intmain() { intgrade; charlevel; scanf("%d",&grade); if(grade>=70) { level='C'; if(grade>=80) { level='B'; if(grade>=90) { level='A'; } } } else { if(grade>=60) { level='D'; } else { level='E'; } } printf("%c",level); return0; } 1. 2. 3. 4. 5....