else if to switch possible ?

hello friends,

I want to replace else if with switch statement here

Code:

---

#include <stdio.h>#include <stdlib.h>


int main()
{


    float grade1;
    float grade2;
    float grade3;


  printf("Enter your 3  test grades \n");
  scanf(" %f" ,&grade1);
  scanf(" %f" ,&grade2);
  scanf(" %f" ,&grade3);


  float avg =(grade1 +grade2 + grade3 ) / 3 ;


  printf("Average : %.2f \n" ,avg);


 if (avg>=90){


    printf("You are Excellent in studies\n");
  } else if (avg>=80){


    printf("You are great in studies\n");
  } else if (avg>=70){


    printf("You are good in studies\n");
  }else if (avg>=60){


    printf("You are average in studies\n");
  }else{


    printf("You need to improve in studies\n");
  }




    return 0;
}

---

hows that possible ?

You cannot use a switch in C for this as the switch's case values must be integers. Even if you were dealing with an integer range rather than a float range, the if-else chain would still be better than exhaustively listing all the integers in each range.

In this particular case, where you can reduce the average to a smaller range...

Code:

---

int range = avg / 10;
switch ( range ) {
  case 9:
    printf("You are Excellent in studies\n");
    break;
  case 8:
    printf("You are great in studies\n");
    break;
  case 7:
    printf("You are good in studies\n");
    break;
  case 6:
    printf("You are average in studies\n");
    break;
  default:
    printf("You need to improve in studies\n");
    break;
}

---

In this case you can avoid if..else of switch entirely (but it is a little bit confusing to someone else to read the code):

Code:

---

// test.c
#include <stdio.h>

int main ( void )
{
  static const char * const msgs[] = { "improve", "average", "good", "great", "excellent" };
  double a;
  int g, offset;

  // get the avarage from keyboard...
  scanf( "%lf", &a );

  g =  ( a >= 90.0 );
  g += ( a >= 80.0 );
  g += ( a >= 70.0 );
  g += ( a >= 60.0 );

  printf ( "%g: %s\n", a, msgs[g] );
}

---

Compiling and running:

Code:

---

$ cc -o test test.c
$ ./test <<< 10
10: improve
$ ./test <<< 62
62: average
$ ./test <<< 73
73: good
$ ./test <<< 81
81: great
$ <<< 99
99: excellent

---

Salem beat me to it!... By about 7 hours! Haha