Question

Write code in C to demo how to test the content of a variable and do some action accordingly.
Add a one line comment above the code to explain the code. Here is an example:
/* the following code checks if variable x is divisible by variable y and displays a message accordingly */
int x,y;
printf( "Enter two numbers \n" );
scanf("%d %d",&x,&y);
if (x % y ==0) { // use == to test for equality % returns remainder of dividing x by y could remove ==0 (How)?
printf(" Divisible "); }
else
  printf("Not Divisible "); }

Then, write the code using switch statements.

Answer 1

Note: for the ‘how?’ part in given example code, we can get rid of ==0 from if statement. In C if you simply use x%y in conditions instead of x%y==0, x%y evaluates to true, if it yields a non zero value, and false if it yields a zero value. So we might need to swap the messages being printed. So it should be like below if you are planning to get rid of ==0

if(x%y){

                printf("Not Divisible\n");

}else{

                printf("Divisible\n");

}

Following the given example code’s footsteps, the below code refers to a simple program that accepts a letter grade from user, and display a proper remarks for that grade after analyzing the grade. Let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

int main(){

                char grade;

                //prompting and getting a letter grade

                printf("Enter your grade (A/B/C/D/F) : ");

                scanf("%c",&grade);

                //the below code displays the proper remarks for a given grade

                if(grade=='A'){

                                printf("Outstanding\n");

                }else if(grade=='B'){

                                printf("Good\n");

                }else if(grade=='C'){

                                printf("Average\n");

                }else if(grade=='D'){

                                printf("Satisfactory\n");

                }else if(grade=='F'){

                                printf("Failed\n");

                }else{

                                //anything other than A/B/C/D/F

                                printf("That is an invalid grade\n");

                }

                return 0;

}

Below is the same program, using switch statements

#include<stdio.h>

int main(){

                char grade;

                //prompting and getting a letter grade

                printf("Enter your grade (A/B/C/D/F) : ");

                scanf("%c",&grade);

                //the below code displays the proper remarks for a given grade

                switch(grade){

                                case 'A':

                                               printf("Outstanding\n");

                                               break;

                                case 'B':

                                               printf("Good\n");

                                               break;

                                case 'C':

                                               printf("Average\n");

                                               break;

                                case 'D':

                                               printf("Satisfactory\n");

                                               break;

                                case 'F':

                                               printf("Failed\n");

                                               break;

                                default:

                                               //anything other than A/B/C/D/F

                                               printf("That is an invalid grade\n");

                }

               

                return 0;

}