C program to find grade of a student

C program to find grade of a student 

 A student's grade is calculated in a subject according to the understated rules. Write  a  program  which  accepts  a  student's  number  as  input  and then  determine the grade  of the students in that subject.

C program to find grade of a student 

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#include<stdio.h>
void main()
{int m;
printf("Enter your marks");
scanf("%d",&m);
if(m>=90&&m<=100)
printf("Your grade is O");
else if(m>=80&&m<90)
printf("Your grade is E");
else if(m>=70&&m<80)
printf("Your grade is A");
else if(m>=50&&m<60)
printf("Your grade is C");
else if(m>=40&&m<50)
printf("Your grade is D");
else if(m<40&&m>=0)
printf("Your grade is F. YOU FAILED!!");
else
printf("Invalid Input");
}

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Just copy and paste the program in your desired compiler (Dev C++ is more preferable) and run it.

Enjoy programming in C.