11.46;
}
//if price == -1
if(price)
{
printf(“Price is %lfn”, price);
}
else
{
printf(“Invalid IDn”);
}
return 0;
}
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Program: 3: How can you write the multiple-alternative selection structure using the shorter form of the if statement?
————————————————————————————————————————————-
//Hedaer file declration
#include<stdio.h>
//start of main function
int main()
{
float price;
int ID;
printf(“Enter Id: “);
scanf(“%d”, &ID);
//if ID is 1
if(ID == 1)
{
price = 50.55;
}
//if ID is either 2 or 9
if(ID == 2 | ID == 9)
{
price = 12.35;
}
//if ID is either 5, 7 or 11
if(ID == 5 | ID == 7 | ID == 11)
{
price = 11.46;
}
//else
else
{
price = -1;
}
//if price == -1
if(price)
{
printf(“Price is %lfn”, price);
}
else
{
printf(“Invalid IDn”);
}
return 0;
}
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here is the sample run of the program:
Output: 2
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Program: 3: How can you write the multiple-alternative selection structure using the switch statement?
——————————————————————————————————————————————
//Hedaer file declration
#include<stdio.h>
//start of main function
int main()
{
float price;
int ID;
printf(“Enter Id: “);
scanf(“%d”, &ID);
//switch to case as per the input
switch(ID)
{
case 1:
price = 50.55;
printf(“Price is: %lfn”, price);
break;
//if ID is either 2 or 9
case 2:
case 9:
price = 12.35;
printf(“Price is: %lfn”, price);
break;
//if ID is either 5, 7 or 11
case 5:
case 7:
case 11:
price = 11.46;
printf(“Price is: %lfn”, price);
break;
case -1:
printf(“Invalid ID.n”);
break;
}
return 0;
}
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here is the sample run of the program:
Output: 3
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Answer : 5
What changes would you need to make to the code from Question 4 so that each case clause displays the appropriate price and the default clause displays the invalid id “Invalid ID” message
Just add this statement in the last default case:
change these lines
case -1:
printf(“Invalid ID.n”);
break;
to
default:
printf(“Invalid ID.n”);
break;
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