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if marks are between 80 and 100, grade is computed as 'a'
if marks are between 70 and 79, grade is computed as 'b'
if marks are between 60 and 69, grade is computed as 'c'
if marks are between 0 and 59, grade is computed as 'd'

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//program to compute grade of a student based on marks using if else statement #include<iostream.h> #include<conio.h> void main() { int marks; char grade; clrscr(); cout<<"enter marks"; cin>>marks; if((marks>=80) &&(marks<=100)) { grade='a'; } else if((marks>=70) && (marks<80)) { grade='b'; } else if((marks>=60) && (marks<70)) { grade='c'; } else { grade='d'; } cout<<"grade obtained by the student is "<<grade; getch(); }