Answer:
// code to read grade 
#include <stdio.h>
// main function
int main(void) {
 // if grade is character
 char grade;
 // if grade is numeric then we can use int or double
 // int grade;
 // double grade;
 printf("Enter your grade:");
 // read grade from user
 scanf("%c",&grade);
 // print grade
 printf("your grade is:%c",grade);
 return 0;
}
Step-by-step explanation:
To read a value, scanf() function is used from stdio.h.Read a grade from user and assign it to variable "grade".
Output:
Enter your grade:A
your grade is:A
// code to read die volt
#include <stdio.h>
// main function
int main(void) {
// variable
 double die_volt;
 printf("Enter die volt:");
 // read die volt from user
 scanf("%lf",&die_volt);
 // print die volt
 printf("Entered die volt is:%0.2lf",die_volt);
 return 0;
}
Step-by-step explanation:
Read the die volt from user and assign it to variable "die_volt" with the help 
of scanf() function.
Output:
Enter die volt:220 
Entered die volt is:220.00